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參數(shù)資料
| 型號(hào)： | R1202N723D-TR-FE |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.9 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | HALOGEN FREE AND ROHS COMPLIANT, TSOT-23, 6 PIN |
| 文件頁數(shù)： | 2/23頁 |
| 文件大?。?/td> | 572K |
| 代理商： | R1202N723D-TR-FE |
R1202x
10
The Method of Output Voltage Setting ( R1202xxxxA/B )
The output voltage (VOUT) can be calculated with divider resistors (R1 and R2) values as the following formula:
Output Voltage (VOUT) = VFB
× (R1 + R2) / R1
The total value of R1 and R2 should be equal or less than 300k
Ω. Make the VIN and GND line sufficient. The
large current flows through the VIN and GND line due to the switching. If this impedance (VIN and GND line) is
high, the internal voltage of the IC may shift by the switching current, and the operating may become unstable.
Moreover, when the built-in LX switch is turn OFF, the spike noise caused by the inductor may be generated. As
a result of this, recommendation voltage rating of capacitor (C2) value is equal 1.5 times larger or more than the
setting output voltage.
LED Current setting ( R1202xxxxD )
When CE pin input is "H" (Duty=100%), LED current can be set with feedback resistor (R1)
ILED = VFB / R1
LED Dimming Control ( R1202xxxxD )
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 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
signal in the high frequency area.
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