Soft start pulse width modulation integrated circuit

Details Soft start pulse width modulation integrated circuit Soft start pulse width modulation integrated circuit

1996-12-23

1999-09-07

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

323283, H02M 112

Patent

active

059496657

ABSTRACT:
A soft start pulse width modulation integrated circuit having a reduced number of external connection terminals, a single one of which transmits the soft start signal superimposed upon an external sync signal. The soft start pulse width modulation integrated circuit includes a comparison voltage signal generating circuit, a soft start and external sync generation circuit, a comparator, a triangle signal generator and a pulse width modulator. The voltage level of a comparison voltage signal is increased over time in response to a feedback signal. A DC voltage signal is generated having a voltage level which increases over time but at a lesser rate than the comparison voltage signal and is superimposed with an external sync signal. The superimposed signal is compared with a reference signal and the resulting compared signal determines a triangular signal generated therefrom which has one of two different oscillation modes: a variable natural mode, and a regulated synchronized mode. The pulse width modulator receives the triangular signals and outputs a pulse-width modulated signal from a single external connection which is dependent upon the oscillation output received from the triangular signal generator.

REFERENCES:
patent: 3693340 (1972-09-01), Kanai et al.
patent: 4625271 (1986-11-01), Chetty et al.
patent: 5179331 (1993-01-01), Sloot
patent: 5537305 (1996-07-01), Colotti
patent: 5656890 (1997-08-01), Park
patent: 5675485 (1997-10-01), Seong

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