IR3651SPBF datasheet(4/19 Pages) IRF | HIGH VOLTAGE SYNCHRONOUS PWM BUCK CONTROLLER

4 / 19 page

IR3651SPbF

10/11/2006

Pin Description

Pin Name

Description

Inverting input to the error amplifier. This pin is connected directly to the

output of the regulator via resistor divider to set the output voltage and

provide feedback to the error amplifier.

Comp

Output of error amplifier. An external resistor and capacitor network is

typically connected from this pin to ground to provide loop compensation.

SS/SD

Soft start / shutdown. This pin provides user programmable soft-start

function. Connect an external capacitor from this pin to ground to set the

start up time of the output voltage. The converter can be shutdown by

pulling this pin below 0.3V.

SYNC

The internal oscillator can be synchronized to an external clock via this

pin.

PGnd

Power Ground. This pin serves as a separate ground for the MOSFET

driver and should be connected to the system’s power ground plane.

LDrv

Output driver for low side MOSFET.

DRVcc

This pin provides biasing for the internal low side driver. A minimum of

0.1uF, high frequency capacitor must be connected from this pin to power

ground.

This pin powers the high side driver and must be connected to a voltage

higher than bus voltage. A minimum of 0.1uF, high frequency capacitor

must be connected from this pin to switch node.

HDrv

Output driver for high side MOSFET

Switch node. Connect this pin to the source of the upper MOSFET and

the drain of the lower MOSFET. This pin is return path for the upper gate

driver.

Vcc

This pin provides power for the internal blocks of the IC. A minimum of

0.1uF, high frequency capacitor must be connected from this pin to

ground.

OCSet

Current limit set point. A resistor from this pin to drain of low side

MOSFET will set the current limit threshold.

Gnd

Signal ground for internal reference and control circuitry.

Connecting a resistor from this pin to ground sets the oscillator frequency.

IR3651SPBF Datasheet(PDF) 4 Page - International Rectifier

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