L7818CD2T 查看數據表（PDF） - STMicroelectronics

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产品描述 (功能)

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L7818CD2T

POSITIVE VOLTAGE REGULATORS

STMicroelectronics 

Figure 33 : Protection against Input Short-Circuit with High Capacitance Loads

L7800 SERIES

Application with high capacitance loads and an output voltage greater than 6 volts need an external diode (see fig. 33) 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 de-

stroyed. The external diode by-passes the current from the IC to ground.

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