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L7805CV Datasheet(PDF) 23 Page - STMicroelectronics

Part No. L7805CV
Description  POSITIVE VOLTAGE REGULATORS
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7805CV Datasheet(HTML) 23 Page - STMicroelectronics

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L7800 SERIES
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Figure 35: Adjustable Output Voltage with Temperature Compensation
NOTE: Q2 is connected as a diode in order to compensate the variation of the Q1 VBE with the temperature. C allows a slow rise time of the VO.
Figure 36: Light Controllers (VOmin = VXX + VBE)
Figure 37: Protection against Input Short-Circuit with High Capacitance Loads
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.
R2
VO = VXX (1+ ) + VBE
R1
VO rises when the light goes up
VO falls when the light goes up


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