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UA7805CKTTR Datasheet(PDF) 8 Page - Texas Instruments |
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UA7805CKTTR Datasheet(HTML) 8 Page - Texas Instruments |
8 / 19 page www.ti.com 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 Submit Documentation Feedback |
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