ST Life.augmented

L6520

Low Voltage Smart Ballast Controller
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The L6520/1 is the first highly integrated ballast controller in the market able to drive both BJTs and MOSFETs, providing all the necessary protections to ensure the maximum reliability of the application in compliance with major safety and power consumption regulations.

By adopting BJTs switches in the application, the IC allows to replace more expensive MOSFETs, strongly reducing the system cost without compromises.

The IC represents also the best and cost effective solution to replace self oscillating solutions when the key requirement is the reliability of the ballast. The benefits are an increased MTBF and a reduction of the costs due to the return from the field.

The higher level of flexibility and integration provided allows the possibility to quickly design ballast with any kind of lamp topology/size/power, without limitations. Depending on the power of the lamp, the IC can work without PFC, with passive PFC or with active PFC. In the latter case the L6562A from STMicroelectronics is the suggested IC for the most cost effective solution.

The IC is fully programmable using only resistors and offers over current protections, choke saturation control and hard switching protection thanks to a sophisticated current control circuit (CCC). In ignition, the CCC limits both the maximum lamp voltage in case of old or broken lamp, and also the lamp current in case of inductor saturation.

When the IC is driving bipolar transistors, a variable dead time ensures the correct base discharge time avoiding cross conduction phenomena. Moreover, the IC prevents the failure due to the lamp's end of life (EOL).

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Errata Sheet
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Datasheet

Key Features

  • Half bridge circuit able to drive both BJT and MOSFET transistors
  • Very accurate oscillator precision in wide operating temperature range
  • BJTs' storage time compensation
  • Preheated start and instant start
  • Hard switching protection
  • Overcurrent / voltage protection
  • Choke saturation control
  • End-of-life protection
  • Programmable without capacitors

Circuit Diagram

Design Resources

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Technical Documentation

Product Specifications

Description Version Size
pdf
DS6681: Highly integrated ballast controller for TL and CFL
3.2 321 KB

Application Notes

Description Version Size
pdf
AN1902: VIPower: HF converter based on VK06TL devices to drive 58W TL tubes
1.1 1,372 KB
pdf
AN2018: VIPower: 18 - 23W electronic ballast for removable tubes
1.1 139 KB

Related Tools and Software

Related Tools and Software

Part Number Description
EVAL6520-1421 14 W / 21 W T5 miniature ballast driven by L6520 and STT13005D bipolar transistors
EVAL6520-254 2x54 W / T5 BALLAST DRIVEN BY THE L6520 AND BUL310 BIPOLARS

Publications and Collaterals

Flyer

Description Version Size
pdf
L652x: the most reliable solution for fluorescent lamps
1.0.0 809 KB

Sample & Buy

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Part Number Marketing StatusPackagePacking TypeAutomotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
L6520ActiveSO-8Tube_-.611No availability reported, please contact our Sales officeEcopack1PDF
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L6520TRActiveSO-8Tape And Reel_-.611No availability reported, please contact our Sales officeEcopack1PDF
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L6521ActiveSO-8Tube_-.611No availability reported, please contact our Sales officeEcopack1PDF
XML
L6521TRActiveSO-8Tape And Reel_-.611No availability reported, please contact our Sales officeEcopack1PDF
XML

(*) 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 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.
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