Patent ID: 7554823
Filing Date: 2009-06-30
Classification: H02M,H05B,Y02B

Abstract:
1. A controller IC for controlling a semiconductor switch for driving a load, the controller comprising: an oscillator block for generating a first triangular wave signal and a second triangular wave signal, said second triangular wave signal being reversed relative to the first triangular wave signal; a current detection signal input terminal to which a current detection signal is inputted, said current detection signal being based on a current flowing through the load; a PWM control signal generation circuit for generating a PWM control signal for switching the semiconductor switch based on the first triangular wave signal, the second triangular wave signal, and an error signal, said error signal being generated based on the current detection signal; a burst signal generation circuit for generating a burst signal in which a first state and a second state are repeated; and a burst control circuit coupled to the burst signal generation circuit inside the controller IC, wherein the burst control circuit halts a switching operation of the semiconductor switch when the burst signal is in the first state.