EVAL6574B Datasheet, PDF (1/8 Pages) STMicroelectronics – Dimmable fluorescent lamp ballast

EVAL6574B
CFL/TL ballast driver preheat and dimming demonstration board
based on the L6574
Data brief
EVAL6574B
Features
 Dimmable fluorescent lamp ballast
 Multiple T8 lamps application
 Wide range input (85 Vac – 265 Vac)
 PF > 0.99, THD < 10%
 Fault ignition protection
 Lamp absence detection
Description
This design was developed to drive a TL
fluorescent lamp of up to 58 W. It is composed of
two sections: the PFC using the L6561 controller,
and the ballast based on the L6574. The
application includes a current feedback that can
be used to control the power (and, if necessary,
the dimming function) by varying the switching
frequency during normal lamp operation. The
application also features safety circuitry which
activates when an open load or faulty lamp
ignition is detected. The PFC pre-regulator allows
connection of the application to a wide input
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
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