Iepc Epc9034 User manual

Development Board

EPC9034

Quick Start Guide

80 V Half-bridge with Gate Drive, Using EPC2021

Revision 2.0

QUICK START GUIDE

EPC9034

QUICK START PROCEDURE

The half bridge development board EPC9034 is easy to set up as buck or

boost converter. Refer to gure 2 for buck converter conguration and

measurement setup, and gure 3 for boost converter setup, and follow the

procedure below:

Buck converter conguration

1. With power o, connect the input power supply bus to VIN (J5, J6) and

ground / return to GND.

2. With power o, connect the switch node (SW) of the half bridge to your

circuit as required (half bridge conguration). Or use the provided pads

for inductor (L1) and output capacitors (Cout), as shown in gure 2 with a

DC load connected across VOUT and GND.

3. With power o, connect the gate drive supply to VDD (J1, Pin-1) and

ground return to GND (J1, Pin-2 indicated on the bottom side of the

board).

4. With power o, connect the input PWM control signal to PWM1 (J2,

Pin-1) and ground return to any of GND J2 pins indicated on the bottom

side of the board.

5. Turn on the gate drive supply – make sure the supply is between 7.5 V

and 12 V.

6. Turn on the controller / PWM input source.

7. Making sure the intial input supply voltage is 0 V, turn on the power

and slowly increase the voltage to the required value (do not exceed

the absolute maximum voltage). Probe switching node to see switching

operation.

8. Once operational, adjust the PWM control, bus voltage, and load within

the operating range and observe the output switching behavior,

eciency and other parameters.

9. For shutdown, please follow steps in reverse.

EPC9034 development board

Front view

Table 1: Performance Summary (TA= 25°C) EPC9034

Symbol Parameter Conditions Min Max Units

VDD Gate Drive Input Supply Range 7 12 V

VIN Bus Input Voltage Range(1) 64(1) V

IOUT Switch Node Output Current (2) 35(2) A

VPWM

PWM Logic Input Voltage

Threshold

Input ‘High’

Input ‘Low’

3.5

1.5

VSW Switch-node Voltage

64(1)

Minimum ‘High’ State Input

Pulse Width

VPWM rise and fall

time < 10ns 50 ns

Minimum ‘Low’ State Input

Pulse Width (3)

VPWM rise and fall

time < 10ns 100(3) ns

(1) Maximum input voltage depends on inductive loading, maximum switch node ringing

must be kept under 80 V for EPC2021.

(2) Maximum current depends on die temperature – actual maximum current with be

subject to switching frequency, bus voltage and thermal cooling.

(3) Limited by time needed to ‘refresh’ high side bootstrap supply voltage.

DESCRIPTION

The EPC9034 development board is a 80 V maximum device voltage, 35 A

maximum output current, half bridge with onboard gate drives, featuring

the EPC2021 enhancement mode (eGaN®) eld eect transistor (FET).

The purpose of this development board is to simplify the evaluation

process of the EPC2021 eGaN FET by including all the critical components

on a single board that can be easily connected into the majority of

existing converter topologies.

The EPC9034 development board measures 2” x 2” and contains two

EPC2021 eGaN FETs in a half bridge conguration using the Texas

Instruments LMG1205 gate driver. The board also contains all critical

components and the layout supports optimal switching performance.

There are also various probe points to facilitate simple waveform

measurement and eciency calculation. A block diagram of the circuit

is given in gure 1.

For more information on the EPC2021 please refer to the datasheet

available from EPC at www.epc-co.com. The datasheet should be read in

conjunction with this quick start guide.

Back view

QUICK START GUIDE

EPC9034

Figure 2: Buck conguration

Figure 3: Boost conguration

Figure 1: Block diagram of EPC9034 development board

7.5 – 12 VDC

32 VDCmax

VDD supply

(Note polarity) VMain supply

(Note polarity)

Output Capacitor Output Inductor

Main voltage measurement

(HIGH VOLTAGE!)

DC load

Dead-time adjust

Control

signal

inputs

Boost Converter conguration

Warning: Never operate the boost converter mode without a load

as the output voltage can increase beyond the maximum ratings.

1. The inductor (L1) and input capacitors (labeled as Cout) can

either be soldered onto the board, as shown in gure 3, or

provided o board. Anti-parallel diodes can also be installed

using the additional pads on the right side of the EPC2021

FETs.

2. With power o, connect the input power supply bus to VOUT

(J9, Pin-1) and ground / return to GND (J9, Pin-2), or externally

across the capacitor if the inductor L1and Cout are provided

externally. Connect the output voltage (labeled as VIN, J5, J6)

to your circuit as required, e.g., resistive load.

3. With power o, connect the gate drive supply to VDD (J1,

Pin-1) and ground return to GND (J1, Pin-2 indicated on the

bottom side of the board).

4. With power o, connect the input PWM control signal to

PWM1 (J2, Pin-1) and ground return to any of GND J2 pins

indicated on the bottom side of the board. Note that the

bottom FET gate drive signal is inverted with regard to

PWM1. It is also possible to use separate input PWM signals

by removing R2 and R17 and installing 0 Ω jumpers for R14

and R16.

5. Turn on the gate drive supply – make sure the supply is

between 7.5 V and 12 V.

6. Turn on the controller / PWM input source.

7. Making sure the output is not open circuit, and the input

supply voltage is initially 0 V, turn on the power and slowly

increase the voltage to the required value (do not exceed

the absolute maximum voltage). Probe switching node to

see switching operation.

8. Once operational, adjust the PWM control, bus voltage, and

load within the operating range and observe the output

switching behavior, eciency and other parameters.

Observe device temperature for operational limits.

9. For shutdown, please follow steps in reverse.

7.5 – 12 V

VDD supply

(Note polarity)

Input Capacitor

Input Inductor

Dead-time adjust

Control

signal

inputs

32 VDCmax

DC load

VMain supply

(Note polarity)

Level shift

VDD

VIN

CBypass

PWM

GND

Gate drive

regulator

Gate driver

Output

PGND

Logic and

dead-time

adjust

QUICK START GUIDE

EPC9034

Figure 4: Measurement top side

Figure 5: Measurement bottom side.

Q1gate MMCX

(HIGH VOLTAGE!)

Ground oscilloscope probe

Switch-node oscilloscope probe

Q2gate

Ground

Voltage measurement:

Input voltage for Buck,

Output voltage for Boost

(HIGH VOLTAGE!)

Switch-node

output

Q2gate MMCX

THERMAL CONSIDERATIONS

The EPC9034 development board showcases the

EPC2021 eGaN FET. The EPC9034 is intended for

bench evaluation with low ambient temperature

and convection cooling. The addition of heat-sinking

and forced air cooling can signicantly increase

the current rating of these devices, but care must

be taken to not exceed the absolute maximum die

temperature of 150° C.

NOTE. The EPC9034 development board does not have any

current or thermal protection on board. For more information

regarding the thermal performance of EPC eGaN FETs, please

consult:

D. Reusch and J. Glaser, DC-DC Converter Handbook, a

supplement to GaN Transistors for Ecient Power Conversion,

First Edition, Power Conversion Publications, 2015.

MEASUREMENT CONSIDERATIONS

When measuring the high frequency content switch

node, care must be taken to provide an accurate high

speed measurement. An optional two pin header

(J10) is included for switch node measurement.

MMCX connector footprint is also provided (J15 in

gure 5) to measure switch node.

Low-side gate voltage (VGS2) can be measured at the

two pin header (J22) or the MMCX (J12). Please refer

to gure 4. R7 (0 Ω resistor) will need to be installed.

High-side gate voltage (VGS1) can only be measured

using the MMCX connector (J11). Please refer to

gure 4. R6 (0 Ω resistor) will need to be installed.

Dierential probe is recommended for measuring

high-side gate. IsoVu probes from Tektronix has

mating MMCX connector.

For regulator passive voltage probes (e.g. TPP1000)

measuring low-side gate or switch node using

MMCX connector, probe adaptor is available. PN:

206-0663-xx.

NOTE. For information about measurement techniques,

the EPC website oers: “AN023 Accurately Measuring

High Speed GaN Transistors” and the How to GaN

educational video series, including: HTG09-Measurement

Ground oscilloscope probe

Switch-node oscilloscope probe

Switch-node MMCX

QUICK START GUIDE EPC9034

Table 2: Bill of Materials

Item Qty Reference Part Description Manufacturer Part Number

1 3 C4, C10, C11 Capacitor, 1 µF, ±10%, 25 V X7R TDK C1608X7R1E105K

2 2 C5, C6 Capacitor, 0.1 µF, ±10%, 25 V X7R TDK C1608X7R1E104K

3 1 C9 Capacitor, 0.1 µF, ±10%, 25 V X7R Yageo CC0402KRX7R8BB104

4 2 C12, C14 Capacitor, 0.1 µF, ±10%, 16 V X7R Murata GRM155R71C104KA88D

5 1 C15 Capacitor, 0.022 µF, ±10%, 25 V X7R TDK C1005X7R1E223K050BB

6 2 C16, C17 Capacitor, 100 pF, ±10%, 50 V X7R Yageo CC0402KRX7R9BB101

7 1 C20 Capacitor, 4.7 µF, ±10%, 10 V X5R TDK C1005X5R1A475K050BC

8 10 C21, C22, C23, C24, C25,

C26, C34, C35, C36, C37 Capacitor, 1 µF, ±20%, 100 V X7S TDK C2012X7S2A105M125AB

9 7 C27, C28, C29, C30,C31,

C32, C33 Capacitor, 0.22 µF, ±10%, 100 V X7S Taiyo Yuden HMK107C7224

10 4 D1, D2, D5, D6 Schottky Diode, 30 V 30 mA Diodes Inc. SDM03U40

11 1 D4 Zener Diode, 5.1 V, 150 mW, ±5% Bournes CD0603-Z5V1

12 1 U2 100 V eGaN Driver TI LMG1205YFXR

13 2 Q1, Q2 eGaN FET, 80 V, 2.5 mΩ EPC EPC2021

14 1 Q3 eGaN FET, 100 V, 3300 mΩ EPC EPC2038

15 2 R1, R15 Resistor, 10 kΩ, ±5%, 1/10 W Yageo RC0603JR-0710KL

16 3 R2, R3, R17 Resistor, 0.0 Ω, 1/16 W Stackpole RMCF0603ZT0R00

17 1 R4 Resistor, 10 Ω, ±1%, 1/10 W Panasonic ERJ-3EKF10R0V

18 1 R5 Resistor, 100 Ω, ±1% 0.1 W, 1/10 W Panasonic ERJ-3EKF1000V

19 1 R9 Resistor, 0 Ω Jumper 0.063 W, 1/16 W Stackpole RMCF0402ZT0R00

20 2 R19, R21 Resistor, 2.7 Ω, ±5% 0.1 W, 1/10 W Panasonic ERJ-2GEJ2R7X

21 2 R20, R22 Resistor, 500 mΩ, ±1% 0.125 W, 1/8 W Stackpole PT0402FR-7W0R5L

22 1 R24 Resistor, 27 kΩ, ±5% 0.1 W, 1/10 W Panasonic ERJ-2GEJ273X

23 1 R25 Resistor, 20 Ω, ±5% 0.063 W, 1/16 W Stackpole RMCF0402JT20R0

24 1 U3 I.C., Regulator Microchip MCP1703T-5002E/MC

25 1 U1 I.C., Logic Fairchild NC7SZ00L6X

26 1 U4 I.C., Logic Fairchild NC7SZ08L6X

27 2 J1, J22 Connector Würth 61300211121

28 2 J2, J3 Connector Tyco 4-103185-0-04

29 2 TP1, TP2 SMT test point Keystone 5015

Optional Components

Item Qty Reference Part Description Manufacturer Part Number

1 DNP Cout TBD Generic Generic

2 DNP D3 Schottky Diode, 40 V 300 mA ST BAT54KFILM

3 DNP D7, D8 Schottky Diode, 100 V 2A Vishay SS2PH10-M3

4 DNP L1 Inductor - TBD Generic Generic

5 DNP P1, P2 Potentiometer, 1 kΩ 0.25 W, 1/4 W Murata PV37W102C01B00

6 DNP R10, R14, R16 Resistor, 0 Ω Jumper 0.1 W, 1/10 W Stackpole RMCF0603ZT0R00

7 DNP R6, R7 Resistor, 0 Ω Jumper 0.063 W, 1/16 W Stackpole RMCF0402ZT0R00

8 DNP R18 Resistor, 4.7 Ω, ±5% 0.1 W, 1/10 W Panasonic ERJ-2GEJ4R7X

9 DNP J9 7.62 mm Euro Term. Würth 691216410002

10 DNP J10 .1" Male Vert. Würth 61300211121

11 DNP J11, J12, J15 Connector Molex 0734152063

QUICK START GUIDE

EPC9034

Figure 6: EPC9034 - Schematic

uP1966A

.1" Male Vert.

7.5 VDC - 12 VDC

V7in

Logic Supply

V7in IN

GND

MCP1703T-5002E/MC

1 μF, 25 V

C10 1 μF, 25 V

1 μF, 25 V

C11

Logic Supply Regulator

0 Ω

VCC

P1 EMPTY

TBD

HIN

SDM03U40

VCC

Deadtime Lower

NC7SZ00L6X

LIN

PWM2 PWM1 P2 EMPTY

PWM2

.1" Male Vert.

PWM1

PWM2

100 pF, 50 V

C16

100 pF, 50 V

C17

2.7 Ω R19

R20 0.5 Ω

R21 2.7 Ω

R22 0.5 Ω

VSW

LIN

HIN

0.1 μF, 25 V

TBD

Cout

1 μF, 100 V

C21

vSW probe holes

L1 TBD

EMPTY

VSW

SW Output

Main Supply Input

GND

Sync Buck Output

0 Ω

VG1 EMPTY 1

J11

EMPTY

J12

EMPTY

TP2

TP1

J10

EMPTY

VG2

MMCX

vGS1 probe adapter

MMCX

vGS2 probe

adapter

4.7 V

VG2

Synchronous Boostrap Power Supply

Gbtst

20 Ω

R25

SDM03U40

40 V 30 mA

100 nF, 16 V

C14

CD0603-Z5V1

5V1, 150 mW

SDM03U40

40 V 30 mA

22 nF, 25V

C15

27 k

R24

4.7 Ω

2R18

EMPTY

100 nF, 16 V

C12

VCC

BAT54KFILM

40 V 300 mA

EMPTY

4.7 μF, 10 V

C20

VSW

VG1

VG2

4.7 V

0 Ω

VG1

VCC

5VHS1

VSW

100 V 2800 mΩ

EPC2038

5VHS1

VSW

220 nF, 100 V

C27

220 nF, 100 V

C28

220 nF, 100 V

C29

220 nF, 100 V

C30

220 nF, 100 V

C31

VSW

4.7 V

1 μF, 100 V

C22

1 μF, 100 V

C23

1 μF, 100 V

C24

SS2PH10-M3

100 V, 2 A

EMPTY

SDM03U40

100 nF, 25 V

10 k

Deadtime Upper

NC7SZ08L6X

PWM1 PWM1

0 Ω

R16 2

EMPTY

PWM1

0 Ω 2

R17

VCC

100 nF, 25 V

VCC10 k

R15

0 Ω 2

TBD

0 Ω

R14 2

EMPTY

0 Ω

R10

EMPTY

VCC

Direct Drive

Ext. Regulator

Int. Regulator

V7in

220 nF, 100 V

C32

220 nF, 100 V

C33

1 μF, 100 V

C25

1 μF, 100 V

C26

1 μF, 100 V

C34

1 μF, 100 V

C35

1 μF, 100 V

C36

1 μF, 100 V

C37

7.62 mm Euro Term.

EMPTY

0 Ω

EMPTY

.1" Male Vert.

J22

VSW

vSW probe adapter

J15

EMPTY

MMCX

VG2 SS2PH10-M3

100 V, 2 A

EMPTY

J3A

J3B

J3C

EPC2021

VOUT VOUT

VOUT

VIN

VLDO

Demonstration Board Notication

The EPC9034 board is intended for product evaluation purposes only. It is not intended for commercial use nor is it FCC approved for resale. Replace components on the

Evaluation Board only with those parts shown on the parts list (or Bill of Materials) in the Quick Start Guide. Contact an authorized EPC representative with any questions. This board is

intended to be used by certied professionals, in a lab environment, following proper safety procedures. Use at your own risk.

As an evaluation tool, this board is not designed for compliance with the European Union directive on electromagnetic compatibility or any other such directives or regulations. As board

buildsare at times subject toproduct availability, it is possible thatboardsmay containcomponentsor assemblymaterials that arenot RoHScompliant.EcientPowerConversionCorpora-

tion (EPC) makes no guarantee that the purchased board is 100% RoHS compliant.

The Evaluation board (or kit) is for demonstration purposes only and neither the Board nor this Quick Start Guide constitute a sales contract or create any kind of warranty, whether express

or implied, as to the applications or products involved.

Disclaimer: EPC reserves theright at any time, without notice, tomakechanges toany products described hereinto improvereliability, function, or design. EPC doesnot assume any liability

arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, or other intellectual property whatsoever, nor the

rights of others.

EPC Products are distributed through Digi-Key.

www.digikey.com

For More Information:

Please contact [email protected]om

or your local sales representative

Visit our website:

www.epc-co.com

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bit.ly/EPCupdates

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