Site Map • Contact Us
中文 • English

High-Performance Power ICs and Hall-Effect Sensors

• Search Allegromicro.com:
  
• Home
• Products
  • • Hall-Effect Sensors
    • Power ICs
    • Power Management
    • Sanken
  • Applications
    • Automotive
    • LED Lighting and Displays
    • Office Automation
    • Portable
  • Part Numbers
  • Design Center
  • Packaging
  • Store
• Corporate
  • About Us
  • Contact Us
  • Environment
  • Facilities
  • Jobs
  • Legal
    • Terms and Conditions
      of Sale
  • Press Room
  • Quality
• Sales
  • Americas
  • Europe
  • Asia Pacific
  • Japan
• Site Map
• Feedback

Related Links:

Datasheets:
A4401: Automotive Quasi-Resonant Flyback Control IC (PDF)

Selection Guides:
Automotive ICs

when this product is updated

Press Releases:
A4401: Allegro Introduces a New Automotive Grade Quasi-Resonant Discontinuous Flyback Converter Control IC

A4401
Automotive Quasi-Resonant Flyback Control IC

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.

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.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A4401KL-T	8-lead SOIC	Yes	view data	-40 °C to  125 °C	new	Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.
A4401KLTR-T	8-lead SOIC	Yes	view data	-40 °C to  125 °C	new	Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.