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78S05 Fiches technique(PDF) 18 Page - STMicroelectronics

No de pièce 78S05
Description  2A POSITIVE VOLTAGE REGULATORS
PDF  21 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

78S05 Fiches technique(HTML) 18 Page - STMicroelectronics

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Figure 32 : Light Controllers (Vo min =Vxx +VBE).
VO falls when the light goes up
VO rises when the light goes up
Figure 33 : Protection against Input Short-circuit
with High Capacitance Loads.
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.
L78S00 SERIES
18/21



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