Current mode pulse frequency modulation switching regulator

Details Current mode pulse frequency modulation switching regulator Current mode pulse frequency modulation switching regulator

2007-01-26

2010-06-01

Sterrett, Jeffrey L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S282000, C323S285000

Reexamination Certificate

active

07728567

ABSTRACT:
A method of providing current mode pulse frequency modulation (PFM) for a switching regulator can include resetting a driver input for a fixed duration when a first current in the driver reaches a first value set by an error amplifier output. The first current can be associated with PMOS switching transistors in the driver. The method can also include setting the driver input signal for the same fixed duration when a second current in the driver reaches a second value. This second current can be associated with NMOS switching transistors in the driver. In one embodiment, the driver can be tristated to ignore both the resetting and the setting. Using this method, perturbations of the inductor current can be substantially corrected and have limited impact on the current waveform beyond the cycle in which they occur.

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Lenk, John D. (1999). “Circuit Troubleshooting Handbook” p. 242. McGraw-Hill, New York.

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