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RH5RH303B-T1 参数 Datasheet PDF下载

RH5RH303B-T1图片预览
型号: RH5RH303B-T1
PDF下载: 下载PDF文件 查看货源
内容描述: PWM升压型DC / DC转换器 [PWM STEP-UP DC/DC CONVERTER]
分类和应用: 转换器
文件页数/大小: 29 页 / 198 K
品牌: RICOH [ RICOH ELECTRONICS DEVICES DIVISION ]
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RH5RH  
BLOCK DIAGRAM  
VLX limiter  
Buffer  
Slow start  
Vref  
Lx  
OUT  
Phase Comp.  
Vss  
LxSW  
PWM control  
+
EXT  
OSC  
Error Amp.  
Chip Enable  
CE  
Error Amp. (Error Amplifier) has a DC gain of 80dB, and Phase Comp. (Phase Compensation Circuit)  
provides the frequency characteristics including the 1st pole (fp=0.25Hz) and the zero point (fz=2.5kHz).  
Furthermore, another zero point (fz=1.0kHz) is also obtained by the resistors and a capacitor connected to  
the OUT pin.  
............  
(Note) Lx Pin  
only for RH5RH××1A and RH5RH××3B  
only for RH5RH××2B and RH5RH××3B  
only for RH5RH××3B  
.........  
EXT Pin  
...........  
CE Pin  
SELECTION GUIDE  
In RH5RH Series, the output voltage, the driver, and the taping type for the ICs can be selected at the user's  
request. The selection can be made by designating the part number as shown below :  
RH5RH×××× ×× Part Number  
a b  
c
Code  
Description  
Setting Output Voltage (VOUT):  
Stepwise setting with a step of 0.1V in the range of 2.7V to 7.5V is possible.  
a
Designation of Driver:  
1A: Internal Lx Tr. Driver (Oscillator Frequency 50kHz)  
2B: External Tr. Driver (Oscillator Frequency 100kHz)  
3B: Internal Tr./External Tr. (selectively available) (Oscillator Frequency 100kHz, with chip  
enable function)  
b
c
Designation of Taping Type :  
:
Ex. SOT-89  
T1, T2  
:
SOT-89-5 T1, T2  
(refer to Taping Specifications)  
“T1” is prescribed as a standard.  
For example, the product with Output Voltage 5.0V, the External Driver (the Oscillator Frequency 100kHz)  
and Taping Type T1, is designated by Part Number RH5RH502B-T1.  
2