MIC4930 Datasheet, PDF (11/17 Pages) Micrel Semiconductor – Hyper Speed Control 3A Buck Regulator

Micrel, Inc.
the minimum OFF time limit. When this limit is reached,
the OFF time is no longer reduced, and the MIC4930
smoothly transitions to an ON-time modulation mode. In
the ON-time modulation region, frequency reduces with
the increase of the required ON-time / duty cycle, and
regulation finally takes place on the peak of the FB ripple
waveform.
Note that because of the shift of the regulation threshold
between different modes, line regulation might suffer
when the input voltage and/or duty cycle variations force
the MIC4930 to switch form one regulation mode to the
other. In applications where wide input voltage variations
are expected, ensure that the line regulation is adequate
for the intended application.
MIC4930
March 20, 2014
11
Revision 1.1