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參數(shù)資料
| 型號： | R1201N051A-TR-FE |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | HALOGEN FREE AND ROHS COMPLIANT, SOT-23, 6 PIN |
| 文件頁數(shù)： | 15/17頁 |
| 文件大?。?/td> | 352K |
| 代理商： | R1201N051A-TR-FE |
R1201x
7
TYPICAL APPLICATIONS
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
1.0
μF
R1
10
Ω
VOUT
VFB
R1201x02xA/ 03xA/ 04xA
R1201x05xA
(External Components) C2: R1201x02xA/ 03xA/ 04xA
0.22
μF
C2: R1201x05xA
1.0
μF
LED Current setting
When CE pin input is "H" (Duty
=100%), LED current can be set with feedback resistor (R1)
ILED
=VFB / R1
LED Dimming Control
The LED brightness can be controlled by inputting the PWM signal to the CE pin. If the CE pin input is "L" in
the fixed time (Typ.0.5ms), the IC becomes the standby mode and turns OFF LEDs.
The current of LEDs when the CE pin is "H" input (Duty
=100%) is shown by the above expression. The current
of LEDs can be controlled by Duty of the PWM signal of the input CE pin. The current of LEDs when High-Duty
of the CE input is Hduty reaches the value as calculatable following formula.
ILED
=Hduty × VFB / R1
The frequency of the PWM signal is using the range between 200Hz to 300kHz.
When controlling the LED brightness by the PWM signal of 20kHz or less; The increasing or decreasing of the
inductor current might be make a sounds in the hearable sound wave area. In that case, please use the PWM
CE
VFB
R1
Hduty
Dimming control by CE pin input
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