Load transient asynchronous boost for pulse width modulation modulator
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United States of America Patent
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Nov 8, 2016
Grant Date -
Sep 10, 2015
app pub date -
Nov 15, 2013
filing date -
Nov 19, 2012
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Abstract
A pulse width modulation controller (PWM) is disclosed which has a MOSFET (15) responsive to the error voltage (Verror) signal from the PWM amplifier (17) to detect a transient condition without delay ΔTd. The MOSFET drain generates and applies a detection signal (S) to a delaying circuit (D). The delaying circuit (D) is responsive to the transient detection signal (S) to asynchronously output two latch signals (S1) and (S2) which on application to respective latch circuits (L1, L2) cause a change in conduction state of PMOS (8) and NMOS (9). This arrangement reduces voltage undershoot.
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