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UA7805CKTER bảng dữ liệu(PDF) 8 Page - Texas Instruments

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µA7815C
0.1
µF
1N4001
0.1
µF
1N4001
0.33
µF
2
µF
1N4001
1N4001
VO = 15 V
VO = −15 V
20-V Input
−20-V Input
µA7915C
1
µF
Operation With a Load Common to a Voltage of Opposite Polarity
µA78xx
+VO
+VI
−VO
1N4001
or
Equivalent
Reverse-Bias Protection
µA78xx
+VO
VI
µA7800 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS056L – MAY 1976 – REVISED NOVEMBER 2006
APPLICATION INFORMATION (continued)
Figure 5. Regulated Dual Supply
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.
Figure 6. Output Polarity-Reversal-Protection Circuit
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.
Figure 7. Reverse-Bias-Protection Circuit
8
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