參數(shù)資料
型號(hào)： IR3651STRPBF
廠商： International Rectifier
英文描述： HIGH VOLTAGE SYNCHRONOUS PWM BUCK CONTROLLER
中文描述： 高壓同步PWM降壓控制器
文件頁(yè)數(shù)： 4/19頁(yè)
文件大?。?/td> 397K
代理商： IR3651STRPBF
IR3651SP
b
F
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.
Output of error amplifier. An external resistor and capacitor network is
typically connected from this pin to ground to provide loop compensation.
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.
The internal oscillator can be synchronized to an external clock via this
pin.
Power Ground. This pin serves as a separate ground for the MOSFET
driver and should be connected to the system’s power ground plane.
2
Comp
3
SS/SD
4
SYNC
5
PGnd
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.
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.
Output driver for high side MOSFET
8
Vb
9
HDrv
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.
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.
Current limit set point. A resistor from this pin to drain of low side
MOSFET will set the current limit threshold.
11
Vcc
12
OCSet
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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