TLE 4276

Semiconductor Group

2

1998-11-01

Functional Description

The TLE 4276 is a low-drop voltage regulator in a TO220 package. The IC regulates an

input voltage up to 40 V to

V

voltage (V). The maximum output current is 400 mA. The IC can be switched off via the

inhibit input, which causes the current consumption to drop below 10

µA. The IC is short-

circuit-proof and incorporates temperature protection that disables it at over-tempera-

ture.

Dimensioning Information on External Components

The input capacitor

C

approx. 1

be damped. The output capacitor

C

Stability is guaranteed at values

C

temperature range.

Circuit Description

The control amplifier compares a reference voltage 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 oversaturation of the power element. The

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

• Overload

• Overtemperature

• Reverse polarity