Constant-peak-current minimum-off-time pulse frequency...

Details Constant-peak-current minimum-off-time pulse frequency... Constant-peak-current minimum-off-time pulse frequency...

2006-10-03

2006-10-03

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S285000

Reexamination Certificate

active

07116089

ABSTRACT:
Methods and apparatus are disclosed for controlling switching regulators to automatically switch from a traditional pulse-width modulation (PWM) mode, when the load current is higher than a predetermined value, to a pulse-frequency modulation (PFM) mode, when the load current drops to a point lower than the predetermine value. Switching modes increases the efficiency of the regulator when the load current is low without provoking a large output voltage transient. In some embodiments, a single switching cycle regulates the output in the PFM mode, which reduces the switching losses and enhances the efficiency of the regulator.

REFERENCES:
patent: 7030596 (2006-04-01), Salerno et al.
patent: 7061213 (2006-06-01), Yoshida

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