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UA7808CKTTR Fiches technique(PDF) 9 Page - Texas Instruments |
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UA7808CKTTR Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 23 page ![]() µA78xx +VO +VI −VO 1N4001 or Equivalent 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 VO(Reg) R1 Input IO IO = (VO/R1) + IO Bias Current 0.33 µF µA78xx Output μA7800 SERIES www.ti.com SLVS056O – MAY 1976 – REVISED AUGUST 2012 Figure 5. Current Regulator Figure 6. 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 7. This protects the regulator from output polarity reversals during startup and short-circuit operation. Figure 7. 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 8. Copyright © 1976–2012, Texas Instruments Incorporated Submit Documentation Feedback 9 |
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