CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

DC/DC CONVERTER
▪
▪
▪
▪
▪
▪
▪
▪
▪
▪

24V DC-Input
Isolated 5Vdc output
Efficiency up to 81.5%
Width only 32mm
20% output power reserves (PowerBoost)
Full power between -25°C and +60°C
Soft-start function included
Minimal inrush current surge
Reverse input polarity protection
3 year warranty

PRODUCT DESCRIPTIONSHORT-FORM DATAThe Dimension CD-Series offer DIN rail DC/DC converters in the50-120W output power range in a very compact housing. These
DC/DC converters can also to run on a battery or similar sources.

Output voltage
Adjustment range
Output current

The CD5.051 converts 24Vdc on the input to 5Vdc at the output.
The device includes all the essential basic functions. The devices
also offer PowerBoost: Power reserves of 20%, which may evenbe used continuously at temperatures up to +45°C.
The output is electrically isolated from the input in a safe way.
The input is protected against reversed voltages and contains asoft start function.
CD5.051

24V->5V

Related products

CD5.121

24V->12V

24V->24V

CD5.243

12V->24V

CD5.242

48V->24V

CD-Series

CD5.241

CD5.241-L1
CD5.241-S1

24V->24V, NEC Class 2,
Spring-clamp-terminals,
24V->24V,
Spring-clamp-terminals,
Input-low, DC-OK signals

ORDER NUMBERS

PowerBoost

Output ripple
Input voltage
Input voltage range
Input current
Input inrush current
Efficiency
LossesTemperature range
Derating
Hold-up time
Dimensions
WeightDC 5V
Nominal5 – 5.5V
Factory setting 5.1V
10A
up to +60°C ambient
7.5A
at +70°C ambient
Derate linearly between +60°C and +70°C
12A
up to +45°C ambient
Linear decrease to nominal power between+45°C and +60°C< 50mVpp
20Hz to 20MHz
DC 24V
18.0 to 32.4Vdc
full power
14.4 to 18.0Vdc
with derating
typ. 2.6A
at 24Vdc input
typ. 1.2Apeak
81.5%
at 24Vdc input
11.5W
at 24Vdc input-25°C to +70°C
operational
1.25W/°C+60 to +70°C
typ. 10ms
at 24Vdc input
32x124x102mm
WxHxD
425g

MAIN APPROVALS

DC/DC Converter

CD5.051

Standard unit

Accessory

ZM10.WALL
ZM11.SIDE

Wall mount bracket
Side mount bracket

For details and the complete approval list, see chapter 17

UL 508

ATEX

IECEx

UL 60950-1

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

1/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

INDEX
Page
1. Intended Use ................................................................ 3
2. Installation Instructions ................................................ 3
3. Input Voltage ................................................................ 5
4. Soft-start and Input Inrush Current Surge .................... 6
5. Output .......................................................................... 7
6. Hold-up Time ................................................................ 8
7. Efficiency and Power Losses ......................................... 9
8. Functional Diagram .................................................... 10
9. Front Side and User Elements .................................... 10
10. Terminals and Wiring ................................................. 11
11. Lifetime Expectancy and MTBF .................................. 11
12. EMC ............................................................................ 12
13. Environment ............................................................... 13
14. Protection Features .................................................... 14
15. Safety Features........................................................... 14
16. Dielectric Strength ...................................................... 15
17. Approved, Fulfilled or Tested Standards .................... 16

Page
18. Regulatory Product Compliance ................................ 16
19. Physical Dimensions and Weight ............................... 17
20. Accessories................................................................. 18
20.1. ZM10.WALL Wall mounting bracket ............... 18
20.2. ZM11.SIDE Side mounting bracket ................. 19
21. Application Notes....................................................... 19
21.1. Back-feeding Loads .......................................... 19
21.2. Inductive and Capacitive Loads ........................ 19
21.3. External Input Protection ................................. 19
21.4. Requirements for the Supplying Source ........... 20
21.5. Parallel Use to Increase Output Power ............ 2121.6. Parallel Use for Redundancy ............................ 2121.7. Daisy Chaining of Outputs ................................ 2221.8. Use in a Tightly Sealed Enclosure ..................... 2221.9. Mounting Orientations ..................................... 23

The information presented in this document is believed to be accurate and reliable and may change without notice.
Some parts of this unit are patent by PULS (US patent No 091662,063, Des. 424,529, …).
No part of this document may be reproduced or utilized in any form without permission in writing from PULS GmbH.

TERMINOLOGY AND ABREVIATIONSPE andsymbolPE is the abbreviation for Protective Earth and has the same meaning as the symbol.

Earth, Ground

This document uses the term “earth” which is the same as the U.S. term “ground”.

t.b.d.

To be defined, value or description will follow later.

DC 24VA figure displayed with the AC or DC before the value represents a nominal voltage with standard tolerances
included.
E.g.: DC 12V describes a 12V battery disregarding whether it is full (13.7V) or flat (10V)24Vdc

A figure with the unit (Vdc) at the end is a momentary figure without any additional tolerances included.

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

2/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

1. INTENDED USEThis device is designed for installation in an enclosure and is intended for the general use such as in industrial control, office,communication, and instrumentation equipment.
Do not use this DC/DC converter in equipment where malfunction may cause severe personal injury or threaten human life.

2. INSTALLATION INSTRUCTIONSWARNING Risk of electrical shock, fire, personal injury or death.
- Do not use the DC/DC-converter without proper grounding (Protective Earth). Use the terminal on the input block for earth
connection and not one of the screws on the housing.
- Turn power off before working on the device. Protect against inadvertent re-powering.
- Make sure that the wiring is correct by following all local and national codes.
- Do not modify or repair the unit.
- Do not open the unit as high voltages may present inside.
- Use caution to prevent any foreign objects from entering the housing.
- Do not use in wet locations or in areas where moisture or condensation can be expected.
- Do not touch during power-on, and immediately after power-off. Hot surface may cause burns.
Obey the following installation instructions:This device may only be installed and put into operation by qualified personnel.
This device does not contain serviceable parts. The tripping of an internal fuse (if included) is caused by an internal defect.
If damage or malfunction should occur during installation or operation, immediately turn power off and send unit to the factory for
inspection.
Install device in an enclosure providing protection against electrical, mechanical and fire hazards.
Install the device onto a DIN rail according to EN 60715 with the input terminals on the bottom of the device. Other mounting
orientations require a reduction in output current.
Make sure that the wiring is correct by following all local and national codes. Use appropriate copper cables that are designed for aminimum operating temperature of 60°C for ambient temperatures up to+45°C, 75°C for ambient temperatures up to +60°C and 90°C
for ambient temperatures up to +70°C.
Ensure that all strands of a stranded wire enter the terminal connection. Unused screw terminals should be securely tightened.
The device is designed for pollution degree 2 areas in controlled environments. No condensation or frost is allowed.
The enclosure of the device provides a degree of protection of IP20. The enclosure does not provide protection against spilled liquids.
The isolation of the device is designed to withstand impulse voltages of 1.5kV according to IEC 60664-1.
The input can be powered from batteries or similar DC sources. The voltage between the input terminals and ground must not exceed
60Vdc continuously.
The input must be powered from a PELV or SELV source or an "Isolated Secondary Circuit" in order to maintain a SELV or PELV output.
Check for correct input polarity. The device will not operate when the voltage is reversed.
A disconnecting means shall be provided for the input of the device.
The device is designed as “Class of Protection III” equipment according to IEC 61140. A PE (ground)connection is not required. However,connecting the chassis ground terminal to ground can be beneficial to gain a high EMI immunity.
The device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do not cover ventilation
grid!
The device is designed for altitudes up to 5000m. Above 2000m a reduction in output current is required.
Keep the following minimum installation clearances: 40mm on top, 20mm on the bottom, 5mm left and right side. Increase the 5mm to15mm in case the adjacent device is a heat source. When the device is permanently loaded with less than 50%, the 5mm can be reduced
to zero.
The device is designed, tested and approved for branch circuits up to 50A without additional protection device. If an external fuse isutilized, do not use circuit breakers smaller than 10A B- or 8A Characteristic to avoid a nuisance tripping of the circuit breaker.
The maximum surrounding air temperature is +70°C. The operational temperature is the same as the ambient or surrounding air
temperature and is defined 2cm below the device.
The device is designed to operate in areas between 5% and 95% relative humidity.

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

3/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

Installation Instructions for Hazardous Location Areas
The device is suitable for use in Class I Division 2 Groups A, B, C, D locations and for use in Group II Category 3 (Zone 2) environments.
Classification: ATEX: EPS 08 ATEX 1 142 X, II 3G Ex ec nC IIC T4 Gc / IECEx EPS 14.0001X

WARNING EXPLOSION HAZARDS!
Substitution of components may impair suitability for this environment.
Do not disconnect the device or operate the voltage adjustment unless power has been switched off or the area is known to be nonhazardous.
A suitable enclosure must be provided for the end product which has a minimum protection of IP54 and fulfils the requirements of the
EN 60079-0.
Reduced output current conditions must be considered for high ambient temperatures and non-standard mounting

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

4/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

3. INPUT VOLTAGE
Input voltage
Input voltage rangenom.

DC 24V
18.0-32.4Vdc
14.4-18.0Vdc
36.0Vdc

max.
Allowed voltage between input andearth
Allowed input ripple voltage

max.
max.

60Vdc or42.2Vac
5Vpp

Turn-on voltage
Shut-down voltage

typ.
typ.
typ.

17.5Vdc
14.0Vdc
35.0Vdc

Input current
Start-up delay
Rise time

typ.
typ.
typ.
typ.
max.
typ.

2.6A
420ms
300ms
350ms
250mV
3 000µF

Turn-on overshootInput capacitancefull power, see Fig. 3-2 for derating below 18.0Vdc
max. 60s or with derating see Fig. 3-2
absolute maximum continuous input voltage with no damage to
the DC/DC converterin case the output voltage is not grounded.
47Hz-500Hz, the momentary input voltage must always be within
the specified limits
steady-state value, see Fig. 3-1
steady-state value, see Fig. 3-1
steady-state value, see Fig. 3-1
at 24Vdc input and output 5V, 10A, see Fig. 3-4
see Fig. 3-3
0mF, 5V, constant current load 10A, see Fig. 3-3
8mF, 5V, constant current load 10A, see Fig. 3-3
see Fig. 3-3
external capacitors on the input voltage bus are allowed without
any limitations

Fig. 3-2 Allowable output current below 18V input
voltageFig. 3-1 Input voltage range

Rated input range

Turn-onShut -dow n

POUT

32.4Vdc
35.0Vdc

17.5Vdc
18.0Vdc

14.0Vdc

VIN

Fig. 3-3 Turn-on behavior, definitions

Fig. 3-4 Input current vs. output load

OutputVoltage- 5%
Start-up
delay

Rise
Time

Overshoot

Input
Voltage

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

5/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

4. SOFT-START AND INPUT INRUSH CURRENT SURGE
Inrush current limitation
An active inrush limitation circuit (inrush limiting resistor which is bypassed by a relay contact) limits the input inrush current after turnon of the input voltage.
The charging current into EMI suppression capacitors is disregarded in the first microseconds after switch-on.
Inrush current

max.
typ.
typ.

Inrush energy

1.6Apeak
1.2Apeaknegligible-25°C to +70°C, input: 24Vdc-25°C to +70°C, input: 24Vdc-25°C to +70°C, input: 24Vdc

Fig. 4-1 Input inrush current, typical behavior

Input:
Output:Ambient:

24Vdc
5V, 10A, constant current load
25°C

Upper curve:
Middle curve:
Lower curve:Time basis:

Input current 2A/DIV
Input voltage 20V/DIV
Output voltage 5V/DIV
100ms/DIV

Soft-start function:
After the DC/DC converter is turned on, the internal output current rises slowly to its nominal value. This method charges the output
capacitors (internal and external capacitors) slowly and avoids high input currents during turn-on. High input currents can produce ahigh voltage drop on the input wiring (especially with long and thin cables) which reduces the terminal voltage on the DC/DC converter.
If the terminal voltage is below the shut-down voltage, the DC/DC converter will turn-off and will make a new start-up attempt. Thiseffect is avoided with the integrated soft-start function. Please note, that this function increases the rise time of the output voltage by asmall amount.
Fig. 4-2 Soft-start behavior

Input:
24Vdc
Output:5V, 10A, constant current load
Ambient:
25°C
No additional external output capacitors
Upper curve:
Lower curve:Time basis:

Input current 1A/DIV
Output voltage 2 /DIV
20ms/DIV

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

6/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

5. OUTPUT
Output voltage
Adjustment range

nom.

5V
5-5.5V
5.8V
5.1V
25mV
120mV
50mVppmax.
Factory settingLine regulation
Load regulation
Ripple and noise voltage
Output current

PowerBoost*)

Short-circuit current
Output capacitance

max.
max.
max.

guaranteed
at clockwise end position of potentiometer±0.2%, at full load, cold unit
Input voltage variations between 18 to 32.4Vdc
static value, 0A → 10A
20Hz to 20MHz, 50Ohm

nom.
10A
At 5V and up to +60°C ambient temperature, see Fig. 5-1
nom.
7.5A
At 5V and +70°C ambient temperaturenom.
10A
At 5.5V and up to +60°C ambient temperature, see Fig. 5-1
nom.
7.5A
At 5.5V and +70°C ambient temperature
Input voltage range 18.0 to 32.4Vdc: Derate linearly between +60°C and +70°C, see Fig. 13-1
Input voltage range 14.4 to 18.0Vdc: Derate linearly between +45°C and +70°C, see Fig. 3-2
nom.
12A
at 5.0V up to +45°C ambient, see Fig. 5-1
nom.
11A
at 5.5V up to +45°C ambient, see Fig. 5-1
PowerBoost decreases linearly to nominal power between +45°C and +60°C, see chapter 13min.
12A
continuous current, short circuit impedance 10mOhm
max.
20A
continuous current, short circuit impedance 10mOhm
typ.
16000µF*) PowerBoost
This power/ current is continuously allowed up to an ambient temperature of +45°C.
Above +45°C, do not use this power or current longer than a duty cycle of 10% and/or not longer than 1 minute every 10 minutes.

Fig. 5-1 Output voltage vs. output current at
24Vdc input voltage, typ.

Fig. 5-2 Current limitation vs. input voltage,(5V constant voltage load), typ.

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

7/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

6. HOLD-UP TIME
The input side of the DC/DC converter is equipped with a bulk capacitor which keeps the output voltage alive for a certain period of time
when the input voltage dips or is removed. The bulk capacitor can be discharged by loading the DC/DC converter on the output side or
through a load which is parallel to the input. There is no protection in the DC/DC converter which prevents current from flowing back to
the input terminals. If prevention is needed, an external diode should be used.
Hold-up Time

typ.
typ.

20ms
10ms

input 24Vdc, output: 5V, 5A, see Fig. 6-1
input 24Vdc, output: 5V, 10A, see Fig. 6-1

Fig. 6-1 Hold-up time vs. input voltage

Fig. 6-2 Shut-down test setup

S1

+
DC
Source-DC/DC
Converter
Input+

Fig. 6-3 Shut-down behavior, definitions

IntputVoltage

S1 opens

+

CD5

Load

Output --- 5%

OutputVoltage
Hold-up Time

Note: At no load, the hold-up time can be up to several seconds. The green DC-OK LED is also on during this time.

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

8/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

7. EFFICIENCY AND POWER LOSSES
Efficiency
Power losses

Input 24Vdc
81.5%
0.8W
5.5W
11.5W
14.5W

typ.
typ.
typ.
typ.
typ.

at 5.1V, 10A
at no output load
at 5.1V, 5A
at 5.1V, 10A
at 5.1V, 12A

Fig. 7-1

Efficiency vs. output current at 5.1V output
and 24Vdc input voltage, typ.

Fig. 7-2

Losses vs. output current at 5.1V output and
24Vdc input voltage, typ.

Fig. 7-3

Efficiency vs. input voltage at 5.1V, 10A, typ.

Fig. 7-4

Losses vs. input voltage at 5.1V, 10A, typ.

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

9/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

8. FUNCTIONAL DIAGRAM
Fig. 8-1 Functional diagram
OutputVoltage
Regulator+-

Input Fuse&
Input Filter

ChassisGroundReversePolarity
Protection&
InrushLimiter

OverTemperature
Protection

Power
Converter

OutputFilterOutputOverVoltage
Protection

VOUT

+
+
DC
ok

9. FRONT SIDE AND USER ELEMENTS
Fig. 9-1 Front sideA

Input terminals
Screw terminals+ Positive input- Negative (return) input
Chassis ground: can be used to bond the housing to PE
Ground this terminal to minimize high-frequency emissions.

B

Output terminals
Screw terminals, dual terminals per pole, both pins are equal+ Positive output- Negative (return) output

C

Output voltage potentiometer
Open the flap to set the output voltage. Factory set: 5.1V

D

DC-OK LED (green)
On when the voltage on the output terminals is > 2V

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

10/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

10. TERMINALS AND WIRINGType
Solid wire
Stranded wire
American Wire Gauge
Wire stripping length
Screwdriver
Recommended tightening torqueInput
screw terminals
max. 6mm2
max. 4mm2
20-10 AWG
7mm
3.5mm slotted or Pozidrive
No 2
1Nm

Outputscrew terminals
max. 6mm2
max. 4mm2
20-10 AWG
7mm
3.5mm slotted or Pozidrive
No 2
1Nm

Instructions:a) The external circuitry of all terminals must meet the safety requirements stipulated by IEC/EN/UL 60950-1: SELV.
b) Use appropriate copper cables that are designed for an operating temperature of:
60°C for ambient up to 45°C and
75°C for ambient up to 60°C minimum.
c) Follow national installation codes and installation regulations!
d) Ensure that all strands of a stranded wire enter the terminal connection!
e) Do not load the terminals with more than 25A! See chapter 21.7f) Screws of unused terminal compartments should be securely tightened.
g) Ferrules are allowed.
h) Do not connect or disconnect the wires from the terminals below -25°C.

11. LIFETIME EXPECTANCY AND MTBF
Lifetime expectancy *)MTBF **) SN 29500, IEC 61709
MTBF **) MIL HDBK 217F

Input 24Vdc
250 000h
99 000h55 000h
280 000h
1 161 000h
1 904 000h
610 000h
817 000h

at 5.1V, 5A and +40°C
at 5.1V, 10A and +40°C
at 5.1V, 12A and +40°C
at 5.1V, 10A and +25°C
at 5.1V, 10A and +40°C
at 5.1V, 10A and +25°C
at 5.1V, 10A and +40°C; Ground Benign GB40
at 5.1V, 10A and +25°C; Ground Benign GB25*)

The Lifetime expectancy shown in the table indicates the minimum operating hours (service life) and is determined by the lifetime expectancy of the built-in
electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated according to the capacitor’s manufacturer specification. The
prediction model allows only a calculation of up to 15 years from date of shipment.
**) MTBF stands for Mean Time Between Failures, which is calculated according to statistical device failures, and indicates reliability of a device. It is the statisticalrepresentation of the likelihood of a unit to fail and does not necessarily represent the life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h means that statistically one unit will failevery 100 hours if 10 000 units are installed in the field. However, it cannot be determined if the failed unit has been running for 50 000h or only for 100h.

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

11/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

12. EMCThe DC/DC converter is suitable for applications in industrial environment as well as in residential, commercial and light industry
environment.
The device complies with EN 61000-6-1, EN 61000-6-2, EN 61000-6-3, EN IEC 61000-6-8 and EN 61000-6-4.
No restrictions apply for DC power ports in industrial, light-industrial and commercial environments. For DC power ports in residential
environments no restrictions apply with a maximum DC output line length of 25 m.
EMC Immunity
Electrostatic discharge
Electromagnetic RF field
Fast transients (Burst)
Surge voltage on input

Surge voltage on output
Conducted disturbance

Generic standards: EN 61000-6-1 and EN 61000-6-2
EN 61000-4-2
Contact discharge
Air discharge
EN 61000-4-3
80MHz-6GHz
Input lines
EN 61000-4-4
Output lines
EN 61000-4-5+→+/- → chassis ground+/- → chassis groundEN 61000-4-5+→+ / - → chassis groundEN 61000-4-6
0.15-80MHz

8kV
15kV
10V/m
4kV
2kV
1kV
1kV
2kV
0,5kV
1kV
10V

Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion B
Criterion B
Criterion A
Criterion A

Criterions:
A: DC/DC converter shows normal operation behavior within the defined limits.
B: The DC/DC converter operates continuously during and after the test. During the test minor temporary impairments may occur, which will be corrected by
the device itself.
C: Temporary loss of function is possible. DC/DC converter may shut-down and restarts by itself. No damage or hazards for the DC/DC converter will occur.

EMC Emission
Conducted emission input lines

Generic standards: EN 61000-6-3 and EN 61000-6-4
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
EN IEC 61000-6-3 limits for DC power ports fulfilled
for a maximum DC output line length of 25 m.
EN IEC 61000-6-8 limits for DC power ports fulfilled
without restrictions
Radiated emission
EN 55011, EN 55032
Class B
This device complies with FCC Part 15 rules.
Operation is subjected to following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause undesired operation.

Switching frequency
Variable between 40kHz and 120kHz depending on load and input voltage(output current > 0.5A)

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

12/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

13. ENVIRONMENT
Operational temperature *)Storage temperature
Output derating-25°C to +70°C
reduce output power according Fig. 13-1
-40 to +85°C
for storage and transportation
1.25W/K
between +60°C and +70°C
Additional derating is required for input voltages below 18.0Vdc, see chapter 3
5 to 95% r.H.
IEC 60068-2-30
2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g
IEC 60068-2-6
2 hours / axis
30g 6ms, 20g 11ms
IEC 60068-2-27
3 bumps / direction, 18 bumps in total
0 to 6000m
reduce output power or ambient temperature above
2000m sea level.
6W/1000m or 5K/1000m
For altitudes >2000m, see Fig. 13-2
2
IEC 62477-1, EN 50178, not conductive

Humidity **)Vibration sinusoidal ***)
Shock ***)
Altitude
Altitude derating
Degree of pollution*) Operational temperature is the same as the ambient temperature and is defined as the air temperature 2cm below the unit.
**) Do not energize while condensation is present***) Tested in combination with DIN rails according to EN 60715 with a height of 15mm and a thickness of 1.3mm and standard mounting orientation.

Fig. 13-1 Output current vs. ambient temp.
(Inom 10A; Iout with PowerBoost = 12A)

Fig. 13-2 Output current vs. altitude at 24V

Allowed Output current at 5V

12A

A

B

10A
7.5A
A: continuous
B: short term (max. 60s)

0
-25

0

20

45

60 70°C

Ambient Temperature

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

13/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

14. PROTECTION FEATURES
Output protection
Output over-voltage protection

Reverse input polarity protection
Output over-current protection
Degree of protection
Penetration protection
Over-temperature protection
Input transient protection
Internal input fuse*)

Electronically protected against overload, no-load and short-circuits *)typ. 5.9Vdc
in case of an internal power supply defect, a redundant circuit
limits the maximum output voltage. The output shuts down andmax. 6.1Vdc
automatically attempts to restart.
Includedunit does not start when input voltage is reversed
electronically limited *)see Fig. 5-1
IP20
EN/IEC 60529> 3.5mme.g. screws, small partsyes
output shut-down with automatic restart
MOV
Metal Oxide Varistor
included
not user replaceable

In case of a protection event, audible noise may occur.

15. SAFETY FEATURESClassification of output voltage
Class of protection

Isolation resistancePE resistance
Touch current (leakage current)

*)

SELV
III

IEC/EN 60950-1
PE (Protective Earth) connection not required. A connection of
the “Chassis Ground” pin to earth is recommended for best EMI
performance> 100MOhm
input to output, 500Vdc< 0.1Ohm
between housing and Chassis Ground terminal
The leakage current which is produced by the DC/DC converter itself depends on the input
voltage ripple and need to be investigated in the final application.
For a smooth DC input voltage, the produced leakage current is less than 100µA.

provided, that the input voltage meets the requirements of chapter 2.

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

14/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

16. DIELECTRIC STRENGTH
The output voltage is floating and has no ohmic connection to the ground.
Type and factory tests are conducted by the manufacturer. Field tests may be conducted in the field using the appropriate test
equipment which applies the voltage with a slow ramp (2s up and 2s down). Connect all input terminals together as well as all output
poles before conducting the test. When testing, set the cut-off current settings to the value in the table below.
Type test

60s

A
1500Vac

Factory test

5s

1500Vac

1500VacField test

5s

1000Vac

1000Vac

500VacCut-off current setting> 30mA> 30mA> 12mA

Fig. 16-1 Dielectric strength

Input
+

B

-

OutputA
ChassisgroundB
1500Vac

C
500Vac
500Vac+C-

To fulfill the PELV requirements according to EN60204-1 § 6.4.1, werecommend that either the + pole, the – pole or any other part of the output
circuit shall be connected to the protective earth system. This helps to avoid
situations in which a load starts unexpectedly or cannot be switched off
when unnoticed earth faults occur.

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

15/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

17. APPROVED, FULFILLED OR TESTED STANDARDSUL 508LISTED for use as Industrial Control Equipment;
U.S.A. (UL 508) and Canada (C22.2 No. 107-1-01);
E-File: E198865
CB Scheme Certificate
General safety requirements for Information Technology Equipment(ITE)
UL Certificate
Recognized component for category QQGQ - Information Technology
Equipment (ITE)
Applicable for US and Canada
E-File: E137006
Agency Certificate (Bureau Veritas)
EN 60079-0 Explosive atmospheres - General requirements
EN 60079-7, EN 60079-15 Equipment protection by type of protection"e" and "n"Certificate: EPS 08 ATEX 1 142 X
Temperature Code: T4
Type of Protection: ec nC
IECEx Certificate
IEC 60079-0 Explosive atmospheres - General requirements
IEC 60079-15 Equipment protection by type of protection "n"Certificate: IECEx EPS 14.0001X
Temperature Code: T4
Type of Protection: ec nC
Paint Wetting Impairment Substances Test (or LABS-Test)
Tested for Zone 2 and test class C1 according to VDMA 24364-C1-L/W
for solvents and water-based paints

IEC 60950-1

UL 60950-1

ATEX

IECEx

Labs

18. REGULATORY PRODUCT COMPLIANCE
EU Declaration of Conformity

The CE mark indicates conformance with the- EMC directive- RoHS directive

REACH Regulation (EU)Manufacturer's Statement
EU regulation regarding the Registration, Evaluation, Authorisation andRestriction of Chemicals (REACH) fulfilled.

WEEE Regulation

Manufacturer's Declaration
EU Regulation on Waste Electrical and Electronic Equipment
Registered as business to business (B2B) products.
EU Regulation 2012/19/EU

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

16/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

19. PHYSICAL DIMENSIONS AND WEIGHT
WeightDIN rail

Installation Clearances

425g
Use 35mm DIN rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
The DIN rail depth must be added to the unit depth (102mm) to calculate the total required installation
depth.
See chapter 2

Fig. 19-1 Front viewFig. 19-2 Side viewSep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

17/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

20. ACCESSORIES
20.1. ZM10.WALL WALL MOUNTING BRACKETThis bracket is used to mount the devices on a wall/panel without utilizing the DIN rail. The bracket can be mounted without detaching
the DIN rail brackets from the power supply. Product for illustration purpose only.
Fig. 20-1 Isometric viewFig. 20-4 Wall/panel mounting, front viewFig. 20-2 Isometric viewFig. 20-5 Hole pattern for wall mounting

Fig. 20-3 Isometric viewFig. 20-6 Wall/panel mounting, side viewSep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

18/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

20.2. ZM11.SIDE SIDE MOUNTING BRACKETThis bracket is used to mount Dimension units sideways with or without utilizing a DIN rail. The two aluminum brackets and the black
plastic slider of the unit have to be detached, so that the steel brackets can be mounted.
For sideway DIN rail mounting, the removed aluminum brackets and the black plastic slider need to be mounted on the steel bracket.
Fig. 20-3
ZM11.SIDE Side mounting bracket *)*)Fig. 20-4
Side mounting with DIN rail brackets *)Picture of the DC/DC converter is for representation only

21. APPLICATION NOTES
21.1. BACK-FEEDING LOADS
Loads such as decelerating motors and inductors can feed voltage back to the DC/DC converter. This feature is also called return voltage
immunity or resistance against Back- E.M.F. (Electro Magnetic Force).
This DC/DC converter is resistant and does not show malfunctioning when a load feeds back voltage to the DC/DC converter. It does notmatter, whether the DC/DC converter is on or off.
The maximum allowed feed-back-voltage is 5.6Vdc. The absorbing energy can be calculated according to the built-in large sized output
capacitance which is specified in chapter 5.

21.2. INDUCTIVE AND CAPACITIVE LOADSThe unit is designed to supply any kind of loads, including unlimited capacitive and inductive loads.

21.3. EXTERNAL INPUT PROTECTION
The unit is tested and approved for branch circuits up to 50A. An external protection is only required, if the supplying branch has anampacity greater than this. Check also local codes and local requirements. In some countries local regulations might apply.
If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of the circuit
breaker. A minimum value of 10A B- or 8A C-Characteristic breaker should be used.

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

19/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

21.4. REQUIREMENTS FOR THE SUPPLYING SOURCE
In certain circumstances, the input filter of the DC/DC converter can show a resonant effect which is caused by the supplying network.
Especially when additional external input filters are utilized, a superimposed AC voltage can be generated on the input terminals of the
DC/DC converter which might cause a malfunction of the unit. Therefore, additional input filters are not recommended. To avoid theresonant effects, the minimal resistance of the supplying network which depends on the inductance of the input network, shall be
above the boundary curve in Fig. 21-1.
Fig. 21-1 External input filter requirements to avoid filter
instabilities
Resistance of the
supplying network

1 Ohm
(a)
(b)

100 mOhm
10 mOhm(a) max.
(b) typ.

1 mOhm
0.1mH

1mH

10mH

Inductance of the supplying network

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

20/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

21.5. PARALLEL USE TO INCREASE OUTPUT POWER
The DC/DC-converter can be paralleled to increase the output power. There are no featureincluded which balances the load current between the DC/DC-converters. Therefore some
restrictions and limitations apply. The DC/DC-converter with the higher adjusted output
voltage draws current until it goes into current limitation. This means no harm or switch-off
to this DC/DC-converter as long as the ambient temperature stays below 45°C

Unit A
Input+-

OutputLoad+

Unit BThe output voltages of all DC/DC-converters shall be adjusted to the same value (±100mV) at+
Input
full load. A fuse or diode on the output of each unit is only required if more than three units
are connected in parallel. This avoid that more than 2 times of the nominal output current
can flow backwards into the DC/DC converter in case the output stage of one DC/DC
Outputconverter has a defect. If a fuse (or circuit breaker) is used, choose one with approximately
150% of the rated output current of one DC/DC-converter. Keep an installation clearance of 15mm (left / right) between two DC/DCconverters and avoid installing the DC/DC-converters on top of each other. Do not use DC/DC-converters in parallel in mounting
orientations other than the standard mounting orientation (input terminals on the bottom and output terminals on top of the unit).

21.6. PARALLEL USE FOR REDUNDANCYThe DC/DC converters can be paralleled for 1+1 redundancy to gain higher system availability. Redundant systems require a certain
amount of extra power to support the load in case one DC/DC converter fails. The simplest way is to put two DC/DC converters inparallel. This is called a 1+1 redundancy. In case one DC/DC converter fails, the other one is automatically able to support the load
current without any interruption. Redundant systems for a higher power demand are usually built in an N+1 method. E.g. six DC/DC
converters, each rated for 8A are paralleled to build a 40A redundant system.
Furthermore, 1+1 redundant systems can be built by using a DC/DC converter powered from a battery and a power supply with AC
input.
Please note: This simple way to build a redundant system does not cover failures such as an internal short circuit in the secondary sideof the DC/DC-converter. In such a case, the defect unit becomes a load for the other DC/DC-converters and the output voltage cannot
be maintained any more. This can only be avoided by utilizing decoupling diodes which are included in the decoupling module
YR2.DIODE.
Recommendations for building redundant power systems:a)

Use separate input fuses for each DC/DC-converter.

b)

Monitor the individual DC/DC-converter units.

c)

1+1 Redundancy is allowed up to an ambient temperature of 60°C
N+1 Redundancy is allowed up to an ambient temperature of 45°Cd)

It is desirable to set the output voltages of all units to the same value (± 100mV) or leave it at the factory setting.

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

21/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

21.7. DAISY CHAINING OF OUTPUTS
Daisy chaining (jumping from one DC/DC-converter output to the next) is allowed as long as the average output current through one
terminal pin does not exceed 25A. If the current is higher, use a separate distribution terminal block.
Fig. 21-2 Daisy chaining of outputs

Fig. 21-3 Using distribution terminals

max 25A!

Output+ + - -

Output+ + - -

DC/DC
Converter
Input

+

-

Output+ + - -

Output+ + - -

DC/DC
Converter

DC/DC
Converter

DC/DC
Converter

Input

Input

Input

Load

+

-

Load

Distribution
Terminals

21.8. USE IN A TIGHTLY SEALED ENCLOSURE
When the DC/DC-converter is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher than outside. In
such situations, the inside temperature defines the ambient temperature for the DC/DC-converter.
The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure.
The DC/DC-converter is placed in the middle of the box, no other heat producing items are inside the box
Enclosure:
Load:
Input:
Temperature inside enclosure:
Temperature outside enclosure:
Temperature rise:

Rittal Typ IP66 Box PK 9516 100, plastic, 110x180x165mm
5.1V, 8A; (=80%) load is placed outside the box
24Vdc
48.0°C (in the middle of the right side of the DC/DC converter with a distance of 2cm)
22.6°C
25.4K

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

22/23

CD5.051
DC/DC Converter 5V, 10A, 50W

CD-Series

21.9. MOUNTING ORIENTATIONSMounting orientations other than input terminals on the bottom and output on the top require a reduction in continuous output power
or a limitation in the max. allowed ambient temperature. The amount of reduction influences the lifetime expectancy of the DC/DC
converter. Therefore, two different derating curves for continuous operation can be found below:
Curve A1
Curve A2

Recommended output current.
Max allowed output current (results in approximately half the lifetime expectancy of A1).

Fig. 21-4

O u tp u t C u rre n t

Mounting Orientation A

12A

OUTPUT(Standard orientation)

A1

10
8

DC/DC
Converter

6
4
2

INPUT

A m b ie n t T e m p e r a tu r e

0
10

20

Fig. 21-5

O u tp u t C u rre n t

Mounting Orientation B

12A

INPUT

(Upside down)

30

40

6 0 °C

50

10

A2

8

A1

DC/DC
Convert er

6

OUTPUT0

4
2

A m b ie n t T e m p e r a tu r e

10

20

Fig. 21-6

O u tp u t C u rre n t

Mounting Orientation C

12A(Table-top mounting)

30

40

50

6 0 °C50

6 0 °C50

6 0 °C

10
A2

8

A1

6
4
2

A m b ie n t T e m p e r a tu r e

0
10

20

Fig. 21-7

O u tp u t C u rre n t

Mounting Orientation D

12A

40

10

OUTPUT

INPUT

DC/DC
Convert er(Horizontal cw)

30

A2

8

A1

6
4
2

A m b ie n t T e m p e r a tu r e

0
10

20

Fig. 21-8

O u tp u t C u rre n t

Mounting Orientation E

12A(Horizontal ccw)

30

40

INPUT

DC/DC
Convert er

OUTPUT

10
8

A2

6

A1

4
2

A m b ie n t T e m p e r a tu r e

0
10

20

30

40

50

6 0 °C

Sep. 2024/ Rev. 1.0 DS-CD5.051-EN
All parameters are specified at 5.V, 10A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany

23/23