APW7045 데이터 시트보기 (PDF) - Anpec Electronics

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APW7045

Advanced PWM and Linear Power Controller

Anpec Electronics 

APW7045

Functional Pin Description (Cont.)

OCSET (Pin 12)

PHASE (Pin 15)

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

voltage at this pin is monitored for Power-On Reset

(POR) purpose and pulling this pin low with an open

drain device will shutdown the IC.

PGND (Pin 13)

This is the power ground connection. Tie the syn-

chronous PWM converter’s lower MOSFET source

to this pin.

Connect the PHASE pin to the PWM converter’s up-

per MOSFET source. This pin is used to monitor the

voltage drop across the upper MOSFET for over-cur-

rent protection.

UGATE (Pin 16)

Connect UGATE pin to the PWM converter’s upper

MOSFET gate. This pin provides the gate drive for

the upper MOSFET.

LGATE (Pin 14)

Connect LGATE to the PWM converter’s lower

MOSFET gate. This pin provides the gate drive for

the lower MOSFET.

Simplified Power System Diagram

+3.3 V IN

V MEM

Q3

Linear Controller

PWM

C ontroller

APW 7045

5 .0 V IN

Q1

V TT

Q2

Copyright  ANPEC Electronics Corp.

6

Rev.A.5 - Jan., 2003

www.anpec.com.tw

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