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TL780 데이터시트(PDF) 7 Page - Texas Instruments |
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TL780 데이터시트(HTML) 7 Page - Texas Instruments |
7 / 8 page TL780 SERIES POSITIVE-VOLTAGE REGULATORS SLVS055F – APRIL 1981 – REVISED DECEMBER 1999 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION Figure 2. Positive Regulator in Negative Configuration (VI Must Float) –VO GND VI – + COMMON In Out TL780-xx IL Figure 3. Current Regulator IO OUTPUT R1 0.33 µF C1 INPUT TL780-xx VO(Reg) IO = (VO/R1) + IO Bias Current 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 4. This protects the regulator from output polarity reversals during startup and short-circuit operation. VI Equivalent or 1N4001 –VO VO TL780-xx Figure 4. Output Polarity-Reversal-Protection Circuit reverse-bias protection 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. VO VI TL780-xx Figure 5. Reverse-Bias-Protection Circuit |
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