A4401 Automotive Quasi-Resonant Flyback Control IC

This device provides all the necessary control functions to provide the power rails for driving a Vacuum Fluorescent Display (VFD) using minimal external components. The power supply is based on a quasi-resonant, discontinuous flyback converter, operating near the critical conduction boundary. A novel adaptive turn-on control scheme is used to optimize the turn-on and turn-off phase of the MOSFET to reduce EMI emissions while minimizing switching losses.
The converter is self-oscillating, operating at switching frequencies depending on the input voltage, load, and external components. An onboard linear Regulator that is powered directly from the battery provides the housekeeping supply, avoiding the need for complex bias supplies.
By Allegro MicroSystems, Inc.
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A4401 Application circuits
A4401 circuits
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