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| 型號(hào)： | uA7800KC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 16-Wide LVDS Receiver |
| 中文描述： | 正電壓調(diào)節(jié)器 |
| 文件頁(yè)數(shù)： | 8/14頁(yè) |
| 文件大?。?/td> | 364K |
| 代理商： | UA7800KC |
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μ
A7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056J
–
MAY 1976
–
REVISED MAY 2003
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
μ
A7815C
0.1
μ
F
1N4001
0.1
μ
F
1N4001
0.33
μ
F
2
μ
F
1N4001
1N4001
VO = 15 V
VO =
–
15 V
20-V Input
–
20-V Input
μ
A7915C
1
μ
F
Figure 5. Regulated Dual Supply
operation with a load common to a voltage of opposite polarity
In many cases, a regulator powers a load that is not connected to ground but, instead, is connected to a voltage
source of opposite polarity (e.g., operational amplifiers, level-shifting circuits, etc.). In these cases, a clamp
diode should be connected to the regulator output as shown in Figure 6. This protects the regulator from output
polarity reversals during startup and short-circuit operation.
μ
A78xx
+VO
+VI
–
VO
1N4001
or
Equivalent
Figure 6. Output Polarity-Reversal-Protection Circuit
reverse-bias protection
Occasionally, the input voltage to the regulator can collapse faster than the output voltage. This can occur, for
example, when the input supply is crowbarred during an output overvoltage condition. If the output voltage is
greater than approximately 7 V, the emitter-base junction of the series-pass element (internal or external) could
break down and be damaged. To prevent this, a diode shunt can be used as shown in Figure 7.
μ
A78xx
+VO
VI
Figure 7. Reverse-Bias-Protection Circuit
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