Manual

AP1605
PWM/PFM DUAL-MODE STEP-DOWN SWITCHING
REGULATOR
AP1605 Rev. 2 6 of 8 FEBRUARY 2009
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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.