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參數資料
| 型號： | 7805CV |
| 廠商： | 意法半導體 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| 中文描述： | 5.0放大器正電壓穩壓器 |
| 文件頁數： | 20/23頁 |
| 文件大小： | 264K |
| 代理商： | 7805CV |
Figure30 :
Power AM Modulator(unityvoltage
gain, I
o
< 1A).
Figure 31 :
AdjustableOutput Voltage with
TemperatureCompensation.
NOTE:
The circuit performs wellup to 100KHz
NOTE:
Q
2
is connected as a diode in order to compensate the
variation of the Q
1
V
BE
with the temperature. C allows a slow rise-
time ofthe V
o
Figure32 :
Light Controllers (V
o min
= V
xx
+ V
BE
).
Figure33 :
Protectionagainst Input Short-circuit
with High CapacitanceLoads.
Application with high capacitance loads and an output voltage
greater than 6 volts need an external diode (see fig. 33) to protect
the deviceagainst input short circuit. In this case the input voltage
falls rapidly while the output voltage decrease slowly. The
capacitance dischrges by means of the Base-Emitter junction of
the series pass transistor in the regulator. If the energy is
sufficently high, the transistor may be destroyed. The external
diode by-passes the current from the IC toground.
V
O
falls when the light goes up
V
O
rises when the light goes up
V
O
= V
XX
(
1
+
R
2
R
1
) +
V
BE
L7800
20/25
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