Vishay Siliconix SIC461EVB

Overview

SIC461EVB from Vishay Siliconix is an evaluation board for the SiC461 10 A synchronous buck DC/DC converter, supporting 4.5 V to 60 V input and adjustable 0.8 V output. It implements voltage-mode constant-on-time (COT) control with ultrasonic mode enablement, integrated high-side/low-side MOSFETs in MLP55-27L package, and full protection including OCP, OVP, UVP, OTP, and PGOOD. Designed for rapid validation of industrial, telecom, and robotics power stages.

For engineers reviewing the SIC461EVB datasheet, SIC461EVB pinout, SIC461EVB application, or SIC461EVB equivalent, this board enables fast functional verification of SiC461-based microBUCK® designs-particularly for wide-input industrial supplies, server point-of-load conversion, and battery-powered systems requiring programmable soft-start, tracking, and light-load efficiency optimization.

Technical Context

The SIC461EVB implements the SiC461's 10 A power stage with integrated n-channel high-side and low-side MOSFETs, operating at up to 2 MHz switching frequency using voltage-mode COT control with adaptive zero-current detection. It supports three operation modes (forced CCM, power-save, ultrasonic) via MODE and ULTRASONIC pins, and uses external RC networks on fSW, ILIMIT, SS, and VSNS for frequency, current limit, soft-start, and ripple injection tuning.

Board-level features include VIN decoupling with ceramic capacitors, BOOT resistor selection per SiC461 requirements (≥4.7 Ω), VCIN RC filter, AGND/PGND separation per layout guidelines, and provision for external VDRV biasing in Mode 3/4. The design validates SiC461's ability to maintain stability with low-ESR ceramic output capacitors and achieve ±1% VOUT accuracy across –40 °C to +125 °C.

Key Specifications

Availability

SIC461EVB is available at Aetrix Electronics and suitable for industrial automation, telecom power supply development, and robotics embedded power system validation requiring stable component supply, pre-validated layout, and full-feature functional demonstration.

Supply support for SIC461EVB 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-efficiency power ICs, MOSFETs, and precision analog solutions for demanding industrial and computing applications.

The SiC46x family-including the SiC461 supported by SIC461EVB-is designed as a scalable, wide-input synchronous buck regulator platform targeting high-density, high-reliability power conversion in servers, base stations, and automated equipment where input rail variability and transient response are critical.

FAQ

What is the primary purpose of the SIC461EVB evaluation board?

The SIC461EVB is a reference design board built to evaluate the SiC461 10 A synchronous buck regulator. It provides a fully assembled, tested implementation of the SiC461's power stage, control logic, and protection circuitry-including VIN decoupling, BOOT network, feedback divider, soft-start capacitor, and VSNS ripple injection components-enabling engineers to validate performance, optimize loop compensation, and verify thermal behavior before custom PCB design. The SIC461EVB directly supports functional testing of the SIC461 under real-world load, line, and temperature conditions.

Does the SIC461EVB support all SiC461 operating modes?

Yes, the SIC461EVB supports all three SiC461 operational modes: forced continuous conduction mode (CCM), power-save mode (diode emulation + frequency foldback), and ultrasonic mode (minimum 20 kHz switching to eliminate audible noise). Jumper options and resistor pads allow configuration of the MODE and ULTRASONIC pins per Vishay's specification table, enabling direct validation of light-load efficiency improvements and transient response trade-offs across modes. The SIC461EVB's layout and component selection are optimized for stable operation in each mode.

Can the SIC461EVB be used to evaluate output voltage tracking or sequencing?

Yes, the SIC461EVB supports output voltage tracking and pre-bias startup as specified for the SiC461. Its VFB node is accessible for connection to external tracking circuits (e.g., using a resistor divider tied to another supply rail), and the EN pin is routed for controlled power-up sequencing. The board's design preserves the SiC461's internal tracking capability-verified in Vishay's application notes-and allows validation of multi-rail systems such as FPGA or ASIC core/logic supplies where coordinated ramp rates and monotonic startup are required. This functionality is inherent to the SIC461EVB's interface to the SIC461 device.

What protection features of the SiC461 are demonstrated on the SIC461EVB?

The SIC461EVB demonstrates all key SiC461 protections: over-current protection (OCP) via ILIMIT resistor configuration, output overvoltage protection (OVP) triggered at 0.96 V on VFB, output undervoltage protection (UVP) at 0.16 V on VFB with auto-retry, overtemperature protection (OTP) at 150 °C junction with 35 °C hysteresis, and open-drain PGOOD signaling. These are implemented using the SiC461's native circuitry-no external ICs-allowing direct observation of fault flags, shutdown behavior, and recovery timing. The SIC461EVB's test points and jumper-accessible pins facilitate real-time monitoring of these protections during stress testing.

Is the SIC461EVB compatible with Vishay PowerCAD simulation tools?

Yes, the SIC461EVB is fully aligned with Vishay PowerCAD online design simulation tools. Its bill-of-materials-including the SiC461 IC, recommended inductor (e.g., 1.5 μH), input/output capacitors, BOOT resistor (≥4.7 Ω), and VSNS network components-matches PowerCAD's reference design parameters for the SiC461. Engineers can import SIC461EVB schematics into PowerCAD to simulate efficiency, thermal performance, loop stability, and transient response, then correlate results with hardware measurements. This integration ensures the SIC461EVB serves as both a physical validation platform and a simulation-anchored reference for the SIC461.