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參數資料
| 型號： | UPC29S78 |
| 英文描述： | Useage of Three-Terminal Regulators | User＇s Manual[05/2000] |
| 中文描述： | 使用三端穩(wěn)壓器|用戶手冊[05/2000] |
| 文件頁數： | 6/35頁 |
| 文件大小： | 187K |
| 代理商： | UPC29S78 |
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User’s Manual G12702EJ8V0UM00
14
Figure 4-2 is an example of a typical connection for obtaining a positive and negative power supply. The diodes
between output and GND are for preventing latchdown at startup and are absolutely necessary in the case of loads
shown by solid lines. Without the diodes, current flows in the separation regions between elements as described in
chapter 2 and the output voltage does not rise (refer to Figure 4-3).
Figure 4-2. Example of Typical Circuit Connection (Dual Power Supply Output)
VOUT
+VOUT
Di2
Positive voltage
3-terminal
regulator
Negative voltage
3-terminal
regulator
CIN
Di1
Load
Load A
Load B
Di1'
Co
Co'
CIN'
+VIN
GND
VIN
Di2'
CIN, CO, CIN', CO': As in the sample circuit for a single power supply load, these sometimes are needed depending
on circuit conditions.
Di1, Di1': Absolutely necessary for loads shown by solid lines, in which a load current flows from
+VOUT toward -VOUT.
This is to prevent regulator output on either side from being latched down by differences
occurring in the rise of regulator output voltage due to smoothing circuit capacitor capacity
differences or the like.
Note that these are not specifically needed in the case of only those loads shown by dashed
lines.
Di2, Di2': As in the sample circuit for a single power supply load, these sometimes are needed
depending on the application circuit.
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