EK76
Evaluation Kit
APPLICABLE PARTS (SOLD SEPARATELY)•SA310KR

INTRODUCTION
This kit contains everything needed for rapid prototyping with the SA310KR 3-phase driver. With a multitude of circuit options, the EK76 offers versatility when in comes to connecting inputs, measuring outputs,and conditioning signals to the specific application environment. High- and low- input signals for each phase
may be supplied from any 3 V to 18 V digital controller via standard pin header or SMA connectors. A removable 50 Ω termination resistor is offered for impedance-matched inputs. Coaxial measurement points areoffered for high-fidelity waveform measurement, so erroneous overshoot/ringing are cut down to a minimum. The layout is carefully optimized for signal and power transmission, while permitting easy integration
with system controllers and 3-phase loads.

ABSOLUTE MAXIMUM RATINGS
All specifications listed in the SA310 datasheet apply to this board, except as noted below. This board
uses components that limit SA310's full operating range in exchange for convenience to the customer.
Parameter
Output Current, continuous, within SOA
Power Dissipation, SA310www.apexanalog.com
Subject to Change

SymbolIOUTPDMax

Units

Limited By

2060AW

DUT-socket
DUT-HS© Apex Microtechnology Inc.
All rights reserved

May 2020
EK76U Rev AEK76
Figure 1: Circuit Diagram
CURRU

VCC
C1BIAS
IMONV

14R21BIAS

13R11
R12R13
R14312VCC 4 V+
5V- 11

R1569R16710+-

GNDV

2+-

IMONU

1R10+-GNDU

U1+-

R23
R98

R22C4BIAS
IMONW

R20
R19GNDW

R18
R17P15

R24VCCCURRV

R25C3CURRWC2CBP2OPTIONAL CURRENT SENSE CIRCUITP16

CBP1D4R6socket
P14P13P12P11P10P9

INW_H
INW_L
INV_H
INV_L
INU_H
INU_L

12345678910VCC

12348765

D5VCC

VCC

12348765

D6VCC

VCC

1234Vcc
INW_HS
11
INW_LS12
INV_HS
13
INV_LS14
INU_HS
15
INU_LS
16
DGND

16151413
1211109R5

D3R8

LED1

D1912345678

D2+

CBP510R7R4CBP3VCC

VCC+CBP4PGND_W
OUT_W+VS_VW
OUT_V
DUT PGND_V+VS_U
OUT_U
PGND_U

8P17P5654P43P321Press-Fit Sockets –90 mil PTH ±2 mil

8765+Vs
PGND
WVU

R3HS,CSR

J1

IMON_W

IMON_V

P8
P7

R2HS,CSR

INU_H
INV_H
INW_H
IM_U
IM_W

246810121416

13579111315

INU_L
INV_L
INW_L

DGND

P6

PGND

R1HS,CSR

IMON_U

IM_V

P2

2

EK76U Rev AEK76
PARTS LIST
Reference

Manufacturer Part #Description

QTY

EVAL94

Printed Circuit Board

1CSR03
CFR-50JB-52-430K
4610X-101-510LF
PPTC101LFBN-RC
4116R-1-221LF
RR03J150KTB

Res, 10mΩ, 16W, 5%, TO-220Res, 430kΩ, 1/2W, 5%, Axial
Res, 9 array, 51Ω, 0.2W, SIP
SIP Socket, 10pin
Res, 8 array, 220Ω, TH DIPRes, 150kΩ, 3W, 5%, Axial

321111OX7RR105KWN
2220Y1K00474KXTWS2380LX122M400A082

Ceramic Cap, 1 µF, 200V
Ceramic Cap, 470nF, 1KV, X7R, 2220
Electrolytic Cap, 1200µF, 400V

122

P6KE27A-TP
P6KE400A
UC3611N
LTL2R3KRD-EM

TVS diode, 23.1V standoff, 5W
TVS diode, 342V standoff, 5W
Diode, 4 array, 50V, 3A
LED, red, 2mA nominal

12316342-0-15-15-42-27-10-0
TS01
M20-9980845
731711900
571-0100
HS39CR101-75AE
CLA-TO-21E
TW2294639A288
91841A007
90272A151
90272A150
91735A190
2221
TFT20014NA005-6"

Pin Receptacle, 20A
5-Block Terminal Strip
Pin header, 2 x 8, 0.1" pitch
BNC connector, vertical, PC mountBanana Jack, horizontal, PC mount
Heatsink, Power DIP, slotted, 1.7°C/W
Heatsink, 3 x TO-220, clip-on
Heatsink Cam Clips
Thermal Washer, KR package
3/16" nylon spacer#6-32 nut
#6-32 x 3/4" panhead screw#6-32 x 5/8" panhead screw#8-32 x 1/4" panhead screw#8-32 x 2" standoff
Teflon Tubing

161
1321
13
1
662
444
1

Printed Circuit Board
EVAL94

Resistors
R1, 2, 3
R4,5
R6
R6-socket
R7
R8Capacitors
CBP1
CBP2, 3
CBP4, 5

Diodes
D1
D2, 3
D4, 5, 6
LED1

HardwareDUT-socket
P1
P2
P3, 4, 5
P15, 16
DUT-HS
CSR-HS
DUT-TW

EK76U Rev A

3

EK76
Optional Components (NotIncluded)
P6-14
U2C1, 2, 3
C4
R9, 12, 13, 16, 17, 20
R10, 11, 14, 15, 18, 19
R21
R22
R23, 24, 25

4CON-SMA-EDGE-S
LM6134BIN/NOPB
C0805C104M5RACTU
ERA-6AEB4992V
ERA-6AEB103V
RMCF0805JT39K0
3386P-1-103LF
RMCF0805ZT0R00

SMA Connector
Quad Op Amp, 14 DIP through hole
CAP 0805 Not Populated
CAP 0805 100nF 50V X7R
RES 0805 49.9kΩ 1/8W 0.1%
RES 0805 10kΩ 1/8W 0.1%
RES 0805 39kΩ 1/8W 5%
Trimmer, 10kΩ, Through hole
RES 0805 0Ω Jumper

91316611
3

EK76U Rev AEK76
BEFORE YOU GET STARTED•••••••All Apex Microtechnology amplifiers should be handled using proper ESD precautions.
Always use the heat sink included in this kit.
Always use adequate power supply bypassing.
Do not change the connections while the circuit is powered.
Initially set all power supplies to the minimum operations levels allowed in the device data sheet.
Check for oscillations.
Please refer to Application Note, AN01 for general operating conditions.

ASSEMBLY INSTRUCTIONS
During the assembly, please refer to the circuit schematics, assembly drawings, and the data sheet of thepart being used on the evaluation kit.
1. Note that each side of the EVAL94 circuit board is identified as either the Component side or the DUT(Device Under Test) side. The component side has the designators printed on that side.
2. First, insert the 16 pin receptacles from the DUT side, into the DUT position. These will be a tight fit, so aflat piece of metal is recommended as a finger-shield to fully engage the receptacles with the plated
through-holes. This tight fit is meant to keep perpendicularity between the PCB and the pin direction.
Ensure the hexagonal portions go completely through the holes, and the circular flange rests on the DUT
side of the PCB. Solder the pin receptacles from the Component side.
3. Solder the surface-mount capacitors CBP1, CBP2, and CBP3 on the Component side.
4. If current-sense offset or gain adjustment is required, install the optional components U2 and surrounding
resistors/capacitors. These components are not included, as this is only necessary in unique applications
where current sense must be tightly managed. See "Current Sense" section below.
5. Install the smaller components, including R4-8, D1-6, LED1, and P2. Note that R6 includes a socket to easily swap between high-impedance inputs (R6 not installed) and 50-Ohm terminated inputs (R6 installed).
Each element of this resistor can dissipate up to 200mW. Match the direction of R6 with the PCB designator when installing. Also match all diode orientations with their respective designators.
6. Use a piece of heavy wire (16 to 14 AWG, 1.3 to 1.8 mm) to short J1. This should be the only connection
between digital ground (DGND) and power ground (PGND).
7. Install P3, P4, and P5 BNC connectors for output sense with an oscilloscope. This is best done by soldering
the center pin first to anchor the component in place, then soldering the 4 external lugs.
8. Install R1, R2, and R3. Their heights must be set by the widened portion of the pins resting on the Component side of the PCB. This will place the plastic package 4mm above the PCB.
9. Apply a thin layer of thermal grease (not included) the backside of R1, R2, and R3. Place the CSR-HS(CR101-75AE; the smaller of the two included heatsinks) behind these resistors, with the mounting lugs
engaging the PCB holes. Solder these mounting lugs while keeping the heatsink perpendicular to theboard.
10. From either side, slide the cam clips (CLA-TO-21E) into the hooked slot of the CSR-HS. The tabs should bepointed at a 45° angle down and away from the heatsink. Once the clip is in front of a resistor, flip the tab
all the way up to apply pressure to each resistor.
11. Install P1, P15, and P16.
12. Install electrolytic bypass capacitors CBP4 and CBP5, ensuring that the orientation matches the circuit
schematic drawing.
13. P6 through P14 have edge-connector pads. These pads are designed for edge-mount SMA connectors (notincluded). If SMA connection is not desired, leave these pads unpopulated. Otherwise, use recommended
part number CON-SMA-EDGE-S (or similar) and solder these to the board.

EK76U Rev A5

EK76
14. Make sure all leads protruding out the DUT side are clipped to under 1/8 inch (3mm).
15. When installing the DUT-HS, start by temporarily fastening the central 2 holes to the board. Pass the #632 x ¾" screws through the heatsink and place a nylon spacer on each. Carefully pass this assembly
through the matching holes on the PCB and fasten with #6-32 nuts on the component side.
16. Now, make a similar assembly at each corner of the heatsink. Pass the #6-32 x 5/8" screws through theheatsink while holding a nylon spacer between the board and heatsink (pliers would be helpful). Fasten
with #6-32 nuts on the component side and tighten.
17. Undo the first two screws and nuts, but leave the nylon spacers sandwiched between the heatsink andboard.
18. Cut the Teflon tubing into ¼ inch (6mm) pieces and slide the pieces onto the pins of the DUT. This is anadded precaution to prevent the heatsink or thermal washer from shorting against the pins. One sleeveon each of 4 corners of the DUT is sufficient. Do not cut Teflon longer than the recommended length, as
this will prevent proper seating of the DUT on the heatsink.
19. Place a single TW22 thermal washer over the heatsink area where the DUT will go. Place the DUT in thisspace, so its pins pass through the TW22 and the heatsink slots. Rest the pins over the pin receptaclesfrom step 2. Engaging all 16 receptacles requires much force. Rather than applying this force by hand,reinstall the #6-32 x ¾" screws and nuts, this time passing through the DUT tabs and TW22. With the #632 nut on the component side, tighten the screws in small increments, switching frequently between thetwo screws. Make sure the TW22 is loose and centered up until the final tightening, or else the metallic
foil can short out the DUT's pins.
20. Use the #8-32 x ¼" screws to mount a 2-inch standoff on each corner of the PCB.

HEATSINK GUIDELINES
Determining heatsink size for SA310 depends on several factors. Refer to SA310 datasheet for more information on calculating power dissipation, thermal resistance, and finding thermal ratings.

MOTOR CONTROL
P2 is designed to match the “remote amplifier” connector on Precision Motion Device's DK78113 developer kit for the Juno Velocity & Torque Control IC. Follow the instructions in the DK78113 User Manual toconnect a remote amplifier. Applications requiring torque control will require the Current Sense gain and offset circuit described below. Use default values when pairing with the Juno device.
Other motor control ICs may be used with EK76, but these may require different wiring and/or current
sense circuits.

6EK76U Rev A

EK76
CURRENT SENSE
The optional current sense gain and offset circuit is designed to interface with various ADCs in closedloop current/torque control. Follow the below schematic and equations to determine the proper component
values.

3X

PGND_X

VCC

1X
BIAS

Phase
Current

R1-310 ŵɏ

RIN+-

RIN

PGND

Value

Applicable Designators on
EVAL94

VOS
VOUT_MAXIOUT_MAX

Bias-Gain

-RF
RIN
RT
RL
C4fFIL

RL

RF

C4

IM_X
RFIL
RF

DGND

Equation

+-

RT

CFIL

BIAS

DGND

Default
Value

Units

Suggested
Tolerance

1.65
3.3
33

V
V
A

-

5

V/V

-

R9, 12, 13, 16, 17, 20
R10, 11, 14, 15, 18, 19
R22 (potentiometer)
R21C4

ADC min input (or higher)
ADC max input (or lower)< 80 A(VOUT_MAX-VOS) / (IOUT_MAX *10 mΩ)
1.8k < RF < 100k
RF / Gain
1k < RT < 100k
Roughly RT ((VCC/2VOS) – 1)
C4 = 100n

50k
10k10k39k100n

Ω
Ω
Ω
Ω
F

0.1%
0.1%
X7R

-

Typically 200k < fFIL < 1M∞Hz-

R23, 24, 25
Typically 100 < RFIL < 1k0
ΩRFIL
C1, 2, 3
1 / (2π * fFIL * RFIL)
0F
CFILAfter assembly of the EK76 including the above Current Sense circuit, R22 must be trimmed to reach thedesired value of VOS. To do this, attach a Voltmeter to measure the voltage between pins 11 (negative) and13 (positive) of P2. Apply the low-voltage supply VCC (+VS should NOT be active). Adjust R22 until the desired
value for VOS is shown on the Voltmeter.
The following equation represents the Low-Side Phase Current (IPHASE) as a function of voltage measured
at IM_X (VM):V M – V OS
I PHASE = -------------------------------Gain  0.01

EK76U Rev A

7

EK76
Figure 2: Top View

8

EK76U Rev AEK76
Figure 3: Bottom View

EK76U Rev A9EK76
TEST ASSEMBLY
EQUIPMENT NEEDED
1.
2.
3.
4.

Power Supplies
Digital Controller or 6+ Channel Pattern Generator
Oscilloscope
Proper Heatsinking System

TEST SETUP
Make sure all supplies are turned off before connection. Connect the power supplies VCC (via P15 andP16) and +VS (via P1). See SA310 datasheet for acceptable voltage levels. The +VS LED will be visibly bright forvoltages 30V and above. For lower voltages, consider using a smaller-value resistor for R8.
When sequencing power supplies, use the following order:
Power ON: VCC, then +VSPower OFF: +VS, then VCC
It is recommended to first test the device with no load attached. Ensure the output waveform follows theexpected results before connecting a load. Consider power dissipation in the amplifier, sense resistors, andthe load.
The BNC connectors P3, P4, and P5 are designed for coaxial measurement of the output; these are notmeant to carry significant current. ONLY USE P1 FOR HIGH-CURRENT CONNECTIONS. To use P3-P5, for voltages within the oscilloscope's input rating, BNC cables may be used to connect directly to the oscilloscope.
For higher voltages, use a high-voltage oscilloscope probe with a probe-tip-to-BNC adapter. Alternatively, use
high-voltage BNC attenuators in series with the BNC cable.

NEED TECHNICAL HELP? CONTACT APEX SUPPORT!

For all Apex Microtechnology product questions and inquiries, call toll free 800-546-2739 in North America. Forinquiries via email, please contact apex.support@apexanalog.com. International customers can also request
support by contacting their local Apex Microtechnology Sales Representative. To find the one nearest to you,go to www.apexanalog.com
IMPORTANT NOTICE
Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. However, the information issubject to change without notice and is provided "AS IS" without warranty of any kind (expressed or implied). Apex Microtechnology reserves the rightto make changes without further notice to any specifications or products mentioned herein to improve reliability. This document is the property ofApex Microtechnology and by furnishing this information, Apex Microtechnology grants no license, expressed or implied under any patents, maskwork rights, copyrights, trademarks, trade secrets or other intellectual property rights. Apex Microtechnology owns the copyrights associated with theinformation contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Apex
Microtechnology integrated circuits or other products of Apex Microtechnology. This consent does not extend to other copying such as copying for
general distribution, advertising or promotional purposes, or for creating any work for resale.
APEX MICROTECHNOLOGY PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN PRODUCTS USED FOR LIFESUPPORT, AUTOMOTIVE SAFETY, SECURITY DEVICES, OR OTHER CRITICAL APPLICATIONS. PRODUCTS IN SUCH APPLICATIONS ARE UNDERSTOOD TO BEFULLY AT THE CUSTOMER OR THE CUSTOMER’S RISK.
Apex Microtechnology, Apex and Apex Precision Power are trademarks of Apex Microtechnology, Inc. All other corporate names noted herein may betrademarks of their respective holders.

10EK76U Rev A