Simyog Webinar on Buck Converter and Filters - Key to passing CISPR Compliance Standards

Overview

Buck converters are among the most widely used power electronics building blocks in automotive systems, and among the most common sources of EMC compliance failures. With over 50% of products failing their first EMC lab submission according to industry data, the cost of discovering and fixing emissions problems late in the design cycle — through repeated lab visits, board respins, and delayed time to market — has become a serious business problem.

In this webinar, SimYog demonstrates how simulation can replace much of this trial-and-error process for buck converter designs targeting CISPR 25 conducted and radiated emission compliance. Through a structured walkthrough covering filter topology optimization, IC-level noise reduction, and a detailed radiated emissions case study, the session shows how engineers can use Compliance-Scope® to make smarter design decisions — on both the PCB and IC side — before hardware is ever built.

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Key Topics Covered

• Why automotive EMC compliance failures are so common and what the design cycle cost looks like
• CISPR 25 conducted and radiated emission test methodology and simulation setup
• Modeling the buck converter DUT: PCB parasitics, passive components, and IC noise sources
• Three IC modeling approaches: measured waveforms, SPICE-based waveforms, and datasheet-based IC models
• Source and transfer function framework: how X(f), H(f), and Y(f) combine to predict emissions
• Common mode vs. differential mode diagnosis to identify dominant noise paths
• PCB-side filter optimization: comparing full EMI filter, pi filter, LC filter, and single CX capacitor topologies
• BOM reduction through simulation: achieving adequate filtering with fewer components
• Effect of capacitor placement on the PCB and how trace inductance influences emissions
• IC-side solutions: spread spectrum modulation, dithering percentage effects, and rise time variation
• Datasheet-based IC models: using switching parameters to predict and reduce emissions without hardware
• Radiated emissions case study: identifying and mitigating a 350 MHz failure using E-field plots and layout changes
• Non-standard cable modeling for both CE and RE setups
• Live demonstration of the full Compliance-Scope® workflow for CISPR 25 CE simulation

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Who Should Watch

• EMC/EMI Engineers
• Power Electronics and Hardware Designers working on DC-DC converters
• Automotive Electronics Engineers at semiconductor companies and Tier-1 suppliers
• Validation and Compliance Teams
• Engineers looking to reduce BOM cost while maintaining EMC compliance margins

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What You'll Learn

• How to set up a complete CISPR 25 conducted and radiated emission simulation in Compliance-Scope®
• How to use common mode and differential mode diagnostics to identify what is driving emissions failures
• How to evaluate multiple filter topologies in simulation to find the most cost-effective design that still passes compliance
• How datasheet-based IC models enable front-loading of EMC analysis before PCB fabrication
• How IC-level parameters — spread spectrum modulation, dithering, and switching rise time — can be varied in simulation to reduce emissions without PCB changes
• How E-field and current density diagnostic tools can pinpoint the source of radiated emission failures and guide layout fixes

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