L7806 STMICROELECTRONICS [STMicroelectronics], L7806 Datasheet - Page 23

• Manufacturer Part Number: L7806
• Description: POSITIVE VOLTAGE REGULATORS
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Figure 35: Adjustable Output Voltage with Temperature Compensation
NOTE: Q
Figure 36: Light Controllers (V
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.
2
is connected as a diode in order to compensate the variation of the Q
V
O
V
falls when the light goes up
O
= V
XX
(1+
R
R
2
1
+ V
Omin
BE
= V
XX
+ V
BE
)
1
V
BE
with the temperature. C allows a slow rise time of the V
V
O
rises when the light goes up
L7800 SERIES
23/34
O
.