Synchronous buck powertrain design is one of the most widely used converter topologies today. However, selecting the right powertrain components for a medium to low voltage synchronous buck converter can be quite challenging. Engineers are often overwhelmed by the vast number of available power MOSFETs, and traditional quality factor (FOM) comparisons rarely provide the best balance between efficiency and cost. When looking at the bigger picture, using conventional methods requires actual circuit loss and energy efficiency data for accurate comparisons—making the process both time-consuming and labor-intensive.
Designing passive components such as output inductors, capacitors, and buffers through manual calculations adds to the complexity. To address these challenges, ON Semiconductor has introduced a new synchronous buck powertrain design tool that streamlines the entire design process. This tool offers comprehensive system design and analysis, helping engineers complete their solutions more efficiently.
The new synchronous buck powertrain design tool provides a full system-level approach, covering power MOSFETs, output inductors, capacitors, and optional buffering. It operates similarly to Power Supply WebDesigner, allowing users to input their system requirements, click "Auto-Complete," or use a guided design process to fine-tune each step. The tool generates schematics, a bill of materials (BOM), and detailed design reports, including loss and energy efficiency analysis. It also includes helpful "information comments" without requiring reference to application notes.
Based on FETBench technology, the tool supports MOSFETs up to 250V BVDSS in single, dual symmetrical, and dual stage asymmetrical configurations. For maximum flexibility, it can be used with any controller or driver of your choice.
The tool enables fast automatic design or step-by-step tuning. It automatically searches through a comprehensive MOSFET database, guiding device selection and recommending high-side and low-side switches that meet your system requirements. Users can choose from a pre-sorted list of suitable devices, and parameter data, losses, and junction temperatures for different FETs can be quickly compared. It then recommends an appropriate inductor code and specifies output capacitors based on system needs. An RC buffer for the switch node can also be specified.
The tool improves accuracy by adjusting PCB designs through MOSFET loss calculations, including iterative Rds(on) versus temperature effects and optional custom thermal impedance. You can input your preferred controller/driver parameters, such as independent gate drive voltages, source/Drain resistance, delay times, and gate damping resistors, for higher precision. It delivers detailed loss and energy efficiency analysis, including conduction, switching, and reverse recovery losses for MOSFETs. Total powertrain losses are analyzed per component, and loss and efficiency maps are generated for various input and load conditions.
This powerful tool is the result of decades of experience from ON Semiconductor engineers. With all these features and flexibility built-in, you'll be able to develop your powertrain solution faster and with less effort.
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