Copyright

© ANPEC Electronics Corp.

Rev. A.1 - Feb., 2006

APW7071

www.anpec.com.tw

2

Pin Description

No

Name

Function

1

SW

Switch Pin. Connect to inductor/diode here. Minimize trace area at this

pin to educe EMI.

2

GND

Ground Pin.

3

FB

Feedback Pin. Reference voltage is 0.25V. Connect cathode of

lowest LED and resistor here. Calculate resistor value according to

RFB = 0.25V/l LED

4

SHDN

Shutdown Pin. Tie to 1.3V or higher to enable device, 0.4V or less to

disable.

5

OVP

Over voltage protection sense pin. Connect this pin to VOUT for over

voltage protection.

6

Vin

Supply voltage Pin.

Block Diagram

Under

Voltage

Lockout

Gate

Driver

Control

Logic

400ns Min.

off-time

Soft

start

6us Max.

on-time

-

+

-

+

OVP

Vref=0.25V

FB(3)

SHDN(4)

GND(2)

VIN(6)

SW(1)

RSENSE

N-MOSFET

Current Limit

Error

Comparator

OVP(5)

-

+

Thermal

Shutdown