STSR3 datasheet(5/12 Pages) STMICROELECTRONICS

No de pièce	STSR3

Description	SYNCHRONOUS RECTIFIERS SMART DRIVER FOR FLYBACK

PDF	12 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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5 / 12 page

STSR3

5/12

TIMING DIAGRAM

APPLICATION INFORMATION: STSR3 IN FLYBACK CONVERTER SECONDARY SIDE

NOTES

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

2) R1 andR2set theanticipationtimeby partitioning theVCC voltage;

3) R3 and R4 is a resistor divider meant to provide the correct CK voltage range;

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) D3 could be necessary to protect CK pin from voltages higher than VCC.

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

9) A capacitor in parallel with R4 could be necessary to eliminate turn off voltage spike.

+5V

Vout

Vin

+5V

Cout

100nF

STSR3

SGLGND

SETANT

TRANSFORMER

MosfetN

PWM

Feedback

Loop

option

STSR3 Fiches technique(PDF) 5 Page - STMicroelectronics