AP1605

PWM/PFM DUAL-MODE STEP-DOWN SWITCHING

REGULATOR

AP1605 Rev. 2

6 of 8

FEBRUARY 2009

www.diodes.com

Test Circuit

Functional Description

PWM/PFM Control (AP1605 Series)

The AP1605 consists of DC/DC converters that employ a PWM/PFM auto-switch system.

In converters of the AP1605, the PFM mode varies in a range of duty cycle from 0% to 25%, and the PWM mode varies in a range of duty

cycle from 25% to 100% according to the load current, and yet 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.