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UA78L08CDRG4 Scheda tecnica(PDF) 10 Page - Texas Instruments |
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UA78L08CDRG4 Scheda tecnica(HTML) 10 Page - Texas Instruments |
10 / 28 page 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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