A4401 Datasheet | Allegro MicroSystems

.. A4401 Automotive Low Noise Vacuum Fluorescent Display Power Supply Features and Benefits - Multiple output regulator - 7 to 40 V input supply - Low EMI conducted and radiated emissions - Adaptive quasi-resonant turn on/off control - Minimal number of external ponents - Enable input which can be driven with respect to the battery voltage Description This device provides all the necessary control functions to provide the power rails for driving a vacuum fluorescent display (VFD) using minimal external ponents. 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 ponents. An onboard linear regulator that is powered directly from the battery provides the housekeeping supply, avoiding the need for plex bias supplies. Package: 8-pin narrow SOIC (suffix L) Internal diagnostics provide prehensive protection against overloads, input undervoltage, and overtemperature conditions. The A4401 is supplied in an 8-pin narrow SOIC package (suffix L), which is lead (Pb) free, with 100% matte-tin leadframe plating. Approximate Scale 1:1 Typical Application +VBAT VIN LX VFD GD ECU EN ISS 0V 0V VA GND P A4401-DS .. Automotive Low Noise Vacuum Fluorescent Display Power Supply Selection Guide Part Number A4401KL-T A4401KLTR-T Tube, 98 pieces/tube Tape and reel, 3000 pieces/reel Packing- - Contact Allegro for additional packing...