TLE 4262

Semiconductor Group

4

1998-11-01

Circuit Description

The control amplifier compares a reference voltage, which is kept highly accurate by

resistance adjustment, to a voltage that is proportional to the output voltage and drives

the base of the series transistor via a buffer. Saturation control as a function of the load

current prevents any over-saturation of the power element. If the externally scaled down

output voltage at the reset threshold input drops below 1.35 V, the external reset delay

capacitor is discharged by the reset generator. If the voltage on the capacitor reaches

the lower threshold

V

again until the upper threshold

V

to GND, reset is triggered at an output voltage of 4.5 V. The IC can be switched at the

TTL-compatible, low-active inhibit input. It also incorporates a number of internal circuits

for protection against:

q

Overload

q

Overtemperature

q

Reverse polarity

Block Diagram