To ensure rated voltage over 600V, the L6574 is manufactured with BCD off-line technology, which makes it ideal for lamp ballast applications. The device is designed to drive two power MOSFets using a classic half-bridge topology that ensures all the functions required to drive and properly control fluorescent bulbs.
The L6574 has a dedicated timing section where the user can set the necessary parameters for proper warm-up and ignition.
In addition, an operational amplifier is provided for closed-loop control of lamp current during normal lamp burning.
The integrated bootstrap part eliminates bootstrap diodes and zener clamps typically required on Vs, making the L6574 ideal for low-cost applications where few additional components are required to build high-performance ballasts.
All functions
High precision current control oscillator
Sensing operational amplifiers for closed loop control or protection functions
Clamp.
Integrated bootstrap diode
SO16, DIP 16 packs
Under-voltage lockout
CMOS off input
High pressure rail up to 600V
Driver current capability: 250 mA power supply 450 mA receiver \t
The dV/ DT immunity is ±50 V/ns over the whole temperature range
The load of 1 nf
Preheating and frequency shift timing
Switching time 80/40ns up/down