APW7065C Ver la hoja de datos (PDF) - Anpec Electronics

Número de pieza

componentes Descripción

Fabricante

APW7065C

Synchronous Buck PWM Controller

Anpec Electronics 

APW7065C

Function Description

BOOT (Pin 1)

A bootstrap circuit with a diode connected to VCC is used

to create a voltage suitable to drive a logic-level N-chan-

nel MOSFET.

COMP (Pin 7)

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

set the compensation components. In addition, if the pin

is pulled below 1.2V, it will disable the device.

UGATE (Pin 2)

PHASE (Pin 8)

Connect this pin to the high-side N-channel MOSFET’s

gate. This pin provides gate drive for the high-side

MOSFET.

GND (Pin 3)

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

nect this pin to the upper MOSFET source. This pin is

also used to monitor the voltage drop across the MOSFET

for over-current protection.

The GND terminal provides return path for the IC’s bias

current and the low-side MOSFET driver’s pull-low current.

Connect the pin to the system ground via very low imped-

ance layout on PCBs.

LGATE (Pin 4)

Connect this pin to the low-side N-channel MOSFET’s

gate. This pin provides gate drive for the low-side

MOSFET.

VCC (Pin 5)

Connect this pin to a 12V supply voltage. This pin pro-

vides bias supply for the control circuitry and the low-side

MOSFET driver. The voltage at this pin is monitored for

the Power-On-Reset (POR) purpose. It is recommended

that a decoupling capacitor (1 to 10µF) be connected to

GND for noise decoupling.

FB (Pin 6)

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

Connect this pin to the output (V ) of the converter via an

OUT

external resistor divider for closed-loop operation. The

output voltage set by the resistor divider is determined

using the following formula :

VOUT

= 0.8 × 1+



R1 

R2 

where R1 is the resistor connected from VOUT to FB , and

R2 is the resistor connected from FB to GND. The FB pin

is also monitored for under voltage events.

Copyright © ANPEC Electronics Corp.

8

Rev. A.2 - Mar., 2008

www.anpec.com.tw

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