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TL780-12CKC Datasheet(PDF) 6 Page - Texas Instruments |
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TL780-12CKC Datasheet(HTML) 6 Page - Texas Instruments |
6 / 16 page www.ti.com APPLICATION INFORMATION V O GND V I + COMMON INPUT OUTPUT TL780-xx I L I O OUTPUT R1 0.33 F µ C1 INPUT TL780-xx V (Reg) O I = (V /R1) + I Bias Current O O O Operation With a Load Common to a Voltage of Opposite Polarity V I Equivalent or 1N4001 –V O V O TL780-xx Reverse-Bias Protection V O V I TL780-xx TL780 SERIES POSITIVE-VOLTAGE REGULATORS SLVS055M – APRIL 1981 – REVISED OCTOBER 2006 Figure 2. Positive Regulator in Negative Configuration (VI Must Float) Figure 3. Current Regulator 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 4. This protects the regulator from output polarity reversals during startup and short-circuit operation. Figure 4. Output Polarity-Reversal-Protection Circuit Occasionally, the input voltage to the regulator can collapse faster than the output voltage. This, for example, could occur 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 5. Figure 5. Reverse-Bias-Protection Circuit 6 Submit Documentation Feedback |
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