TLE 4265

Semiconductor Group

3

1998-11-01

Circuit Description

The control amplifier compares a highly precise reference voltage, produced by resistor

alignment, to a voltage that is proportional to the output voltage and drives the base of

the series transistor via a buffer. A saturation control, a function of the load current,

prevents any over-saturating of the power element. If the output voltage drops below

4.5 V, the external reset-delay capacitor is discharged by the reset generator. If the

voltage on the capacitor reaches the lower threshold

V

reset output and not canceled again until the upper threshold

V

protected against overload, overtemperature and reverse polarity.

Saturation

Control and

Protection

Adjustment

Reset

Generator

Buffer

+

-

Control

Amplifier

Temperature

Sensor

Bandgap

Reference

1

5

4

2

Output

Reset

Delay

Reset

Output

In-

put

GND

3

AEB01493