STMicroelectronics L6574 Manuals

The L6574 is a high voltage driver chip for lamp ballasts, with features such as high voltage, immunity to high-speed voltage changes, and strong driving capability.

The L6574 is a high voltage driver designed for lamp ballast applications. It is manufactured with BCD OFF LINE technology to ensure voltage ratings above 600V. The L6574 is capable of driving two power MOS-FETs in a half bridge topology to drive and control a fluorescent bulb. It features a dedicated timing section for pre-heat and ignition of the lamp, as well as a sense op amp for closed loop control or protection. The integrated bootstrap section and clamping on VS make the L6574 suitable for low cost applications.

This document describes a 20W dimmable CFL (compact fluorescent lamp) ballast solution that can completely replace incandescent lamps in dimming systems. The dimming range of this solution is from below 20% up to 100% of full light output without changing the triac dimmer. Compared to traditional CFL designs, this dimmable solution not only provides energy savings but also higher reliability and longer operating life.

The L6574 is a high voltage driver chip suitable for lamp ballasts. It has high voltage and dV/dt immunity, providing 250mA driver current and 450mA sink current. The chip integrates features such as CMOS shutdown input, undervoltage lockout, preheat and frequency shifting timing, closed loop control, and protection.