SI786CSG datasheet(10/14 Pages) VISHAY

10 / 14 page

Si786

Vishay Siliconix

www.vishay.com

Document Number: 70189

S-40807—Rev. J, 26-Apr-04

SCHEMATIC DRAWINGS

COMPARATOR SUPPLY INPUT

CS3

FB3

SS5

Si786

DH5

ON3

LX3

BST3

DL5

V+

FB5

GND

PGND

REF

DL3

SYNC

BST5

SHDN

ON5

SS3

LX5

DH3

CS5

D1FS4

(Note 1)

D1FS4

(Note 1)

INPUT

5.5 V to 30 V

3.3 V

at 3 A

150 mF

C12

150 mF

25 mW

10 mH

D2A

1N4148

D2B

1N4148

0.1 mF

22 mF

C10

22 mF

10 mF

5 V at 5 mA

5 V at

3 A

330 mF

25 mW

10 mH

0.01 mF

3.3 V ON/OFF

5 V ON/OFF

SHUTDOWN

OSC SYNC

OUT

COMPARATOR 1

COMPARATOR 2

3.3 V at 5 mA

1 mF

FIGURE 1.

Si786 Application Circuit

Note 1: Use short, Kelvin-connected

PC board traces placed very

close to one another.

0.1 mF

100 W

FIGURE 2.

Si786 Block Diagram

5-V LDO

Linear

Regulator

3.3-V

Reference

300 kHz/200 kHz

Oscillator

3.3-V

PWM

Controller

(See Figure 3)

5-V

PWM

Controller

(See Figure 3)

STANDBY

FB3

CS3

BST3

DH3

LX3

DL3

SS3

ON3

ON5

PGND

FB5

CS5

BST5

DH5

LX5

DL5

SS5

V+

REF

SHDN

SYNC

1.65 V

4.5 V

4 V

2.8 V

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