L6574D

The L6574D is a preheat and dimming CFL/TL Ballast Driver with BCD offline technology. The device is intended to drive two power MOSFETS, in the classical half bridge topology, ensuring all the features needed to drive and properly control a fluorescent bulb. A dedicated timing section in the L6574 allows the user set the necessary parameters for proper preheat and ignition of the lamp. Also, an OP AMP is available to implement closed loop control of the lamp current during normal lamp burning. An integrated bootstrap section, eliminating the normally required bootstrap diode and the Zener clamping on Vs, makes the L6574 well suited for applications where few additional components are needed to build a high performance ballast.

• CMOS shutdown input
• Under-voltage lock out
• Preheat and frequency shifting timing
• Sense op amp for closed loop control or protection features
• High accuracy current controlled oscillator
• Integrated bootstrap diode
• dV/dt immunity of ±50V/ns in full temperature range
• Driver current capability - 250mA Source and 450mA sink
• 80/40ns Rise/fall switching time
• 1nF load

Applications

Lighting