Reference Design

P-5

REV.: 0/2017

www.recom-power.com

R-REF01-HB

Schematic

Description:

The reference design board requires a single supply voltage with a range of 15-42V.

IC5 creates the regulated 12V supply for IC2 and IC3.

IC2 generates the isolated high-side gate-driver supply voltage. Choose the appropriate DC/DC converter from the selection provided.

IC3 generates the isolated low-side gate-driver supply voltage. Choose the appropriate DC/DC converter from the selection provided.

IC8 creates a +Vcc rail required for the gate driver.

IC1 isolates the control signals and level shifts the TTL input to the gate-drive voltages.

IC7 can be mounted instead of IC1 if reinforced isolation is required.

IC4 and IC5 amplify the maximum gate-drive current to ±10A.

R24 and R25 are not fitted. Zero

Ω resistors can be mounted if IC4 and IC5 are not required (for example GaN transistors).

The input GND1 is galvanically isolated from the high-side GNDA and the low-side GNDB.

For single-ended designs, it is recommended to connect GND1 to Power-GND (CON3) with a star-earth configuration.

For full-bridge configurations, couple GND1 to Power-GND with Y-Capacitors to avoid generating high potentials caused by common mode currents.

R15, R16, R17 and R18 are not fitted. The positions can be used to add dummy loads for the power supplies if needed, for example, under very light load

conditions or low switching frequencies. Alternately R16 and R18 can be used to allow single-output voltage DC/DC converters to be used by connecting -Vout

to the gate-driver ground.

Configuration

R15, R17

R16, R18

Dual Output DC/DC, Normal Load (standard)

Not required

Not required

Dual Output DC/DC, Light Load

12k

Ω

12k

Ω

Single Output DC/DC, Normal Load

Not required

Zero

Ω

Single Output DC/DC, Light Load

12k

Ω

Zero

Ω

R1 and R4 control the turn-on slew rate. 22

Ω is fitted as standard.

R2 and R5 control the turn-off slew rate. 3.3

Ω is fitted as standard.

These 0207 package resistors are made to withstand highly pulsed loads. Gate currents up to 10A are possible.

GNDI

GNDI

GNDI

GNDI

+12V

+5V

GNDI

GNDI

VDDA

VDDB

+5V

+5V

GNDI

GNDB

DRIVER

SOURCE

HS

VDDA

VDDA

DRIVER

SOURCE

HS

+5V

GNDA

+12V

VDDB

GNDI

GNDI

GNDI

+12V

GNDI

GNDI

+5V

GNDB

GNDB

VDDA

GNDA

GNDA

GNDA

VDDB

VDDB

GNDI

+12V

GNDI

GNDI

1

2

3

4

5

6

8

9

10

11

14

15

16

in1

in2

en

out2

out1

VCCI

GND

INA

INB

DISABLE

VCCI

DT

OUTB

VSSB

VDDB

VSSA

OUTA

VDDA

IC7-A

UCC21520

4

IC8-B

1

2

3

4

5

+Vin

-Vin

-Vout

Gnd

+Vout

IC3

R12Pxx

1

2

R2

3R3

0207

1W

R23

10K

0603

100mW

1

2

R11

10K

0603

100mW

1

2

C19

1uF

16V

0603

1

2

R19

0R

0603

100mW

3

4

1

2

5

10

9

11

14

15

16

8

in1

en

VDDB

GNDA

VOA

VDDA

ENABLE

VDDI

GNDI

VIA

VIB

GNDB

VOB

VDD2

IC1

Si8273

1

2

C8

1uF

50V

0603

CON3

62409-1

2

1

D2 PMEG6010

1

in2

U2-A

BNC

1

2

R26

0R

0603

100mW

1

2

R25

0R 0603 100mW

1

2

C18

1uF

25V

0603

2

1

D1

PMEG6010

1

2

out2

R3

2K0

0603

100mW

1

2

R5

3R3

0207

1W

1

2

C14

100nF

50V

0603

1

2

C15

1uF

50V

0603

1

2

3

4

5

+Vin

-Vin

-Vout

Gnd

+Vout

IC2

R12Pxx

1

2

R1

22R

0207

1W

R8

10K

0603

100mW

1

2

3

4

5

D

S

KS

GS

G

T1

1

2

C13

1uF

50V

0603

R9

10K

0603

100mW

R22

10K

0603

100mW

3

2

1

GND

+Vin

+Vout

IC8-A

L78L05

1

2

R24

0R 0603 100mW

1

2

R20

0R

0603

100mW

1

2

3

GND

+Vin

+Vout

IC5 R-78C12-1.0

1

2

C17

2.2nF

50V

0603

LED4

1

U1-A

BNC

1

2

C1

22uF

25V

1210

R10

10K

0603

100mW

1

2

R4

22R

0207

1W

R14

10K

0603

100mW

1

2

3

4

6

IC4

ZXGD3006E6TA

1

2

R21

0R

0603

100mW

LED2

1

2

C9

1uF

50V

0603

1

2

R16

12K

1206

250mW

R18

12K

1206

250mW

1

2

C6

100nF

50V

0603

1

2

C7

1uF

50V

0603

R7

10K

0603

100mW

1

2

R6

2K0

0603

100mW

LED1

1

2

C2

22uF

25V

1210

1

2

CON5

1

2

C3

1uF

50V

0603

1

2

C10

1uF

1kV

CON2

62409-1

1

2

C4

1uF

50V

0603

R15

12K

1206

250mW

R17

12K

1206

250mW

C12

100nF 50V 0603

C11

1uF

50V

0603

1

2

3

4

5

D

S

KS

GS

G

T2

1

2

3

4

6

IC6

ZXGD3006E6TA

1

2

CON4

61300211121

1

2

C16

10uF

50V

1210

2

1

CON1

39-29-0023

LED3

1

2

C5

4.7uF

50V

1206

1

2

FB1

110R 4A 1806

VDDB Supply

5V Supply

12V Supply

VDDA Supply