4274V85 View Datasheet(PDF) - Infineon Technologies

Part Name

Description

Manufacturer

4274V85

TLE4274 / Low Drop Voltage Regulator

Infineon Technologies 

TLE 4274

Dimensioning Information on External Components

The input capacitor CI is necessary for compensating line influences. Using a resistor of

approx. 1 Ω in series with CI, the oscillating of input inductivity and input capacitance can

be damped. The output capacitor CQ is necessary for the stability of the regulation circuit.

Stability is guaranteed at values CQ ≥ 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 includes a number of internal circuits for protection against:

• Overload

• Overtemperature

• Reverse polarity

Data Sheet

2

Rev. 1.6, 2007-01-23

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