APW7199 查看數據表（PDF） - Anpec Electronics

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APW7199

High-Performance Step-Down PWM Controller with PFM

Anpec Electronics 

APW7199

Pin Description

PIN

NO.

NAME

FUNCTION

This pin provides ground referenced bias voltage to the high-side MOSFET driver. A bootstrap

1

BOOT

circuit with a diode connected to 5V is used to create a voltage suitable to drive a logic-level

N-channel MOSFET.

2

UGATE

Connect this pin to the high-side N-channel MOSFET’s gate. This pin provides gate drive for the

high-side MOSFET.

3

PHASE

The pin provides return path for the high-side MOSFET driver’s pull-low current. Connect this pin

to the high-side MOSFET’s source.

The GND terminal provides return path for the IC’s bias current and the low-side MOSFET

4

GND

driver’s pull-low current. Connect the pin to the system ground via very low impedance layout on

PCBs.

5

LGATE/OCSET

Low-side Gate Driver Output and Over-Current Setting Input. This pin is the gate driver for

low-side MOSFET.

Connect this pin to a 5V supply voltage. This pin provides bias supply for the control circuitry and

6

VCC

the low-side MOSFET driver. The voltage at this pin is monitored for the Power-On-Reset (POR)

purpose. Decoupling capacitor (4.7µF) be connected to GND for noise decoupling.

Output Voltage Feedback pin. This pin is connected to the resistive divider that set the desired

7

FB

output voltage. The POK, UVP, and OVP circuits detect this signal to report output voltage

status.

8

VOUT

The VOUT pin makes a direct measurement of the converter output voltage. The VOUT pin

should be connected to the top feedback resistor at the converter output.

9

POK

POK is an open drain output used to indicate the status of the output voltage. Connect the POK

pin to +5V through a pull-high resistor.

10

EN/EXTREF Enable/Shutdown Pin or External Reference Selection of The PWM Controller.

Copyright © ANPEC Electronics Corp.

11

Rev. A.4 - Oct., 2010

www.anpec.com.tw

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