AP1513

PWM Control 2A Step-Down Converter

Anachip Corp.

www.anachip.com.tw

Rev. 1.3 Nov 17, 2005

6/7

Function Description

PWM Control

The AP1513 consists of DC/DC converters that

employ a pulse-width modulation (PWM) system.

In converters of the AP1513, the pulse width varies

in a range from 0 to 100%, according to the load

current. The ripple voltage produced by the

switching can easily be removed through a filter

because the switching frequency remains constant.

Therefore, these converters provide a low-ripple

power over broad ranges of input voltage and load

current.

Under Voltage Lockout

The under voltage lockout circuit of the AP1513

assures that the high-side MOSFET driver outputs

remain in the off state whenever the supply voltage

drops below 3.3V. Normal operation resumes once

The current limit threshold is setting by the external

internal 100uA sink current crossing the resistor

sets the voltage at the pin of OCSET. When the

PWM voltage is less than the voltage at OCSET, an

over-current condition is triggered.

R

I

R

I

OCSET

OCSET

DS(ON)

LOAD

×

=

×

See above formula for setting the current limit

value.

Marking Information

8

5

( Top View )

Logo

Part no.

ID code: internal

Year: "01" =2001

"02" =2002

Xth week: 01~52

14

AP1513

YY WW X