L7809CV(2014) 查看數據表（PDF） - STMicroelectronics

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L7809CV
(Rev.:2014)

Positive voltage regulator ICs

STMicroelectronics 

Application information

Positive voltage regulator ICs

Figure 27. Protection against input short-circuit with high capacitance loads

Note:

Application with high capacitance loads and an output voltage greater than 6 volts need an

external diode (see Figure 22 on page 31) 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.

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