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A small-signal model of the hysteretic comparator in linear-carrier self-oscillating switch-mode controllers
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| Author(s) |
M.C.W. Høyerby; M.A.E. Andersen |
| Abstract |
This paper presents a small-signal model for the
hysteretic comparator, a vital but not very well-understood
component often used in controllers for high-performance
switching power converters. It will be shown that
comparator/power stage delay is the key limiting factor on loop
gain in linear-carrier hysteretic controllers, which is ideally
infinite at DC. The reasoning behind the model is explained, and
the model is verified against simulated and measured gain-phase
plots. The presented model allows precise calculation of the LF
loop gain in the linear-carrier class of self-oscillating hysteretic
controllers, which is particularly useful in the design of switching
amplifiers. |
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| Filename: | Unnamed file |
| Filesize: | 464.6 KB |
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| Type |
Members Only |
| Date |
Last modified 2006-11-27 by System |
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