Synchronous buck powertrain design is one of the most widely used converter topologies today, but selecting the right components for a medium or low-voltage synchronous buck converter can be a complex and time-consuming task. Engineers are often faced with an overwhelming number of power MOSFET options, and simple quality factor (FOM) comparisons rarely provide the best balance between efficiency and cost. Traditionally, designers have to rely on actual circuit loss data and energy efficiency measurements for comparison, which is both labor-intensive and inefficient. Similarly, manually calculating passive components like output inductors, capacitors, and buffers adds to the overall workload.
To address these challenges, ON Semiconductor has introduced a new synchronous buck powertrain design tool that streamlines the entire process. This powerful tool offers complete system design and analysis, covering power MOSFETs, output inductors, capacitors, and optional buffering solutions. It allows engineers to create a full powertrain solution quickly—whether by using the "Auto-Complete" feature or following a guided design flow. The tool provides detailed loss and efficiency analysis, along with schematics, a bill of materials (BOM), and comprehensive design reports. Additionally, it includes helpful "information comments" to guide users without needing to refer to application notes.
Built on the foundation of FETBench, the tool supports MOSFETs up to 250V BVDSS in single, dual symmetrical, and dual stage asymmetrical configurations. It also offers ultimate flexibility, allowing users to integrate any controller or driver of their choice. This makes it a versatile solution for a wide range of applications.
The tool features an intuitive "automatic design" function that searches through a comprehensive database of MOSFETs and recommends suitable high-side and low-side switches based on your system requirements. Users can also explore a pre-sorted list of devices and compare key parameters such as losses and junction temperatures. After selecting the optimal MOSFETs, the tool helps recommend a true inductor code and specifies output capacitors according to the system's needs. An RC buffer for the switch node can also be configured automatically.
One of the standout features of this tool is its ability to compare MOSFET performance with high accuracy. It adjusts PCB designs based on MOSFET loss calculations, including iterative Rds(on) vs. temperature effects and optional custom thermal impedance. You can input your preferred controller/driver specifications, such as independent gate drive voltages, source/ drain resistance, delay times, and gate damping resistors, to enhance the precision of the design. The tool also delivers detailed loss and efficiency analysis, including conduction, switching, and reverse recovery losses for each MOSFET.
Furthermore, it provides a comprehensive breakdown of total powertrain losses across all components and generates loss and efficiency maps under various input and load conditions. This level of detail helps engineers make informed decisions and optimize their designs effectively. With decades of power supply expertise embedded in the tool, ON Semiconductor has created a solution that significantly reduces design time and effort, making it easier than ever to develop efficient and reliable powertrain systems.
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