SS9176 datasheet(9/12 Pages) SSC

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SS9175/6

Current sharing application using SS9175CS

This current-sharing circuit is implemented using

SS9175CS. The dual phase MOSFETs can be

supplied from different supply voltages (in this case,

from 12V for channel 2, and 5V for channel 1).

They can be supplied from the same supply

voltage, too. As there is only a single output

voltage (1.4V in this case), the divided voltage is

fed back to the IN1 pin. The VCC supply voltage

can be either 12V or 5V, depending on the

convenience of PCB layout, but VCC = 12V is

recommended. If VCC > 6.5V, the BSTC output is

fixed at 6V. This BSTC voltage is used as the

supply voltage for the bootstrap circuit’s diodes

input. A 10uF capacitor is recommended for BSTC

decoupling. A 1k resistor is connected from CL2+

to the MOSFET’s high-side voltage. This 1k

resistor is used to program the OCP level.

12V

1.4v

PWRG

CL1+

CL1-

DH1

DL1

BST1

PGND

COMP1

VCC

PWRGD

IN1

CL2+

CL2-

DH2

DL2

BST2

BSTC

COMP2

SS/ENB

GND

IN2

1uF

7.5uH

2.2pF

450uF

0.22uF

50k

10uF

APPLICATION INFORMATION (cont.)

Rev.2.02 12/29/2003

PRELIMINARY

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