TLE4276 datasheet(2/16 Pages) SIEMENS

2 / 16 page

TLE 4276

Semiconductor Group

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

Qrated = 5.0 V (V50), 8.5 V (V85), 10 V (V10) and adjustable

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

I is necessary for compensating line influences. Using a resistor of

approx. 1

Ω in series with C

I, the oscillating of input inductivity and input capacitance can

be damped. The output capacitor

Q is necessary for the stability of the regulation circuit.

Stability is guaranteed at values

Q ≥ 22 µF and an ESR of ≤ 3 Ω within the operating

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

TLE4276 Datasheet(PDF) 2 Page - Siemens Semiconductor Group