R1211 Driving White LED Circuit

Published:2011/6/23 11:01:00 Author:Michel | Keyword: Driving, White, LED Circuit | From:SeekIC

Ricoh company manufacturing R1211 series products uses the CMOS technology, is a the low power switch type boost converter of current control function.Peripheral circuit is simple and it just need a inductance, a diode, a field effect tube, and several resistance and capacitance.Its input voltage range is 2.5～5.5V which is applied to single quarter lithium ion battery or ordinary dry battery power supply occasion.The chip inside uses PWM way and it produces as much as 15 V output voltage which can drive three series LED. R1211 series chip adopts phase compensation circuit application feedback loop which makes the boost conversion process response faster and the output voltage become more stable.The biggest R1211 duly ratio is 90%.Chip insdie builds soft start function and delay time is about 10 ms.



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