ST Life.augmented


L6574 CFL/TL Ballast Driver Preheat and Dimming Evaluation Board
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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%.

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Errata Sheet
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Data Brief

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



Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1929: CFL/TL ballast driver preheat and dimming demonstration board based on the L6574
1.0 393 KB

Application Notes

Description Version Size
AN993: Electronic ballast with PFC using L6574 and L6561
10.3 1,402 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
PCB layout
1.0 84 KB

Schematic Pack

Description Version Size
EVAL6574B schematic
1.0 103 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
EVAL6574BActiveL6574-Distributor reported inventory date: 2016-02-09
Distributor NameRegionStockMin. order
Not compliant-

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on 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.
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