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| 型號： | SXP2870AU-5.0 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 4/7頁 |
| 文件大?。?/td> | 195K |
| 代理商： | SXP2870AU-5.0 |
Rev. 10/30/00
SPX2870
Basic Adjustable Regulator
Output Voltage
Consider Figure 2. The resistance R
1
generates a constant current flow, normally the specified load current of 10mA. This current will
go through the resistance R
2
to set the overall output voltage. The current I
ADJ
is very small and constant. Therefore its contribution to
the overall output voltage is very small and can generally be ignored
Load Regulation
Parasitic line resistance can degrade load regulation. In order not to affect the behavior of the regulator, it is best to connect directly
the R
1
resistance from the resistor divider to the case, and not to the load. For the same reason, it is best to connect the resistor R
2
to
the Negative side of the load.
R
P
Parasitic Line
Resistance
SPX2870
Fig.2 Basic Adjustable Regulator
V
OUT
V
IN
V
REF
R
1
R
2
I
ADJ
50μA
V
OUT
= V
REF
(1 + R
2
) + I
ADJ
R
2
R
1
*
*
SPX2870
Fig.3 Basic Adjustable Regulator
V
IN
R
2
R
1
Connect R
2
to Load
R
L
Connect R
to
Case of Regulator
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