E-L6574D

Overview

The E-L6574D is a fluorescent lamp ballast controller manufactured using BCD OFF LINE technology, enabling voltage ratings exceeding 600V. It drives two power MOSFETs in a half-bridge topology and includes a dedicated timing section for preheat and ignition. An operational amplifier supports closed-loop current control during normal operation. The device features an integrated bootstrap diode, eliminating external components. Key electrical parameters include a driver capability of 250mA source and 450mA sink, dV/dt immunity of ±50 V/ns with a 1nF load, and switching times of 80ns rise and 40ns fall.

Feature Summary

• Integrated bootstrap section eliminates the need for external bootstrap diodes and Zener clamping on Vs.
• Dedicated timing section allows user setting of parameters for proper lamp preheat and ignition.
• Built-in sense operational amplifier enables closed-loop control or protection of lamp current.
• High dV/dt immunity ensures stable operation across the full temperature range.

Applications

• Fluorescent lamp ballasts
• Half-bridge topology circuits driving power MOSFETs

Procurement Notes

Verify the specific suffix 'D' against official STMicroelectronics documentation to confirm package type and material compliance. Ensure the component matches the required BCD OFF LINE technology specifications for high-voltage applications. Cross-reference the datasheet revision date to confirm availability of all listed features such as the integrated bootstrap diode and CMOS shut down input.

Selection Notes

Select this component for designs requiring high voltage rail capabilities up to 600V without complex external bootstrapping. The integrated op amp simplifies closed-loop current control implementation. Consider the SO16 or DIP16 packages based on thermal and space constraints. Verify that the 250mA source and 450mA sink driver currents meet the gate drive requirements of the target power MOSFETs.

Part Context

The L6574 series is designed specifically for lighting applications, utilizing BCD technology to handle high voltages. It integrates oscillator, driver, and control functions into a single chip. The E-L6574D variant maintains these core functionalities while adhering to specific manufacturing standards. It serves as a complete solution for controlling fluorescent lamps efficiently.

Replacement Considerations

Consult official STMicroelectronics substitution guides for verified alternatives. Generic replacements may lack the integrated bootstrap diode or specific dV/dt immunity characteristics. Ensure any substitute supports the same half-bridge topology and preheat timing requirements.

FAQ

Does the E-L6574D require an external bootstrap diode?

No, the device features an integrated bootstrap section that eliminates the need for an external bootstrap diode and Zener clamping on Vs.

What is the dV/dt immunity specification?

The device offers dV/dt immunity of ±50 V/ns in the full temperature range with a 1nF load.