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L7805 数据表(PDF) 36 Page - STMicroelectronics |
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L7805 数据表(HTML) 36 Page - STMicroelectronics |
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36 / 57 page  Application information L78xx, L78xxC, L78xxAB, L78xxAC 36/57 DocID2143 Rev 31 Note: Application with high capacitance loads and an output voltage greater than 6 volts need an external diode (see Figure 23 on page 34) to protect the device against input short circuit. In this case the input voltage falls rapidly while the output voltage decrease slowly. The capacitance discharges by means of the base-emitter junction of the series pass transistor in the regulator. If the energy is sufficiently high, the transistor may be destroyed. The external diode by-passes the current from the IC to ground. Figure 28. Protection against input short-circuit with high capacitance loads |
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