Traditional 12V and 24V power networks are increasingly revealing limitations to meet the increasing power demands and complex functional requirements of modern vehicles. At this time, the 48V power supply system has become a new direction for the development of electric vehicles in the future with its unique advantages.
The rise of 48V systems is no accident. With the deepening of the degree of intelligent and electrified vehicles, the demand for electricity in vehicles is increasing exponentially. From the operation of advanced driver assistance systems (ADAS) to the various comfort features in the vehicle such as seat heating, ventilation and more powerful infotainment systems, a stable and sufficient power supply is required. The 12V and 24V power networks have high loads and excessive current, which not only leads to increased energy losses, but also complicates wiring and reduces reliability. The 48V system reduces energy loss by reducing the current level, while simplifying the wiring structure and improving system efficiency. In addition, it can support more advanced functions to improve the driving experience of passengers.
In response to this industry change, Infineon Technologies has launched the Power PROFET+ 24/48V switch family. Designed to meet the demanding demands of modern automotive power systems, this series is another innovation in Infineon's automotive electronics.
Housed in a compact TO leadless package, the switches include two high-side switch variants: BTH50030-1LUA and BTH50015-1LUA, with RDS(ON) as low as 3.0 mOhm and 1.5 mOhm, respectively. Such low on-resistance offers significant advantages in high-current applications, dramatically reducing power losses, making it ideal for today's automotive electrical systems, as well as commercial, hybrid, and next-generation electric vehicles. By integrating these switches into their vehicles, automakers can significantly improve driving safety, energy efficiency, and ride comfort.
Figure: Infineon helps upgrade automotive electrical systems
The highly integrated features of the Power PROFET+ 24/48V switch family incorporate resettable and diagnostic functions to ensure optimal performance in demanding environments. With an ultra-low on-resistance of 1.5 milliohms, for example, it excels in high-current applications and can operate stably even in extreme temperature environments such as inside the vehicle and in the engine compartment. Moreover, the durability of these switches is excellent, with more than 1 million switching cycles, far exceeding the service life of traditional relays of 200,000 times, providing excellent reliability for the vehicle's electrical system.
In terms of safety performance, the series switches have built-in multiple protection and diagnostic functions such as short circuit, over-current and over-temperature protection. The advanced fault detection function realized by the diagnostic signal can effectively prevent power failures and greatly improve the reliability of the whole vehicle. The 8-pin TO leadless package has a 23% smaller footprint than the D2PAK package, but still maintains similar thermal performance. In addition, the load current detection accuracy is up to ±5% after calibration, which can be easily determined by the analog voltage reading on the IS pin, which is convenient and accurate. In addition, the switch series is PRO - SIL™ ISO 26262 compliant and comes with a safety application note to support hardware evaluation in accordance with ISO 26262.
In order to make it easier to integrate these switches into automotive electrical systems, Infineon offers an online simulation tool, Automotive Power Explorer, in its Developer Center. With this tool, engineers can easily calculate intrinsic fuse characteristics and visualize the sensing current range at a specific load current, ensuring accurate and efficient application of switches in automotive electrical systems.
Infineon's Power PROFET+ 24/48V switch family, with its outstanding performance, reliable safety and easy integration, will undoubtedly play an important role in the wave of automotive electrical system upgrades, driving the hybrid and electric vehicle industry to a new stage of development.
