Semiconductor device

Details Semiconductor device Semiconductor device

2007-01-23

2007-01-23

Mullins, Burton S. (Department: 2836)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

Reexamination Certificate

active

10895083

ABSTRACT:
The present invention relates to a semiconductor device that is employed in a switching power supply for which a higher output is required, prevents noise from the coil, transformer, and so forth and implements a high efficiency power supply. By connecting a current mirror circuit including a p-type MOSFET, an overcurrent detection level tuning circuit, an overcurrent detection circuit, and an intermittent oscillation control circuit to an FB terminal peripheral circuit that is a feedback signal input terminal, PWM control capable of varying the IDRAIN peak value is implemented for the transition from a heavy load state to a light load state and intermittent oscillation control is implemented for the transition between a light load state to a loadless state, such that noise from the coil, transformer, and the like is suppressed and higher efficiency is realized.

REFERENCES:
patent: 5481178 (1996-01-01), Wilcox et al.
patent: 6297623 (2001-10-01), Balakrishnan et al.

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