L78S09CT View Datasheet(PDF) - STMicroelectronics

Part Name

Description

View to exact match

L78S09CT

2 A positive voltage regulators

STMicroelectronics 

L78Sxx - L78SxxC

Typical performance

Figure 37. Protection against input short-circuit with high capacitance loads

1. Application with high capacitance loads and an output voltage greater than 6 volts need an external diode

(see Figure 30 on page 22) 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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