AP1530

PWM CONTROL 3A STEP-DOWN CONVERTER

AP1530 Rev. 1

7 of 8

MARCH 2007

www.diodes.com

Function Description

PWM Control

The AP1530 consists of DC/DC converters that employ a

pulse-width modulation (PWM) system.

In converters of the AP1530, 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 AP1530 assures that the

high-side MOSFET driver outputs remain in the off state

whenever the supply voltage drops below 3.3V. Normal operation

The current limit threshold is set by the external resistor

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.

Internal code

Year: "01" =2001

"02" =2002

Xth week: 01~52

14

AP1530

YY WW X

Device

Package

Identification Code

AP1530S

SOP-8L

AP1530