APW7026 데이터 시트보기 (PDF) - Anpec Electronics

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APW7026

Advanced PWM and Dual Linear Power Controllers

Anpec Electronics 

APW7026

Functional Pin Description Cont.

V = OUT2

( 1+

ROUT2

RGND2

) x VREF2

The value of the resistor connected from VOUT2 to FB2 must

be less than 150Ω .

V5 (Pin 8)

The +5V input voltage at this pin is monitored for power-on

reset (POR) purpose.

SS (Pin 9)

This pin provides the soft-start for the all PWM converters

and linear regulator . An internal resistor charges an

external capacitor that is connected from 5V supply to

this pin which ramps up the all outputs , preventing the

outputs from overshooting as well as limiting the input

current . The second function of the soft-start cap is to

provides long off time for the synchronous MOSFET during

current limiting .

FAULT / RT (Pin 10)

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.

V3.3 (Pin 11)

This pin is connected to the +3.3V or the output of the

ASYNC PWM converter for power good and

over-voltage detection. When the output voltage of the

ASYNC PWM converter is not in the range from 3V to

4V, connect this pin to +3.3V voltage.

GND (Pin 12)

Signal ground for the IC. All voltage levels are measured

with respect to this pin.

GATE (Pin 13)

Connect this pin to the gate of an external MOSFET.

This pin provides the drive for the linear regulator’s

pass MOSFET.

FB3 (Pin 14)

Connect this pin to the output of the linear regulator . A

resistor driver is connected from this pin to VOUT3 and

GND that sets the output voltage as same as V . This

OUT2

pin is monitored for power good function.

FB1 (Pin 15)

This pin provides the feedback for the SYNC PWM

converter. Typically this pin can be connected directly to

the output of the converter . However , a resistor

divider is recommended to be connected from this pin to

VOUT1 and GND to adjust the output voltage as same as

VOUT2. The value of the resistor connected from VOUT1 to

FB1 must be less than 200Ω.

VSEN1 (Pin 16)

This pin is connected to the SYNC PWM converter’s

output voltage . The PGOOD and OVP comparator

cicuits use this signal to report output voltage status

and over-voltage protection.

OCSET1 (Pin 17)

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

the SYNC PWM converter’s upper MOSFET . The

over-current (OC) trip point for the SYNC PWM

converter is set by the ROCSET as same as the OCSET2.

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

PGND (Pin 18)

This is the power ground connection . Tie the SYNC

PWM converter’s lower MOSFET source to this pin.

LGATE1 (Pin 19)

Connect LGATE1 to the SYNC PWM converter’s lower

MOSFET gate . This pin provides the gate drive for the

lower MOSFET.

PHASE1 (Pin 20)

Connect the PHASE1 pin to the SYNC PWM

Converter’s upper MOSFET source. This pin is used

to monitor the voltage drop across the upper MOSFET

for over-current protection.

Copyright  ANPEC Electronics Corp.

5

Rev. A.2 - Sep., 2001

www.anpec.com.tw

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