Q67000-A8187 Просмотр технического описания (PDF) - Infineon Technologies

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Q67000-A8187

5-V Low-Drop Voltage Regulator

Infineon Technologies 

TLE 4260

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 output voltage goes

below 96% of its typical value, an external capacitor is discharged on pin 4 by the reset

generator. If the voltage on the capacitor reaches the lower threshold VST, a reset signal

is issued on pin 2 and not cancelled again until the upper threshold VDT is exceeded. For

an output current of less than IQN Off = 10 mA the standby changeover turns off the reset

generator. The latter is turned on again when the output current increases, the output

voltage drops below 4.2 V or the delay capacitor is discharged by external measures.

The IC also incorporates a number of internal circuits for protection against:

• Overload

• Overvoltage

• Overtemperature

• Reverse polarity

Overvoltage

Monitoring

Input 1

Adjustment

Temperature

Sensor

Saturation

Control and

Protection

Circuit

BANDGAP

Reference

Control

Amplifier

+

-

Buffer

STANDBY

Changeover

7 Output

RESET

Generator

4 RESET

Delay

2 RESET

3

GND

Block Diagram

Semiconductor Group

3

AEB00578

1998-11-01

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