Vishay Siliconix SIC472EVB-A

Overview

SIC472EVB-A from Vishay Siliconix is an evaluation board for the SiC472 8 A synchronous buck DC/DC converter, designed to demonstrate high-efficiency power conversion from 4.5 V to 55 V input to adjustable output voltages down to 0.8 V. It supports 2 MHz switching, ultrafast transient response with ceramic output capacitors, and full protection features including OCP, OVP, UVP, SCP, and OTP - validated in industrial computing and telecom power supply applications.

For engineers reviewing the SIC472EVB-A datasheet, SIC472EVB-A pinout, SIC472EVB-A application, or SIC472EVB-A equivalent, this board enables rapid validation of SiC472-based microBUCK® designs, verification of ripple injection (VSNS/VRAMP) stability, soft-start timing, power-good sequencing, and light-load efficiency modes (power save vs. ultrasonic).

Technical Context

The SIC472EVB-A implements the SiC472 IC in its native MLP55-27L package with all critical support circuitry: VCIN RC filter, BOOT resistor/capacitor network, external R_fsw, R_ILIM, R_MODE, and ULTRASONIC pull-up; it includes populated feedback divider (R_UP/R_DOWN), compensation network (R_COMP/C_COMP), and VRAMP components (R_x/C_x/C_y) optimized for stable operation across CCM/DCM/ultrasonic modes.

It provides direct access to all 30 pins of the SiC472 via test points and solder jumpers, enabling real-time monitoring of PHASE, SW, COMP, VSNS, and PGOOD signals, and supports pre-bias startup, output voltage tracking, and programmable soft start - all verified per Vishay's S25-1437-Rev. J design guidelines.

Key Specifications

Availability

SIC472EVB-A is available at Aetrix Electronics and suitable for industrial computing, telecom power supplies, and robotics requiring stable component supply, fast prototyping cycles, and verified reference design fidelity.

Supply support for SIC472EVB-A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay Siliconix is a global leader in discrete semiconductors and passive components, specializing in high-performance power management solutions with emphasis on efficiency, reliability, and thermal performance.

The SiC47x family - including the SiC472 targeted by SIC472EVB-A - was designed for wide-input, high-current point-of-load regulation in space-constrained industrial, telecom, and computing systems where fast transient response and ceramic-cap compatibility are mandatory.

FAQ

What is the primary function of the SIC472EVB-A evaluation board?

The SIC472EVB-A evaluation board is a fully assembled, tested reference design platform for the Vishay SiC472 8 A synchronous buck regulator. It enables engineers to validate key performance metrics - including efficiency across 4.5–55 V input, transient response with ceramic output capacitors, soft-start behavior, power-good signaling, and protection activation thresholds - without custom PCB development. The SIC472EVB-A directly implements the SiC472's recommended layout, component selection, and compensation network per Vishay document S25-1437-Rev. J.

Does the SIC472EVB-A support ultrasonic mode operation for the SiC472?

Yes, the SIC472EVB-A supports ultrasonic mode via the ULTRASONIC pin (Pin 18). When pulled to VDD, it enforces a minimum 20 kHz switching frequency during discontinuous conduction mode to eliminate audible noise - a feature confirmed in the SiC472's operational description and implemented with appropriate pull-up on the board. Floating ULTRASONIC disables this constraint, allowing operation down to hundreds of Hz in power-save mode. This configuration is user-selectable and verified per the SiC472EVB-A schematic.

Can the SIC472EVB-A be used to evaluate output voltage tracking and sequencing?

Yes, the SIC472EVB-A supports output voltage tracking and sequencing with pre-bias startup as specified for the SiC472 IC. Its design includes dedicated test points and jumper options for connecting external tracking control signals to the SS (Pin 19) and MODE (Pin 27) pins, enabling validation of multi-rail sequencing in server or FPGA power systems. This capability is explicitly listed in the SiC472's FEATURES section and implemented in the SIC472EVB-A's hardware architecture per Vishay's reference design guidance.

What protection features of the SiC472 are demonstrated on the SIC472EVB-A?

The SIC472EVB-A demonstrates all core SiC472 protections: overcurrent protection (OCP) via R_ILIM resistor (Pin 25), output overvoltage (OVP) and undervoltage (UVP) detection via VFB monitoring (Pin 22), short-circuit protection (SCP) with auto-retry, overtemperature protection (OTP) with 150 °C trip and 35 °C hysteresis, and input UVLO on VCIN/VDD/VDRV rails. These are implemented using the SiC472's internal circuitry and verified through fault injection testing per the SiC472 datasheet's Fault Protections table.

Is the SIC472EVB-A compatible with Vishay PowerCAD simulation tools?

Yes, the SIC472EVB-A is fully supported by Vishay PowerCAD online design simulation tools. Its component values - including R_fsw, R_ILIM, R_MODE, feedback divider, VRAMP network, and compensation network - match the default parameters used in PowerCAD for the SiC472 model. Engineers can import SIC472EVB-A configurations directly into PowerCAD to simulate efficiency, loop stability, transient response, and thermal performance before hardware testing.