R1212 Driving White LED Application Circuit

Published:2011/7/11 23:48:00 Author:Michel | Keyword: White LED, Application Circuit | From:SeekIC

Ricoh R1211 uses CM0S low power consumption and current control switch type boost converter. Its periphery circuit is simple and there is just an inductor, a diode, a mosfet,some resistance and capacitance.The input voltage range is 2.5 ~ 5.5 V and it is suitable for single quarter lithium ion battery or ordinary dry battery power supply. The chip inside uses PWM,which can produce as much as 15 V output voltage and it drives three series white LED. R1211 series chip adopts the phase compensation feedback loop,which makes whole boost conversion process response more rapidly and output voltage becomes more stable.



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