A4401

www.DataSheet4U.com 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 components ▪ 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 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. Package: 8-pin narrow SOIC (suffix L) Internal diagnostics provide comprehensive 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 A4401 GD ECU EN ISS 0V...