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SERIES: VXO78-1000 │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATORFEATURES• wide input• pin-out compatible with linear regulators• open frame• UL & CSA approved• high efficiency up to 96%• no-load input current as low as 0.2 mA• wide operating temp: -40°C to +85°C• supports negative output• short circuit protection on the output• designed to meet EN/BS EN 62368-1

MODELinput
voltage1

outputvoltageoutput
current

outputpower

ripple& noise2

efficiency3

typ(Vdc)

range(Vdc)

(Vdc)

max
(mA)

max
(W)

max
(mVp-p)typ(%)

VXO7803-1000

246~36

3.3

1000

3.375

90

VXO7805-1000

24
128~36
8~27

5-5

1000
-500

5
2.5

75
75

93
86

VXO78012-1000

24
1216~36
8~20

12-12

1000
-300

12
3.6

75
75

96
89

VXO78015-1000

24
1220~36
8~18

15-15

1000
-300

15
4.575
75

96
89

Notes:

1. For input voltages higher than 30 Vdc, a 22 µF / 50 V input capacitor is required.
2. Tested at nominal input, 20~100% load, 20 MHz bandwidth, with 10 µF electrolytic and 1 µF ceramic capacitor on the output. At loads below 20%, the max ripple andnoise of the 3.3 & 5 Vdc outputs will be 100 mVp-p, and the other outputs will be 2% Vo.
3. Measured at min Vin, full load.
4. All specifications are measured at Ta=25°C, humidity < 75%, nominal input voltage, and rated output load unless otherwise specified.

PART NUMBER KEY

VXO78 XX - 1000
Base NumberOutput Voltage

cui.comOutput Current

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date 03/30/2023 │ page 2 of 7

INPUTparameter

conditions/description

operating input voltage1

for positive output applications
for negative output applications

filtercapacitor filtermintypmax

units

6824
1236
27

Vdc
Vdc

0.1

1mA

typmax

units

680
330

μF
μF

input reverse polartiy protection nono-load input current
Note:

positive outputs

1. See Model section on page 1 for specific input voltage ranges.

OUTPUTparameter

conditions/description

maximum capacitive load2

for positive output applications
for negative output applications

voltage accuracy

at full load, input voltage range
3.3 Vdc output model
all other models±2±2±4±3%%line regulation

at full load, input voltage range±0.2±0.4%load regulation

at nominal input, 10~100% load±0.4±0.6%

switching frequency

at nominal input voltage, full load
3.3/5 Vdc output models
all other models

520680620
780

kHzkHztransient recovery time

at nominal input voltage, 25% load step change

0.11mstransient response deviation

at nominal input voltage, 25% load step change

50300mVtemperature coefficientat full load

±0.03%/°C

Note:

min

4205802. The maximum capacitive load was tested at nominal input voltage, full load.

PROTECTIONS
parameter

conditions/description

short circuit protection

continuous, auto recoverymintypmaxunits

mintypmaxunits

SAFETY AND COMPLIANCE
parameter

conditions/description

safety approvals

certified to 60950-1: UL
designed to meet 62368-1: EN, BS EN

EMI/EMCEN 55032, EN 55024

conducted emissions

CISPR22/EN55022, class B (external circuit required, see Figure 4-b)radiated emissions

CISPR22/EN55022, class B (external circuit required, see Figure 4-b)

ESD

IEC/EN61000-4-2, contact ± 4kV, class B

radiated immunity

IEC/EN61000-4-3, 10V/m, class A

EFT/burst

IEC/EN61000-4-4, ± 1kV, class B (external circuit required, see Figure 4-a)surge

IEC/EN61000-4-5, line-line ± 1kV, class B (external circuit required, see Figure 4-a)conducted immunity

IEC/EN61000-4-6, 3 Vr.m.s, class A

MTBF

as per MIL-HDBK-217F, 25°C

RoHS

2011/65/EU

2,000,000

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ENVIRONMENTAL
parameter

conditions/descriptionminmaxunits

operating temperature

see derating curve

-40

85°C

-55

125°C

595%

max

units

260°C

max

units

storage temperaturestorage humidity

non-condensing

typSOLDERABILITY
parameter

conditions/description

wave soldering

see wave soldering profile

min

typ

Peak Temp. 260°C Max.
Wave Soldering Time
4 Sec. Max.

250

Temperature (°C)

20010 Sec. Max.
150

100500MECHANICALTime (sec.)

parameter

conditions/description

dimensions

11.50 x 7.50 x 17.50 [0.453 x 0.295 x 0.689 inch]minweight

typ

mm
2.1

MECHANICAL DRAWING
units: mm [inch]
tolerance: ±0.50[±0.020]
pin diameter tolerance: ±0.10[±0.004]
PIN CONNECTIONSPIN+OUTPUT-OUTPUT

1+VIN+VIN

2GND

-VOUT

3+VOUT

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3D ModelCUI Inc │ SERIES: VXO78-1000 │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATORDERATING CURVEEFFICIENCY CURVES

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3D ModelCUI Inc │ SERIES: VXO78-1000 │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOREFFICIENCY CURVES (CONTINUED)

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CUI Inc │ SERIES: VXO78-1000 │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR

date 03/30/2023 │ page 6 of 7

TYPICAL APPLICATION CIRCUIT
Figure 1

Figure 2

Positive Output Application Circuit

Negative Output Application Circuit

Figure 3
Positive and Negative Output Paralleling Application Circuit

Table 1
External Capacitor Table
Model Number

C1, C3
C2, C4(ceramic capacitor) (ceramic capacitor)

VXO7803-1000

10 μF/50 V

22 μF/10 V

VXO7805-1000

10 μF/50 V

22 μF/10 V

VXO78012-1000

10 μF/50 V

22 μF/25 V

VXO78015-1000

10 μF/50 V

22 μF/25 V

EMC RECOMMENDED CIRCUITFigure 4Table 2
Recommended external circuit components

Note:

FUSE

choose according to actual input current

MOVS20K30

LDM182 µH

C0680 µF/50 V

C1, C2

see Table 1

C3

4.7 µF/50 V

LDM212 µH

1. C1 & C2 (C3 & C4) are required and should be connected as close to the module pins as possible.
2. To reduce the output ripple further, C2 & C4 can be increased as needed and the use of tantalum or low ESR electrolytic capacitors would be recommended.
3. When using application circuit in Figure 3, a 10 µH LDM component is recommended to reduce the interference.

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CUI Inc │ SERIES: VXO78-1000 │ DESCRIPTION: NON-ISOLATED DC SWITCHING REGULATOR

date 03/30/2023 │ page 7 of 7

REVISION HISTORY
rev.

description

date

1.0

initial release

05/19/2017

1.01

logo & packaging updates

02/21/2020

1.02

features and safety line updated

01/14/2021

1.03

derating curve, efficicency curves and circuit figures updated

09/21/2021

1.04

safeties updated

12/20/2022

1.05

application circuits updated

03/30/2023

The revision history provided is for informational purposes only and is believed to be accurate.

Headquarters
20050 SW 112th Ave.
Tualatin, OR 97062
800.275.4899

Fax 503.612.2383
cui.comtechsupport@cui.com

CUI offers a two (2) year limited warranty. Complete warranty information is listed on our website.
CUI reserves the right to make changes to the product at any time without notice. Information provided by CUI is believed to be accurate and reliable. However, no responsibility isassumed by CUI for its use, nor for any infringements of patents or other rights of third parties which may result from its use.
CUI products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical component is any component of alife support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.