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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)： | 11/35頁 |
| 文件大小： | 187K |
| 代理商： | UPC29S78 |
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User’s Manual G12702EJ8V0UM00
19
7. Remote shutdown circuit
VIN
Q1
VOUT
C1
0.1 F
IN
OUT
GND
R1
C2
0.1 F
D1
R2
Q2
R3
Control
Control the output voltage using a preregulator set up
ahead of the three-terminal regulator.
The control input is as follows.
At "H" level: Normal output
At "L" level: Output interruption
In addition, D1 is added to prevent reverse bias between
the input and output pins of the three-terminal regulator.
8. Slow startup circuit (without short circuit protection)
VIN
VOUT
C1
0.1 F
IN
OUT
GND
R2
D1
R3
C2
Q1
R1
IBIAS
VOUT
VO(REG)
VO final value
Delay time T
Power on
Time
This circuit moderates the rise time of the output
voltage.
At power-on, this is the three-terminal regulator's
specific output voltage, after which it gradually rises to
its final value.
The initial output voltage is
VO1 = VO(REG) .........…………………………......... (4.8)
The output voltage after stabilization is
Furthermore, the delay can be represented as follows if
expecting up to 99% of the final value.
T =
CR ln 0.01 [s] ........………………………....
(4.10)
9. Adjustable output voltage circuit
(without load short circuit protection)
VIN
VOUT
C1
IN
OUT
GND
C2
0.1 F
R2
D1
R1
IBIAS
0.1 F
Note that applications using the adjustable output three-terminal
regulator
PC317 are superior in output voltage precision and
stability.
The Zener diode in the circuit shown in 5 is replaced by
a resistor.
Use a voltage difference between input and output that
is within the three-terminal regulator ratings.
For a load short circuit or capacity load, the diode
shown using dashed lines is needed and in particular a
low forward voltage is needed.
VO(REG)
VO2 = VO(REG) + R1
IBIAS +
R2
…………. (4.9)
VO(REG)
VOUT = VO(REG) + R1
IBIAS +
R2
………… (4.11)
. .
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