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参数资料
| 型号： | R1152N087-TR-FE |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO5 |
| 封装： | HALOGEN FREE AND ROHS COMPLIANT, SOT-23, 5 PIN |
| 文件页数： | 8/19页 |
| 文件大小： | 368K |
| 代理商： | R1152N087-TR-FE |
R1152N
16
APPENDIX
Technical Notes on Output Voltage Setting
EXT
VOUT
GND
I2
I3
R2
R3
2.5V
VOUT2
OUT
PNP Tr
IIC
RIC
The output voltage of regulator with R1152N025x may be adjustable for any output voltage between its 2.5V
reference and VDD setting level. An external pair of resistors is required, as shown above figure.
The complete equation for the output voltage is described step by step as follows;
I2
=IIC+I3.......................................................................................................................................(1)
I3
=2.5/R3 ...................................................................................................................................(2)
Thus,
I2
= IIC+2.5/R3 ..............................................................................................................................(3)
Therefore,
VOUT
=2.5+R2×I2.........................................................................................................................(4)
Put Equation (3) into Equation (4), then
VOUT
=2.5+R2×(IIC+2.5/R3)
=2.5×(1+R2/R3)+R2×IIC .....................................................................................................(5)
In 2nd term, or R2×IIC will produce an error in VOUT.
In Equation(5),
IIC
=2.5/RIC ..................................................................................................................................(6)
R2×IIC
=R2×2.5/RIC
=2.5×R2/RIC.................................................................................................................. (7)
For better accuracy, choosing R2 (<<RIC) reduces this error.
RIC is approximately 1.1MΩ.
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