Fenwick & West LLP
Power converter controller IC having input voltage pin with multiple functions
A controller integrated circuit (IC) for controlling a power converter uses its input voltage pin with a plurality of functions, including receiving an input voltage to the power converter, charging an external startup capacitor through charging circuitry coupled internally to the input voltage pin, and also receiving a test signal for programming a programmable resistance in an input voltage scale down circuitry coupled to the input voltage pin. Use of the input voltage pin with a plurality of functions reduces the number of pins required in the controller IC, thereby reducing the cost of manufacturing the controller IC.
iWatt Inc.
H
H02M
inventional
Jiang Junjie Allan Ming-Lun
Chen Zheng Lin