STMicroelectronics lança regulador de alternador LIN avançado compatível com VDA

STMicroelectronics launches advanced VDA-compatible LIN alternator regulator

STMicroelectronics has released the L9918 automotive alternator regulator, with enhanced features to ensure the stability of 12V vehicle electrical systems.

The regulator contains a MOSFET to supply an alternator excitation current and a freewheeling diode to control the rotor current when the excitation is turned off. Closed-loop operation with load response control (LRC) and feedback LRC maintains consistent voltage as the vehicle's overall power demand continually changes.

The excitation MOSFET can supply up to 13A to the coil, which is more than typical alternative regulators can supply, improving response to fluctuating demands. Furthermore, utilizing the latest manufacturing process technology, the MOSFET has superior RDS(on), minimizing power dissipation and increasing efficiency.

With integrated non-volatile memory (NVM), the L9918 allows customers to program parameters including voltage setpoint and alternator characteristics. It can be used with alternators that have up to nine pole pairs, providing more flexibility than other regulators to suit a wide variety of charging applications.

Also integrating a local interconnect network (LIN) bus interface, the L9918 is easily connected to the vehicle's electrical/electronic infrastructure to be managed by an external electronic control unit (ECU). The ECU commands settings, including target voltage, and reads status and diagnostic information.

The L9918's failsafe and safety features include phase signal auto-start activation, which independently maintains the alternator voltage setpoint if the LIN connection is lost for any reason. The regulator returns control to the ECU when communication is restored. Current limiting, overcurrent protection, and thermal protection are also integrated, as well as thermal compensation that automatically adjusts the target voltage as the system temperature changes.

Conforming to the LIN VDA (Verband der Automobilindustrie) alternator regulator specification, the L9918 is AEC-Q-100 qualified, ISO26262 compliant and ready for use in functional safety systems.

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