TLE 4284

Target Data Sheet Rev. 0.2

12

2000-10-06

In the fixed voltage TLE 4284 devices the output voltage is divided internally and

compared to an internal reference of 1.25 V typical. The regulation loop controls the

output voltage to achieve the output voltage of 5 V, 3.3 V or 2.5 V. The variable device

compares the voltage difference between the adjust pin ADJ and the output pin Q to the

internal reference of 1.25 V; the output voltage is adjusted by an external voltage divider

between Q, ADJ and GND (see equation in Figure 7).

Output

The output current limitation is reduced as a function of the input voltage for high input

voltages above 25 V.

The TLE 4284 requires no output capacitor for stability, however we recommend to use

a ceramic capacitor to filter any noise and improve the transient response.

At the input of the regulator a capacitor is necessary for compensation of line influences.

A resistor of approx. 1

the input capacitor. A serial diode should be used to eliminate negative voltages from the

input.

For the variable voltage type an additional decoupling a capacitor

C

can improve the ripple rejection ratios.