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参数资料
| 型号： | R5220D191A-TR |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 0.8 A SWITCHING REGULATOR, 1440 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 0.85 MM HEIGHT, TSON-6 |
| 文件页数： | 19/22页 |
| 文件大小： | 627K |
| 代理商： | R5220D191A-TR |
R5220D
6
TYPICAL APPLICATION
COUT 10
F
Lx
1
2
GND
3
4
5
MODE
CE
VIN
VIN
CIN 10
F
L 4.7
H
Load
VOUT
6
Parts Recommendation
CIN
10
F C2012JB0J106K(TDK)
COUT
10
F C2012JB0J106K(TDK)
L
4.7
H VLP5610-4R7(TDK)
External Components
Set external components such as an inductor, CIN, COUT as close as possible to the IC, in particular,
minimize the wiring to VIN pin and GND pin. If VDD line or GND line’s impedance is high, the internal voltage
level of the IC may fluctuate and the operation may be unstable. Make GND line and VDD line sufficient.
Through the VDD line, the GND line, the inductor, Lx pin, and VOUT line, a large current caused by switching
may flow, therefore, those lines should be sufficient and avoid the cross talk with other sensitive lines. Use
the individual line from the VOUT pin of the IC for the inductor and the capacitor and load.
Use a low ESR ceramic capacitor COUT/CIN with a capacity of 10F or more.
Select an inductor with an inductance range from 4.7H to 10H. The internal phase compensation is
secured with these inductance values and COUT value. Choose the inductor with a low DC resistance and
enough permissible current and hard to reach magnetic saturation. In terms of inductance value, choose the
appropriate value with considering the conditions of the input voltage range and the output voltage, and
load current. If the inductance value is too small and the load current is large, the peak current of Lx may
reach the Lx current limit, and the protection against over-current may work.
The protection circuit against over-current is affected by the self-heating and the heat radiation environment.
Therefore evaluate under the considerable environment of the application.
The performance of power source circuits using these 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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| R5220D191B | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:PWM Step-down DC/DC Converter with switch function |
| R5220D201A | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:PWM Step-down DC/DC Converter with switch function |
| R5220D201B | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:PWM Step-down DC/DC Converter with switch function |
| R5220D211A | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:PWM Step-down DC/DC Converter with switch function |
| R5220D211B | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:PWM Step-down DC/DC Converter with switch function |
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