Datasheet

Data Sheet 2 Rev. 1.7, 2007-02-19
TLE 4275
Dimensioning Information on External Components
The input capacitor
C
I
is necessary for compensation of 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
C
Q
is necessary for the stability of the regulation
circuit. Stability is guaranteed at values
C
Q
≥ 22 µF and an ESR of ≤ 5 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