Pulse width modulated controller applied to switch-type...

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control

Reexamination Certificate

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Details

C323S284000

Reexamination Certificate

active

08063684

ABSTRACT:
A PWM controller applied to switch-type voltage regulator includes an error amplifier, a soft-start control circuit, a compensating load and a comparator. The error amplifier receives a reference voltage signal and a feedback voltage signal and outputs an error current signal according to the received feedback voltage signal and the reference voltage signal. The soft-start control circuit outputs a compensating current signal according to at least one soft-start control signal. The compensating load receives the error current signal and the compensating current signal, and outputs a compensating signal. The comparator receives a ramp signal and the compensating signal, and outputs a pulse width modulated (PWM) signal. When a supply voltage rises, the error amplifier is compensated with a preset soft-start compensating current to a circuit common ground VSS, so that the error signal slowly rises during the soft-start control process. Therefore, the function of soft-starting is effectuated.

REFERENCES:
patent: 5313146 (1994-05-01), Koblitz
patent: 6483383 (2002-11-01), Wu
patent: 7002330 (2006-02-01), Kitani et al.

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