APW7073A データシートの表示（PDF） - Anpec Electronics

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APW7073A

Synchronous Buck PWM Controller

Anpec Electronics 

APW7073A

Function Pin Description

VCC

Power supply input pin. Connect a nominal 12V power

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

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

decoupling capacitor (1 to 10µF) be connected to the

GND for noise decoupling.

PVCC

This pin provides a supply voltage for the lower gate

drive. Connect this pin to VCC pin in normal use.

BOOT

This pin provides the bootstrap voltage to the upper gate

driver for driving the N-channel MOSFET.

PHASE

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

Connect this pin to the upper MOSFET source. This pin

is also used to monitor the voltage drop across the

MOSFET for over-current protection.

GND

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

good ground plane.

PGND

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

It should be tied to the GND 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.

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.

SS

Connect a capacitor to the GND and a 30µA current source

charges this capacitor to set the soft-start time.

OCSET

This pin serves two functions: a shutdown control and

the setting of over current limit threshold. Pulling this pin

below 1.3V will shutdown the controller, forcing the

UGATE and LGATE signals to be low.

A resistor (Rocset) connected between this pin and the

drain of the high side MOSFET will determine the over

current limit. An internal 200µA current source will flow

through this resistor, creating a voltage drop, which will

be compared with the voltage across the high side

MOSFET. The threshold of the over current limit is

therefore given by:

IPEAK

=

IOCSET (200uA ) × ROCSET

RDS(ON)

EN

Pull this pin above 1.3V to enable the device and pull

this pin below 1.2V to disable the device. In shutdown,

the SS is discharged and the UGATE and LGATE pins

are held low. Note that don’t leave this pin open.

RT

This pin allows adjusting the switching frequency.

Connect a resistor from RT pin to the ground to increase

the switching frequency. Conversely, connect a resistor

from RT to the VCC to decrease the switching frequency.

Copyright © ANPEC Electronics Corp.

8

Rev. A.5 - Nov., 2012

www.anpec.com.tw

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