EVAL6574B STMicroelectronics

EVAL6574B CFL/TL ballast driver preheat and dimming demonstration board based on the L6574 Data brief Description This design was developed to drive a TL fluorescent lamp of up to 58 W. It is composed of EVAL6574B two sections: the PFC using the L6561 controller, and the ballast based on the L6574. The application includes a current feedback that can Features be used to control the power (and, if necessary, the dimming function) by varying the switching Dimmable fluorescent lamp ballast frequency during normal lamp operation. The Multiple T8 lamps application application also features safety circuitry which Wide range input (85 Vac 265 Vac) activates when an open load or faulty lamp PF > 0.99, THD < 10% ignition is detected. The PFC pre-regulator allows Fault ignition protection connection of the application to a wide input Lamp absence detection voltage range (85 Vac to 265 Vac) providing a Power Factor higher than 0.99 and a THD lower than 10%. May 2013 DocID024443 Rev 1 1/8 www.st.com Board description EVAL6574B 1 Board description Table 1: Board electrical specifications Parameter Value Input voltage 85 Vac to 265 Vac Power factor > 0.99 THD < 10% Output power Up to 58 W Lamp configuration Single lamp tubular T8 model (32 W to 58 W) Figure 1: Jumper and connector locations Table 2: Connector A pinout Name Type Function MAIN (AC IN) Screw connector Input voltage connection LAMP Screw connector Lamp connection 2/8 DocID024443 Rev 1