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UA78L05AILP 데이터시트(PDF) 9 Page - Texas Instruments |
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UA78L05AILP 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 27 page µA78Lxx VO VI µA78Lxx VO VI -V O 1N4001 or Equivalent 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 μA78L00 www.ti.com SLVS010U – JANUARY 1976 – REVISED MAY 2011 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 (for example, operational amplifiers, level-shifting circuits, and so on). 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 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. Figure 7. Reverse-Bias-Protection Circuit Copyright © 1976–2011, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links :μA78L00 |
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