R1211 White LED driver circuit diagram

Published:2011/8/25 21:12:00 Author:Lucas | Keyword: White LED driver | From:SeekIC

Ricoh's R1211 Series use low-power CMOS technology to produce the switching boost converters with current controlling function. The peripheral circuit is simple, it just needs an inductor, a diode, a FET and a few resistors and capacitors. The input voltage range is 2.5 ~ 5.5V, and it is suitable for single cell lithium-ion battery or ordinary dry battery power supply. The internal parts of the chip uses PWM modulation, which can produce 15V output voltage to drive 3 series white LEDs. The maximum duty cycle of R1211 is 90%. R1212 has a 1.4MHz fixed switching frequency.



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