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IR3651SPBF Datasheet(PDF) 4 Page - International Rectifier

Part No. IR3651SPBF
Description  HIGH VOLTAGE SYNCHRONOUS PWM BUCK CONTROLLER
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Maker  IRF [International Rectifier]
Homepage  http://www.irf.com
Logo IRF - International Rectifier

IR3651SPBF Datasheet(HTML) 4 Page - International Rectifier

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IR3651SPbF
10/11/2006
Pin Description
Pin Name
Description
1
Fb
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.
2
Comp
Output of error amplifier. An external resistor and capacitor network is
typically connected from this pin to ground to provide loop compensation.
3
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.
4
SYNC
The internal oscillator can be synchronized to an external clock via this
pin.
5
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.
6
LDrv
Output driver for low side MOSFET.
7
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.
8
Vb
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.
9
HDrv
Output driver for high side MOSFET
10
Vs
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.
11
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.
12
OCSet
Current limit set point. A resistor from this pin to drain of low side
MOSFET will set the current limit threshold.
13
Gnd
Signal ground for internal reference and control circuitry.
14
Rt
Connecting a resistor from this pin to ground sets the oscillator frequency.
4


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