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UA78L08AILP Datasheet(PDF) 10 Page - Texas Instruments

Part # UA78L08AILP
Description  POSITIVE-VOLTAGE REGULATORS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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UA78L08AILP Datasheet(HTML) 10 Page - Texas Instruments

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µA78L00 SERIES
POSITIVE-VOLTAGE REGULATORS
SLVS010S − JANUARY 1976 − REVISED FEBRUARY 2004
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
µA78L15
0.1
µF
1N4001
0.1
µF
1N4001
0.33
µF
0.33
µF
1N4001
1N4001
VO = 15 V
VO = −15 V
20-V Input
−20-V Input
µA79L15
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.
µA78Lxx
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 employed as shown in Figure 7.
µA78Lxx
VO
VI
Figure 7. Reverse-Bias-Protection Circuit


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