APW7071(2008) 데이터 시트보기 (PDF) - Anpec Electronics

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APW7071
(Rev.:2008)

Step-Up Converter for 4 Series White LEDs Driver

Anpec Electronics 

APW7071

Pin Description

NO

NAME

FUNCTION

1

SW

Switch Pin. Connect this pin to inductor/diode here.

2

GND

Ground Pin.

3

FB

Feedback Pin. Reference voltage is 0.25V. Connect this pin to cathode of lowest LED and resistor

(RFB). Calculate resistor value according to RFB = 0.25V/lLED

4

SHDN

Shutdown Pin. Pulling this pin to ground forces the device into shutdown mode reducing the supply

current to less than 1µA. This pin should not be left floating.

5

OVP

Over voltage protection sense pin. Connect this pin to output capacitor. Left it unconnected to disable

OVP function.

6

VIN

Supply voltage Pin.

Block Diagram

VIN 6

FB 3

400ns Min.

off-time

Under

Voltage

Lockout

Error Comparator

VREF=0.25V

OVP

5

OVP

SHDN

Comparator

1 SW

Control

Logic

Gate

Driver

N-MOSFET

6µs Max.

on-time

SHDN 4

Current Limit

RSENSE

Soft

start

2

GND

Copyright © ANPEC Electronics Corp.

6

Rev. A.3 - Jul., 2008

www.anpec.com.tw

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