參數(shù)資料
型號(hào)： UPC3025
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)： 16/35頁
文件大?。?/td> 187K
代理商： UPC3025
User’s Manual G12702EJ8V0UM00
23
5.3 Applying Transient Voltage to Input Pins
A three-terminal regulator is destroyed if a higher voltage than the rating or a voltage more than 0.5 V lower than
the GND pin is applied to the input line. In cases in which such voltages are superimposed on the line, add a surge
suppressor using a Zener diode or the like.
Figure 5-2
(a)
(b)
IN
OUT
GND
+ VIN
+ VO
R
ZD
C
L
D1
C
IN
OUT
GND
5.4 Reverse Bias Between Output Pin and GND Pin
Figure 5-3
(a)
(b)
IN
OUT
GND
+ VIN
VOUT
ZD
IBIAS
VZ
External protection diode
In the sample application shown in Figure 5-3 (a), the voltage of the Zener diode is applied between the output
and GND pins of the three-terminal regulator when the load is short-circuited.
Inside the three-terminal regulator, a diode like that shown in Figure 5-3 (b) apparently is formed, but if a current
flows in this part, the three-terminal regulator is sometimes destroyed. Therefore, when using a GND like that shown
in Figure 5-3 (a) in a floating state, it is necessary to add a low forward voltage diode from the GND pin of the three-
terminal regulator toward the output pin.
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