SI8284-KIT Silicon Labs

UG482: Si8284v2-EVB User s Guide This document describes the operation of the Si8284v2-EVB. KEY FEATURES The Si8284 Evaluation Kit contains the following items: Si8284 low voltage side connections Si8284v2-EVB DC-DC Operation Si8284DD-IS installed on the evaluation board Si8284 isolated gate drive connections Kit Capabilities Gate Current Boost Option Demonstrates driver functionality Alternative Configurations Demonstrates operating with a Capacitive Driver Load Demonstrates switching with a SiC FET, IGBT, or Si MOSFET (not included) This document includes: Board configuration details Feature descriptions Schematics Layout Bill of materials silabs.com Building a more connected world. Rev. 0.1 Table of Contents 1. Overview and Setup.............................3 1.1 Hardware................................3 1.1.1 Si8284 Low Voltage Side Connections ....................4 1.1.2 DC-DC Operation ...........................5 1.1.3 Si8284 Isolated Gate Drive Connections....................5 1.2 Configurations..............................6 1.2.1 Gate Current Boost...........................6 1.2.2 Positive Voltage Gate Drive Only ......................6 1.2.3 Alternate VDDB Voltage .........................6 2. Demonstrating Driver Functionality.......................7 2.1 Driving a Capacitive Load ..........................8 2.2 Operating with a Switching MOSFET Installed ...................10 2.2.1 Installing a Switching MOSFET.......................10 2.2.2 Testing the MOSFET Response with a Capacitive Load (Short-Circuit test) ........11 2.2.3 Testing the MOSFET Response with an Inductive Load (Double-Pulse Test) .......14 2.2.4 Tuning Gate Resistor Values........................16 3. Features ................................ 17 3.1 DESAT Speed up/Disable ..........................17 3.2 DESAT Threshold.............................17 3.3 Soft Shutdown Duration...........................17 3.4 Source Current Viewing Port .........................18 3.5 FET Gate Observation ...........................19 3.6 FET Drain Observation ...........................19 3.7 Gate Drive Test Load............................19 3.8 Switch Device Q1/Q8 Heatsink ........................19 3.9 Secondary Side Supply Voltage Modification Using JP12................19 3.10 Quick Reference Table...........................20 4. Schematics ............................... 21 5. Layout................................. 25 6. Bill of Materials .............................28 7. Ordering Guide .............................33 8. Revision History ............................. 34 silabs.com Building a more connected world. Rev. 0.1 2