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R1218N022A Datasheet(PDF) 6 Page - RICOH electronics devices division |
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R1218N022A Datasheet(HTML) 6 Page - RICOH electronics devices division |
6 / 21 page R1218x 6 TYPICAL APPLICATIONS R1218x041A R1218x062A C1 VIN LX CE GND 1 µF L1 22 µH C2 0.22 µF R1 10 Ω VOUT VFB C1 VIN LX CE GND 1 µF L1 22 µH C2 0.22 µF R1 10 Ω VOUT VFB • LED Current setting LED current can be set with feedback resister(R1) ILED =0.2 / R1 • LED Dimming Control, Softstart (1) LED dimming control by PWM signal to CE pin LED dimming control is possible by forcing PWM signal to CE pin. When the power-on or start up with CE pin, softstart function works, however, after that, if the CE pin is set as "L" and set CE pin "H" again during the shutdown delay time, softstart function is disabled and starts up fast to normal mode, therefore 200Hz to 5kHz PWM signal is standard. By the CE pin input, LED turns on and off. Average LED current varies depending on the duty cycle of CE input. Too high frequency PWM signal is not effective because of its delay. CE VFB R1 Dimming controle by CE pin input |
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