Copyright  ANPEC Electronics Corp.

Rev. A.2 - Sep., 2001

APW7026

www.anpec.com.tw

4

Electrical Characteristics Cont.

Functional Pin Description

1. Recommended operating conditions, Unless otherwise noted.

2. Refer to Block and Simplified Power System Diagrams , and Typical Application Schematic.

AP W 7 0 2 6

U n i t

S y m b ol

P a r a m e t e r

T e s t C ondi t i ons

Mi n

T y p

Ma x

PR O T EC T I O N

VS EN 1 R i s i n g

11 8

%

V S E N 1 O . V . H y s t er es i s

2%

V 3 . 3 O . V . t r i p po i n t

V 3. 3 R i s i ng

4. 1

V

V 3 . 3 O . V . H y s t er es i s

0. 1

V

F A U L T S o ur i n g C u r r e n t

25

m A

O C S E T 1, 2 C u r r e n t S o ur c e

V o c s e t = 4. 5V

170

200

230

uA

P u l l u p r e si st o r t o 5 V

23

K

Ω

P O W E R

GOOD

VS EN 1 U p p e r T h r e s h o l d

VS EN 1 R i s i n g

1 1 0

%

V S E N 1 Low er T h r e s h o l d

V S E N 1 R i s i ng

94

%

V S E N 1 P G D H y s t er esi s

U pper / L ow er T h r e s h o l d

2

%

V 3 . 3 Low er T h r e s h o l d

V 3. 3 R i s i ng

2. 5

V

V3 . 3 PG D H y s t e r e s i s

0. 1

V

FB 3 L o w e r Th r e s h o l d

1. 0

V

F B 3 P G D H y s t er es i s

0. 1

V

P G OOD V o l t a g e L o w

0 . 8

V

UGATE1 (Pin 1)

Connect UGATE1 pin to the SYNC PWM Converter’s

upper MOSFET gate .This pin provides the gate drive

for the upper MOSFET.

VCC (Pin 2)

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) purpose.

UGATE2 (Pin 3)

Connect UGATE2 pin to the ASYNC PWM converter’s

MOSFET gate . This pin provides the gate drive for the

MOSFET.

PHASE2 (Pin 4)

Connect the PHASE2 pin to the

ASYNC

PWM

converter’s MOSFET source. This pin is used to monitor

the voltage drop across the MOSFET for over-current

protection.

PGOOD (Pin 5)

PGOOD is an open drain output used to indicate the

status of the output voltages. This pin is pulled low when

the SYNC PWM regulator output is not within ± 10%

of the reference voltage (V

when V3.3 or V

FB3

is

below its lower power good threshold.

OCSET2 (Pin 6)

Connect a resistor (R

the ASYNC PWM converter’s MOSFET . R

internal

200

, and the

MOSFET’s on-resistance (r

set the converter’s

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

equation:

I

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

FB2 (Pin 7)

Connect this pin to the output of the ASYNC PWM

converter . The voltage at this pin is regulated to the

reference voltage V

A resistor driver is connected

from this pin to V

the output voltage as the following equation :

I

r

DS(ON)