STSR30 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STSR30

SYNCHRONOUS RECTIFIER SMART DRIVER FOR FLYBACK

STMicroelectronics 

Figure 1 : TIMING DIAGRAM

STSR30

Figure 2 : STSR30 IN FLYBACK CONVERTER SECONDARY SIDE

Feedback

Loop

TRANSFORMER

Vi

PWM

MosfetN

Cout

C1

100nF

Vo

+5V

+5V R3

D3

8 Ck STSR30

1 INHIBIT

C2

100nF

SGLGND 3

R1

SETANT 7

R2

R5

D1

option

D2 +5V

Low = OFF

High = ON

NOTES

1) Ceramic Capacitors C1 and C2 must be placed very close to the IC;

2) R1 and R2 set the anticipation time by partitioning the VCC voltage;

3) R3 is a pull-up resistor;

4) R5 limits the current flowing through diode D2 when Freewheeling drain voltage is high;

5) D1 could be necessary to protect INHIBIT pin from negative voltages.

6) D2 could be necessary to protect INHIBIT pin from voltages higher than VCC

7) SGLGND layout trace must not include OUTGATE current paths.

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