Vishay Siliconix SIC431BEVB-A

Overview

SIC431BEVB-A from Vishay Siliconix is an evaluation board for the SiC431B 24 A synchronous buck DC/DC converter IC, supporting 3 V–24 V input and adjustable 0.6 V–20 V output. It implements voltage-mode constant-on-time (VM-COT) control with ultrasonic light-load mode, integrated high-side (6 mΩ) and low-side (2 mΩ) MOSFETs, and full protection including OVP, OCP, UVP, OTP, and PGOOD. Designed for rapid prototyping of point-of-load (POL) supplies in server, industrial computing, and telecom applications.

For engineers reviewing the SIC431BEVB-A datasheet, SIC431BEVB-A pinout, SIC431BEVB-A application, or SIC431BEVB-A equivalent, this board enables validation of SiC431B's fast transient response (<50 ns min on-time), ±1% output accuracy over –40°C to +125°C, 97% peak efficiency at 12 V_IN/1.2 V_OUT, and programmable 300–1000 kHz switching frequency before system integration.

Technical Context

The SIC431BEVB-A implements the SiC431B's VM-COT architecture with internal ramp generation and dual-path feedback-fast ripple injection for sub-μs transient correction and slow error amplifier loop for precise DC regulation. It supports pre-bias startup, output voltage tracking/sequencing, and three operating modes (forced CCM, power save, ultrasonic) selected via MODE1/MODE2 resistors.

This board validates the SiC431B's integrated power stage delivering 24 A continuous current with <25 μs PGOOD assertion delay, 150°C thermal shutdown with 35°C hysteresis, and cycle-by-cycle overcurrent protection triggered at ±20% valley current deviation-enabling robust operation in high-density 5 V/12 V/24 V POL rails.

Key Specifications

Availability

SIC431BEVB-A is available at Aetrix Electronics and suitable for server power delivery, industrial computing POLs, and telecom infrastructure requiring stable component supply and rapid design validation cycles.

Supply support for SIC431BEVB-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-efficiency power management solutions for demanding industrial, computing, and telecom applications.

The SiC431B IC on SIC431BEVB-A belongs to Vishay's microBUCK® family-designed specifically for high-current, high-density point-of-load conversion with minimal external components and ultrafast transient response in space-constrained systems.

FAQ

What is the primary function of the SIC431BEVB-A evaluation board?

The SIC431BEVB-A is a fully assembled evaluation board for the SiC431B 24 A synchronous buck regulator IC. It enables engineers to validate key performance metrics-including efficiency, transient response, soft-start behavior, and protection features-under real-world conditions before integrating the SiC431B into final PCB designs. The board includes all necessary passives, layout-optimized power planes, and test points for direct oscilloscope probing of SW, VOUT, PGOOD, and EN signals.

Which SiC431 variant does the SIC431BEVB-A support, and how is it configured?

The SIC431BEVB-A is configured for the SiC431BED-T1-GE3 (SiC431B) variant, which uses internal VDD/VDRV generation and power-saving light-load mode. Jumper settings and default resistor values on the board set MODE1 for 500 kHz switching frequency and MODE2 for 24.8 A current limit (RMODE2 = 200 kΩ). This matches the SiC431B's specification sheet configuration and allows immediate out-of-box testing without component changes.

Does the SIC431BEVB-A support pre-bias startup and output voltage sequencing?

Yes, the SIC431BEVB-A fully supports pre-bias startup and output voltage sequencing as implemented by the SiC431B IC. The board's FB network and EN timing allow validation of controlled ramp-up when VOUT is pre-charged, preventing negative current spikes. Sequencing is enabled via the EN pin and configurable MODE pins-verified using the board's test points and included schematic (Fig. 39 in Doc #74589).

How is thermal performance validated on the SIC431BEVB-A?

Thermal performance of the SiC431B on SIC431BEVB-A is validated using the board's exposed thermal pad connected to an internal copper pour and external heatsink interface. The SiC431B's 150°C OTP trip and 35°C hysteresis are confirmed via thermal camera imaging and junction temperature monitoring during sustained 24 A load tests. Board layout follows Vishay's MLP44-24L thermal guidelines, achieving ≤16°C/W θ_JA under forced-air cooling.

Can the SIC431BEVB-A be used to evaluate different output voltages and frequencies?

Yes-the SIC431BEVB-A supports full parametric evaluation. Output voltage is adjusted via the R_{FB_H}/R_{FB_L} divider (default 1.2 V); switching frequency is changed by replacing R_MODE1 per Table 1 (300/500/750/1000 kHz options); and light-load mode is toggled by modifying R_MODE2. All resistor pads and test points are accessible, enabling rapid reconfiguration without soldering modifications.