L78S09 Просмотр технического описания (PDF) - STMicroelectronics

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L78S09

2A POSITIVE VOLTAGE REGULATORS

STMicroelectronics 

L78S00 SERIES

Figure 32 : Light Controllers (Vo min = Vxx + VBE).

VO falls when the light goes up

Figure 33 : Protection against Input Short-circuit

with High Capacitance Loads.

VO rises when the light goes up

Applications 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 decreases showly.

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 tran-

sistor may be destroyed. The external diode by-

passes the current from the IC to ground.

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