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 an integrated circuit designed to drive two power MOSFETs in a half-bridge topology for fluorescent lamp applications. It features BCD OFFLINE technology to support high voltage ratings exceeding 600V and includes a dedicated timing section for preheat and ignition sequences.
The device incorporates an integrated bootstrap section to eliminate the need for an external bootstrap diode and a sense op-amp for closed-loop control of lamp current. It provides high sink/source driving currents (450mA/250mA) to ensure fast switching times for external power MOSFETs.
| Operating Temperature Range | -40 to +125 °C |
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Preheat timing is set by connecting a capacitor to the CPRE pin, which is charged with a fixed current.
Yes, it features an integrated bootstrap section that replaces the external bootstrap diode.