Minimum synchronization frequency discriminator

Details Minimum synchronization frequency discriminator Minimum synchronization frequency discriminator

2007-12-11

2007-12-11

Lee, Benny (Department: 2817)

Oscillators

Plural oscillators

Selectively connected to common output or oscillator...

C331S055000, C331S111000, C331S145000, C331S172000, C323S282000

Reexamination Certificate

active

11242238

ABSTRACT:
A minimum frequency synchronization discriminator for use in providing a clock signal for a switch mode power supply automatically detects when the frequency of a sync signal is above a minimum frequency and causes the sync signal to serve as the clock signal for the controller. If the frequency of the sync signal is below the minimum frequency, the minimum synchronization frequency discriminator causes the output signal of the internal oscillator to serve as the clock signal.

REFERENCES:
patent: 4816776 (1989-03-01), Kessler
patent: 5101127 (1992-03-01), Simpson
patent: 6850101 (2005-02-01), De Stasi
patent: 6970045 (2005-11-01), Lichter et al.
patent: 2004/0190331 (2004-09-01), Ross et al.

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