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參數資料
| 型號： | RP400K231C-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.8 A SWITCHING REGULATOR, 805 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 1.80 X 2 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6 |
| 文件頁數： | 16/16頁 |
| 文件大小： | 459K |
| 代理商： | RP400K231C-TR |
RP400xxx1C Series
9
●Setting of output voltage
Output voltage(1.8V to 5.0V recommended range of voltage) can be set with divider resistors for voltage
setting, R1 and R2 as shown in the typical application. Refer to the next formula.
Output Voltage＝ VFB×(R1+R2)/ R1
(VFB=0.6V)
Recommended value of resistors(R1+R2) is lower than 100k.
Make sufficient power supply and ground and reinforce supplying. The large switching current could flow
through the connection of power supply, inductor, ground, diode and the connection of VOUT. If the
impedance of the connection of power supply and ground is high, the voltage level of power supply of the IC
fluctuates with the switching current. We recommend you to use output capacitor and diode with an
allowable voltage at least 1.5 times as much as setting output voltage. This is because there may be case
where a spike-shaped high voltage is generated by an inductor when built-in transistor is on and off.
Use a diode of a Schottky type with high switching speed, low reverse current and also pay attention to its
current capacity.
Set external components as close as possible to the IC and minimize the connection between the
components and the IC. In particular, output capacitor should be connected to VOUT pin with IC ground by
the minimum connection, because this IC uses the VOUT voltage as the main power supply, after start-up.
Use capacitors with a capacity of 10
μF or more for VOUT pin. We recommend you to set a ceramic capacitor
(10
μF) between VIN and ground.
The divider resistors should be placed as close as possible to the IC ground pin. VFB line is recommended to
use short line as well to avoid the influence of noise.
Please select the inductor value 10
μH in the case of VOUT≧2.5V and 6.8μH in the case of VOUT<2.5V.
Choose an inductor that has sufficiently small D.C. resistance and large allowable current and is hard to
reach magnetic saturation. And if the value of inductance of an inductor is extremely small, the ILX may
exceed the absolute maximum rating at the maximum loading. Use an inductor with appropriate inductance.
(Refer to next Output Current of Step-up Circuit and External Components)
*
The performance of power circuit using those ICs extremely depends upon the peripheral circuits. Pay
attention in the selection of the peripheral circuits. In particular, design the peripheral circuits in a way that
the values such as voltage, current, and power of each component, PCB patterns and the IC do not exceed
their respected rated values. (such as the voltage, current , and power)
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