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參數(shù)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(shù)： | 13/35頁 |
| 文件大?。?/td> | 187K |
| 代理商： | UPC29S78 |
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User’s Manual G12702EJ8V0UM00
20
10. Adjustable output voltage circuit
(0.5 to 10 V, without short circuit protection)
+VIN
VOUT
C1
PC7805A
IN
OUT
GND
R1
C2
RD6.2EB
10 F
+
0.1 F
R4
910
R5
9.1 k
VO(REG)
PC741
+
0.1 F
R2
10
k
VIN R3
10 F
+
Splits the fixed output voltage VO(REG) of the three-
terminal regulator using R4 and R5 and compares with
the output voltage VOUT value split using R1 and R2.
The output voltage can be represented as follows.
11. Adjustable output voltage circuit (7 to 30 V)
0.1 F
VIN
VOUT
C1
IN
OUT
GND
R1
C2
+
0.1 F
R2
10 k
PC741
This is similar to the circuits shown in 5 and 8. Since it
uses op amplifier
PC741 with a single power supply,
the lowest value of the output voltage can be no lower
than the sum of the output saturated voltage of the
PC741 and the output voltage of the three-terminal
regulator.
12. Tracking regulator circuit
0.1 F
+VIN
+VOUT
C1
IN
OUT
GND
R1
R2
VIN
VOUT
0.1 F
C3
0.1 F
C2
Tf1
PC741
D1
+
A tracking regulator is configured using a power
transistor with one positive voltage three-terminal
regulator.
The positive voltage is the fixed voltage of the three-
terminal regulator. The negative voltage can be
changed arbitrarily by the split ratio of R1 and R2.
Thus the negative voltage output is as follows.
D1 protects against reverse bias between the base and
emitter of the transistor at power-on.
R4
R1 + R2
VOUT =
R4 + R5
× VO(REG) ×
R1
…………. (4.12)
R2
VOUT =
R1
VOUT ……………………………. (4.13)
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