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(yè)數(shù)： 10/35頁(yè)
文件大?。?/td> 187K
代理商： UPC3025
User’s Manual G12702EJ8V0UM00
18
4. High input voltage circuit
VIN
Q1
IOUT
VOUT
C1
0.1 F
IN
OUT
GND
R1
ZD
C2
0.1 F
This circuit can be used when the input voltage exceeds
the rating.
Moreover, if the load current changes little, a resistor
can be used.
5. High input, high output voltage circuit
(without short circuit protection)
VIN
VOUT
C1
0.1 F
IN
OUT
GND
ZD
D
0.1
F
C2
R1
Using the fact that the current flowing out from the GND
pin of the three-terminal regulator is practically constant,
add Zener Di to the GND pin to raise only the Zener
portion of the voltage. R1 supplies idling to the Zener. It
also is possible to use a resistor, but this is inferior to
the Zener from a stability standpoint.
D is needed as load short circuit protection. In addition,
the input voltage must be set within a range that holds
the voltage difference between input and output to the
ratings even on a short circuit.
This circuit combines circuits 4 and 5. The circuit made
up of Q1, Q2, and D1 is a preregulator.
The output voltage is as follows.
VOUT = VO(REG) + VZD ..…………………………....... (4.7)
D2 protects against reverse bias in the GND and OUT
pins on a load short circuit.
6. High input, high output voltage circuit
(with short circuit protection
Note)
VIN
Q2
VOUT
C1
0.1 F
IN
OUT
GND
Q1
R1
4.7 k
R2
1 k
D1
ZD
C2
0.1
F
D2
Note
D1 or ZD must be selected so that the voltage
difference between input and output of the three-
terminal regulator is kept within ratings even on a
load short circuit.
In addition, D2 must have low forward voltage.
VIN
VZD
R1 =
IOUT(MAX.)
………………………………….… (4.6)
hFE1(MIN.)
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