APW7067N データシートの表示（PDF） - Anpec Electronics

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APW7067N

Synchronous Buck PWM and Linear Controller

Anpec Electronics 

APW7067N

Function Pin Description

VCC12

Power supply input pin. Connect a nominal 12V power

supply to this pin. The power-on reset function monitors

the input voltage at this pin. It is recommended that a

decoupling capacitor (1 to 10µF) be connected to GND for

noise decoupling.

BOOT

This pin provides the bootstrap voltage to the upper gate

driver for driving the N-channel MOSFET. An external ca-

pacitor from PHASE to BOOT, an internal diode, and the

power supply valtage VCC12, generates the bootstrap volt-

age for the upper gate diver (UGATE).

PHASE

This pin is the return path for the upper gate driver. Con-

nect this pin to the upper MOSFET source, and connect a

capacitor to BOOT for the bootstrap voltage. This pin is

also used to monitor the voltage drop across the lower

MOSFET for over-current protection.

GND

This pin is the signal ground pin. Connect the GND pin to

a good ground plane.

PGND

This pin is the power ground pin for the lower gate driver.

It should be tied to GND pin on the board.

COMP

This pin is the output of PWM error amplifier. It is used to

set the compensation components.

FB

This pin is the inverting input of the PWM error amplifier.

It is used to set the output voltage and the compensation

components. This pin is also monitored for under-

voltage protection, when the FB voltage is under 50% of

reference voltage (0.4V), both outputs will be shut

- downed immediately.

UGATE

This pin is the gate driver for the upper MOSFET of PWM

output.

LGATE

This pin is the gate driver for the lower MOSFET of PWM

output.

DRIVE

This pin drives the gate of an external N-channel MOSFET

for linear regulator. It is also used to set the compensa-

tion for some specific applications, for example, with

low values of output capacitance and ESR.

FBL

This pin is the inverting input of the linear regulator error

amplifier. It is used to set the output voltage. This pin is

also monitored for under-voltage protection, when the

FBL voltage is under 50% of reference voltage

(0.4V), both outputs will be shutdown immediately.

FS_DIS

This pin be allowed to adjust the switching frequency.

Connect a resistor from FS_DIS pin to the ground to

increase the switching frequency. This pin also provides

shutdown function, use an open drain logic signal to pull

this pin low to disable both outputs, leave open to enable

both outputs.

Copyright © ANPEC Electronics Corp.

10

Rev. A.3 - Mar., 2008

www.anpec.com.tw

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