April 2011
Intermediate to advanced
400 pages
16h 50m
English
Content preview from Power Sources and Supplies: World Class Designs
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Chapter 4
4.1 Basic Control Circuits
The simplest form of control circuit is variable frequency/constant on-time or pulse
frequency modulation (PFM). In Figure 4.1 , the oscillator has a constant on-time
(basically a one-shot multivibrator similar to a 555 timer). As soon as the control voltage
drops below the reference, the oscillator is triggered to turn on by the comparator. Under
light loads, the frequency is low and the duty cycle is low. As the load increases, the
frequency increases. The maximum frequency occurs at 50% duty cycle. The wide range
of ripple frequency can cause problems for electromagnetic compatibility ...
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