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參數(shù)資料
| 型號： | R1218K042A-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, DSO6 |
| 封裝： | 1.80 X 2 MM, PLP-6 |
| 文件頁數(shù)： | 20/22頁 |
| 文件大?。?/td> | 669K |
| 代理商： | R1218K042A-TR |
R1218x
7
TYPICAL APPLICATIONS
R1218x041A
R1218x062A
C1
VIN
LX
CE
GND
1
F
L1
22
H
C2
0.22
F
R1
10
VOUT
VFB
C1
VIN
LX
CE
GND
1
F
L1
22
H
C2
0.22
F
R1
10
VOUT
VFB
LED Current setting
LED current can be set with feedback resistor(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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