Patent ID: 7408307
Filing Date: 2008-08-05
Classification: H05B,Y02B,Y10S

Abstract:
1. A circuit for driving a switching half bridge to supply power to a load, the circuit comprising: a half bridge driver for supplying control signals to the half bridge; a switching control circuit comprising a voltage controlled oscillator (VCO) having an internally set minimum frequency and coupled to the half bridge driver for controlling the half bridge driver to supply signals to the half bridge; and a dimming circuit coupled to the VCO for receiving a dimming control voltage, and in response, controlling an input voltage to said VCO and thereby influencing an output power of said half bridge; wherein said circuit is comprised in an integrated circuit, and said dimming control voltage is applied to a dimming pin of said integrated circuit: and wherein said integrated circuit has only eight pins including said dimming pin.