AN993

Description of the demonstration application

Doc ID 5656 Rev 10

15/27

4

Description of the demonstration application

The design has been developed to drive a TL fluorescent lamp up to 58 W. It is composed of

two sections: the PFC, using the L6561 controller, and the ballast, based on the L6574 (see

Figure 13 and Figure 14). The application is provided with a current feedback that can be

used to control the power (and, if necessary, the dimming function) by varying the switching

frequency during normal burning of the lamp. The application is also provided with a safety

circuitry that gets activated when an open load or faulty ignition of the lamp is detected.

Figure 13.

Demonstration application circuit

AM01321v1