3. Applications Information

The following sections detail the input and output circuits necessary for proper operation. Diagrams display IGBTs for the application

examples, but the application circuits are similar for SiC FETs.

For complete application information, please refer to AN1009: Driving MOSFET and IGBT Switches Using the Si828x and AN1306:

Driving SiC FETs Using the Si828x Isolated Gate Driver.

3.1 Recommended Application Circuits

+3.3V

0.1uF

DDSAT

RL

RH

U1

Si8285

VDDA

2

VH

13

CLMP

11

DSAT

15

/FLT

5

/RST

4

VDDB

14

GNDA

1

RDY

6

VL

12

IN+

7

IN-

8

VMID

10

VSSB

9

NC

3

NC

16

MCU

0.1uF

Q1

RDSAT

0.1uF

10uF

Q2

CBL

+ RAIL

- RAIL

Place RDSAT and DDSAT as

close to Q1 as possible

Place CBL as close to DSAT

pin as possible

1kΩ

10kΩ

10kΩ

10uF

100

Figure 3.1. Example Si8285 Application Circuit

MCU

Si8286

GNDA

4

VO

11

VSSB

9

IN-

2

IN+

1

DSAT

14

VDDA

3

VDDB

13

VMID

16

/FLT

6

NC

7

VDDB

12

/RST

5

NC

8

NC

15

VSSB

10

+3.3V

0.1uF

Q1

Q2

+ RAIL

- RAIL

DDSAT

RDSAT

Rg

10uF

0.1uF

CBL

0.1uF

1kΩ 10kΩ

10uF

100

Place RDSAT and DDSAT as

close to Q1 as possible

Place CBL as close to DSAT

pin as possible

Figure 3.2. Example Si8286 Application Circuit

Si8285/86 Data Sheet • Applications Information

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

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Rev. 2.0 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 12, 2021

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