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APW703615KC-TU

Advanced Dual PWM Power Controller

Anpec Electronics 

APW7036

Functional Pin Description Cont.

(OC) trip point according to the following equation:

I=

PEAK

IOCSET * ROCSET

rDS(ON)

synchronous PWM regulator error amplifier. The FB1

pin is the inverting input of the error amplifier. Simi-

larly , the COMP pin is the error amplifier output. These

pins are used to compensate the voltage-mode con-

trol feedback loop of the synchronous PWM converter.

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

VSEN (Pin 16)

FB2 (Pin 7)

This pin provides the feedback for the non-synchro-

nous switching regulator. A resistor driver is con-

nected from this pin to regulator output and GND that

sets the output voltage. The value of the resistor con-

nected from regulator output to FB2 must be less than

150Ω .

SS (Pin 8)

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.

PGND (Pin 18)

This is the power ground connection. Tie the syn-

chronous PWM converter’s lower MOSFET source to

this pin.

Connect a capacitor from this pin to ground. This

capacitor , along with an internal 28µA current source

, sets the soft-start interval of the converter.

FAULT / RT (Pin 9)

LGATE (Pin19)

Connect LGATE to the synchronous PWM converter’s

lower MOSFET gate. This pin provides the gate drive

for the lower MOSFET.

This pin provides oscillator switching frequency

adjustment. By placing a resistor (RT ) from this pin

to GND , the nominal 200kHz switching frequency is

increased. Conversely , connecting a pull-up resistor

(RT ) from this pin to VCC reduces the switching

frequency.

Nominally , the voltage at this pin is 1.26V. In the

event of an over-voltage or over-current condition , this

pin is internally pulled to VCC.

PHASE1 (Pin 20)

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.

VAUX (Pin 11)

The +3.3V input voltage at this pin is monitored for

power-on reset (POR) purposes.

GND (Pin 12)

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

sured with respect to this pin.

COMP and FB1 (Pins 14 , and 15)

COMP and FB1 are the available external pins of the

Copyright  ANPEC Electronics Corp.

5

Rev. A.1 - May, 2001

www.anpec.com.tw

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