Data sheet

14

Rev. 1.0, 2009-05-18

TLE8366

Application Information

8

Application Information

Note: The following information is given as a hint for the implementation of the device only and shall not be

regarded as a description or warranty of a certain functionality, condition or quality of the device.

8.1

Frequency Compensation

The stability of the output voltage can be achieved with a simple RC connected between pin COMP and GND. The

standard configuration using the swiching frequency of the internal oscillator is a ceramic capacitor

C

and

R

application needs, such as varying switching frequency (using the sychronizing function), different types of buck

capacitor (ceramic or tantalum) etc.

The compensation network is essential for control loop stability. Leaving pin COMP open might lead to instable

operation.

8.2

Compensating a tantalum buck capacitor

The control loop is optimized for use of ceramic buck capacitors

C

capacitors with ESR up to 300m

required. It’s value calculates:

C

whereas

C

Figure 5

High-ESR buck capacitor compensation

8.3

Catch Diode

In order to minimize losses and for fast recovery, a schottky catch diode is required. Disconnecting the catch diode

during operation might lead to destruction of the IC.

2

GND

3

COMP

TLE8366

Application _C-COMP2.vsd