R1218x

6

TYPICAL APPLICATIONS

R1218x041A

R1218x062A

C1

CE

GND

1

µF

L1

22

µH

C2

0.22

µF

R1

10

Ω

C1

CE

GND

1

µF

L1

22

µH

C2

0.22

µF

R1

10

Ω

LED current can be set with feedback resister(R1)

=0.2 / R1

(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

R1

Dimming controle by CE pin input