APW6020 Просмотр технического описания (PDF) - Anpec Electronics

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APW6020

Advanced Dual PWM and Dual Linear Power Controllers

Anpec Electronics 

APW6020

Functional Pin Description

UGATE2 (Pin 1)

VSEN2 (Pin 10)

Connect UGATE2 pin to the standard BUCK PWM

converter’s MOSFET gate. This pin provides the gate

drive for the MOSFET.

PHASE2 (Pin 2)

Connect this pin to the output of the standard Buck

PWM converter. The voltage at this pin is regulated

to the level predetermined by the logic-level status of

the SELECT pin. This pin is also monitored by the

PGOOD comparator circuit.

Connect the PHASE2 pin to the standard BUCK PWM

converter’s MOSFET source. This pin is used to

monitor the voltage drop across the MOSFET for

over-current protection.

VID0 , VID1 , VID2 , VID3 , VID4 (Pins 7, 6 , 5 , 4 and

3)

VID0-4 are the TTL-compatible input pins to the 5-bit

DAC. The logic states of these five pins program the

internal voltage reference (DACOUT). The level of

DACOUT sets the microprocessor core converter

output voltage , as well as the coresponding PGOOD

and OVP thresholds.

SELECT (Pin 11)

This pin determines the output voltage of the AGP

bus switching regulator. A low TTL input sets the

output voltage to 1.5V , while a high input sets the

output voltage to 3.3V.

SS (Pin 12)

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 13)

PGOOD (Pin 8)

PGOOD is an open drain output used to indicate the

status of the output voltages. This pin is pulled low

when the synchronous regulator output is not within

10% of the DACOUT reference voltage or when any

of the other outputs are below their under-voltage

thresholds.

The PGOOD output is open for ‘11111’ VID code.

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 resis-

tor (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.

OCSET2 (Pin 9)

VSEN4 (Pin 14)

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

of the standard BUCK converter’s MOSFET. R ,

OCSET

an internal 200µA current source (IOCSET ) , and the

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

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

ing equation :

I=

PEAK

IOCSET * ROCSET

r

DS(ON)

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

Connect this pin to the output of the linear 1.8V

regulator. This pin is monitored for under-voltage

events.

DRIVE4 (Pin 15)

Connect this pin to the gate of an external MOSFET.

This pin provides the drive for the 1.8V regulator’s

pass transistor.

VAUX (Pin 16)

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

Copyright  ANPEC Electronics Corp.

5

Rev. A.2 - May, 2001

www.anpec.com.tw

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