L6574 CFL/TL Ballast Driver Preheat and Dimming Evaluation Board

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%.

Key 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



EVAL6574B ×


Technical Documentation

Product Specifications
Description Version Size
DB1929 DB1929: CFL/TL ballast driver preheat and dimming demonstration board based on the L6574 1.0 393 KB
Application Notes
Description Version Size
AN993 AN993: Electronic ballast with PFC using L6574 and L6561 10.3 1 MB

Hardware Resources

Board Manufacturing Specifications
Description Version Size
PCB layout 1.0 84 KB
Schematic Pack
Description Version Size
EVAL6574B schematic 1.0 102 KB


License Agreement
Description Version Size
Evaluation products license agreement 1.4 128 KB
Support & Community

Sample & Buy

Part Number Core Product Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors

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Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
EVAL6574B ActiveCARDIndustrialNot compliant

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.