Running cool and fast with the active clamp flyback
by Michael O’Loughlin, Systems Application and Design Engineer, High-Voltage PWM Controller Product Group, Texas Instruments, Electronic Products, Jul 20 2018
Focus:
By recycling transformer leakage energy (rather than dissipating it with passive clamping) and
by enabling zero-voltage switching, the active clamp flyback converter reduces power losses
that increase with switching frequency for the conventional quasi-resonant flyback converter.
This allows flyback converters to switch at higher frequencies (above 100 kHz), shrinking
magnetics and the overall size of the power supply. This short article explains how the active
clamp flyback reduces losses and introduces a controller IC, TI’s UCC28780, which was developed
to simplify design of the active clamp flyback converter.
What you’ll learn:
- How to achieve higher switching frequencies without increasing power losses using the active clamp flyback converter
- How to understand the benefits of the newer active clamp flyback versus the standard quasi resonant flyback converter
- How to shrink ac-dc adapter size by using the active clamp flyback converter
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