APW6021 datasheet(7/13 Pages) ANPEC

7 / 13 page

Rev. P.4 - Mar., 2001

APW6021

www.anpec.com.tw

DRIVE3 (Pin 18)

Connect this pin to the gate of an external MOSFET.

This pin provides the drive for the 1.5V regulator’s

pass transistor.

VSEN3 (Pin 19)

Connect this pin to the output of the 1.5V linear

regulator. This pin is monitored for under-voltage

events.

COMP and FB (Pin 20, and 21)

COMP and FB are the available external pins of the

PWM converter error amplifier. The FB pin is the in-

verting input of the error amplifier. Similarly, the COMP

pin is the error amplifier output. These pins are used

to compensate the voltage-mode control feedback

loop of the synchronous PWM converter.

VSEN1 (Pin 22)

This pin is connected to the PWM converter’s output

voltage. The PGOOD and OVP comparator circuits

use this signal to report output voltage status and for

over- voltage protection.

OCSET (Pin 23)

Connect a resistor from this pin to the drain of the

respective upper MOSFET. This resistor, an internal

200

µA current source, and the upper MOSFET’s on-

resistance set the converter over-current trip point.

An over-current trip cycles the soft-start function.

The voltage at this pin is monitored for power-on re-

set (POR) purposes and pulling this pin low with an

open drain device will shutdown the IC.

PGND (Pin 24)

This is the power ground connection. Tie the syn-

chronous PWM converter’s lower MOSFET source

to this pin.

Functional Pin Description Cont.

LGATE (Pin 25)

Connect LGATE to the PWM converter’s lower

MOSFET gate. This pin provides the gate drive for

the lower MOSFET.

PHASE (Pin 26)

Connect the PHASE pin to the PWM converter’s up-

per MOSFET source. This pin represents the gate

drive return current path and is used to monitor the

voltage drop across the upper MOSFET for over-cur-

rent protection.

UGATE (Pin 27)

Connect UGATE pin to the PWM converter’s upper

MOSFET gate. This pin provides the gate drive for

the upper MOSFET.

VCC (Pin 28)

Provide a 12V bias supply for the IC to this pin. This

pin also provides the gate bias charge for all the

MOSFETs controlled by the IC. The voltage at this

pin is monitored for Power-On Reset (POR) purposes.

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