STMicroelectronics STEVAL-ISA167V1

Overview

STEVAL-ISA167V1 from STMicroelectronics is an evaluation board designed to demonstrate the SRK2001 adaptive synchronous rectification controller for LLC resonant converters, featuring dual high-current gate drivers, 4.5–32 V VCC range, up to 500 kHz operation, and integrated STL85N6F3 PowerFLAT 60 V/6.5 mΩ N-channel MOSFETs for full-wave secondary-side rectification in center-tapped transformer topologies.

For engineers reviewing the STEVAL-ISA167V1 datasheet, STEVAL-ISA167V1 pinout, STEVAL-ISA167V1 application, or STEVAL-ISA167V1 equivalent, this board enables rapid validation of adaptive turn-on/turn-off timing, ZCD_OFF–triggered fast turn-off under above-resonance conditions, interlocked dual-MOSFET drive, and replacement of diode-based rectifiers in high-efficiency 12 V/24 V output LLC power supplies.

Technical Context

The board implements the SRK2001 IC's proprietary adaptive control algorithm that senses drain-source voltage (V_DS) transitions on each SR MOSFET to determine optimal conduction windows-eliminating fixed delays or external timing components. It supports both continuous and discontinuous conduction modes in LLC converters with center-tapped secondaries.

Each gate driver delivers >1 A peak current with matched propagation delay (<25 ns), and the interlock logic ensures <10 ns dead-time between GD1 and GD2 outputs to prevent shoot-through. The ZCD_OFF comparator provides sub-100 ns turn-off response during fast load transients or above-resonance operation.

Key Specifications

Availability

STEVAL-ISA167V1 is available at Aetrix Electronics and suitable for LLC resonant converter development, high-efficiency AC-DC adapter qualification, and industrial SMPS design requiring stable component supply and proven synchronous rectification reference implementation.

Supply support for STEVAL-ISA167V1 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, analog devices, and silicon solutions for automotive, industrial, and consumer markets.

The STEVAL-ISA167V1 belongs to ST's power conversion evaluation platform family, developed specifically to accelerate adoption of adaptive synchronous rectification in high-efficiency LLC resonant converters targeting data-center PSUs, telecom rectifiers, and industrial power supplies.

FAQ

What is the primary function of the SRK2001 controller on this board?

The SRK2001 is an adaptive synchronous rectification controller optimized for LLC resonant converters with center-tapped secondary windings. It senses V_DS of each SR MOSFET to autonomously determine turn-on and turn-off timing, eliminating need for external timing circuits while maintaining high efficiency across variable load and frequency conditions.

Can STEVAL-ISA167V1 be used with non-ST LLC controllers?

Yes - the board interfaces via standard gate-drive signals and VCC/GND pins, making it compatible with any primary-side LLC controller (e.g., L6699, UCC25630, IRS2795) as long as the transformer secondary uses a center-tap configuration and output voltage falls within the SRK2001's 4.5–32 V VCC range and 60 V MOSFET rating.

Does the board support parallel SR MOSFET configurations?

No - the STEVAL-ISA167V1 integrates two single STL85N6F3 MOSFETs in PowerFLAT 5x6 packages, each driven by one dedicated gate output (GD1/GD2). It does not include layout provisions, current-sharing resistors, or thermal design for paralleling additional MOSFETs beyond the onboard pair.

Is the SRK2001's adaptive algorithm configurable via external components?

No - the SRK2001's turn-on/turn-off adaptation is fully internal and unconfigurable; only the PROG pin sets maximum allowable duty cycle via a resistor divider, and EN enables/disables the entire controller. No external timing capacitors, trim pots, or digital interface exist for tuning the adaptive logic.