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參數(shù)資料
| 型號(hào)： | UPC16318 |
| 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(cè)[05/2000] |
| 文件頁數(shù)： | 7/35頁 |
| 文件大?。?/td> | 187K |
| 代理商： | UPC16318 |
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User’s Manual G12702EJ8V0UM00
15
If the output pin becomes a lower potential than GND, the P type separation region and n type output pin (NPN
transistor) enter a forward bias state and the "parasitic transistor" shown with dashed lines is formed. When this
occurs, it is connected to the adjacent transistors and does not operate normally.
Figure 4-3. Example of Power Supply IC Cross Section Diagram (Latchdown)
p
n
nn
Output
Separation
region
NPN transistor
p
n p
<2> Adjustable output voltage type
When a voltage not included in a fixed output voltage type is needed or the output voltage is to be adjusted
and used, even a fixed output voltage type can be used by floating the GND as described later, but voltage
precision and drift become a problem. An adjustable output voltage type is useful in such cases.
Figure 4-4 shows an example of the typical connection. Since a bias current for the operation of each block
inside the IC flows from INPUT to OUTPUT as described in section 3.2, be careful of the load current. By
selecting 240
as R1 as in the sample typical connection even when there is no load, no problems arise
since a current of
1.25 V / 240
= 5.2 mA
flows to OUTPUT.
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