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APW6020

Advanced Dual PWM and Dual Linear Power Controllers

Anpec Electronics 

APW6020

Functional Pin Description Cont.

power-on reset (POR) purposes.

GND (Pin 17)

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

voltage at OCSET1 pin is monitored for power-on

reset (POR) purposes.

Signal ground for the IC. All voltage levels are mea-

sured with respect to this pin.

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.

COMP1 and FB1 (Pins 20 , and 21)

COMP1 and FB1 are the available external pins of

the synchronous PWM regulator error amplifier. The

FB1 pin is the inverting input of the error amplifier.

Similarly , the COMP1 pin is the error amplifier output.

These pins are used to compensate the voltage-mode

control feedback loop of the synchronous PWM

converter.

PGND (Pin 24)

This is the power ground connection. Tie the syn-

chronous PWM converter’s lower MOSFET source

to this pin.

LGATE1 (Pin 25)

Connect LGATE1 to the synchronous PWM

converter’s lower MOSFET gate. This pin provides

the gate drive for the lower MOSFET.

PHASE1 (Pin 26)

Connect the PHASE1 pin to the synchronous PWM

converter’s upper MOSFET source. This pin is used

to monitor the voltage drop across the upper MOSFET

for over-current protection.

UGATE1 (Pin 27)

Connect UGATE1 pin to the synchronous PWM

converter’s upper MOSFET gate. This pin provides

the gate drive for the upper MOSFET.

VSEN1 (Pin 22)

VCC (Pin 28)

This pin is connected to the synchronous PWM

converters’s output voltage. The PGOOD and OVP

comparator circuits use this signal to report output

voltage status and for over-voltage protection.

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.

OCSET1 (Pin 23)

Connect a resistor (ROCSET ) from this pin to the drain

of the synchronous PWM converter’s upper MOSFET.

ROCSET , an internal 200µA current source (IOCSET ) ,

and the MOSFET’s on-resistance(rDS(ON)) set the con-

verter over-current (OC) trip point according to the

following equation :

I=

PEAK

I *R

OCSET

OCSET

r

DS(ON)

Copyright  ANPEC Electronics Corp.

6

Rev. A.2 - May, 2001

www.anpec.com.tw

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