STSR2CD-TR Просмотр технического описания (PDF) - STMicroelectronics

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STSR2CD-TR

FORWARD SYNCHRONOUS RECTIFIERS SMART DRIVER

STMicroelectronics 

TIMING DIAGRAM

STSR2

APPLICATION INFORMATION: STSR2 IN FORWARD CONVERTER SECONDARY SIDE

Vin

Feedback

Loop

TRANSFORMER

PWM

MosfetN

Q1

MosfetN

Q2

INDUCTOR

Cout

100nF

Vout

+5V

100nF

R1

SGLGND 6

STSR2

D1

option

SETANT 3

R2

R3

Ck 4

D3

R4

+5V

R5

D2

+5V

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 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 OUTGATE1,2 current paths.

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

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