STMicroelectronics STEVAL-ISA165V1

Overview

STEVAL-ISA165V1 from STMicroelectronics is an evaluation board designed to demonstrate the SRK2001 adaptive synchronous rectification controller for LLC resonant converters, featuring dual N-channel MOSFET gate drive (STP120N4F6, 40 V / 4.3 mΩ), 4.5–32 V VCC range, and up to 500 kHz switching frequency in a TO-220-based layout.

For engineers reviewing the STEVAL-ISA165V1 datasheet, STEVAL-ISA165V1 pinout, STEVAL-ISA165V1 application, or STEVAL-ISA165V1 equivalent, this board enables rapid validation of adaptive turn-on/turn-off timing, interlocked dual-gate drive behavior, ZCD_OFF–triggered fast turn-off under above-resonance conditions, and full-wave rectification replacement in center-tapped LLC secondary stages.

Technical Context

The board implements the SRK2001 IC's proprietary adaptive control algorithm, which independently senses drain-source voltage (V_DS) on each SR MOSFET to determine optimal conduction windows-eliminating fixed timing delays and preventing shoot-through via hardware interlock logic between GD1 and GD2 outputs.

It supports operation across wide input voltage (4.5–32 V) and high-frequency LLC topologies (≤500 kHz), with dedicated ZCD_OFF comparator circuitry enabling sub-100 ns turn-off response during transient overloads or above-resonance excursions-critical for maintaining efficiency and thermal stability in high-density AC-DC adapters.

Key Specifications

Availability

STEVAL-ISA165V1 is available at Aetrix Electronics and suitable for LLC resonant converter development, high-efficiency AC-DC adapter qualification, and synchronous rectifier topology benchmarking requiring stable component supply and documented reference design validation.

Supply support for STEVAL-ISA165V1 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, delivering microcontrollers, power management ICs, analog devices, and evaluation platforms for industrial, automotive, and consumer applications.

The STEVAL series reflects ST's commitment to accelerating power electronics design-this board specifically targets engineers developing high-efficiency, digitally controllable LLC converters where adaptive synchronous rectification replaces diode losses with precise MOSFET timing.

FAQ

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

The SRK2001 implements adaptive synchronous rectification control for LLC resonant converters with center-tapped secondary windings. It independently monitors V_DS of two N-channel MOSFETs to dynamically trigger turn-on and turn-off, using interlocked gate drivers and a dedicated ZCD_OFF comparator to prevent shoot-through and enable fast turn-off during above-resonance operation.

Can STEVAL-ISA165V1 be used with non-ST MOSFETs?

Yes-the board's gate drive architecture supports standard N-channel MOSFETs with compatible V_GS thresholds and Q_g requirements. However, the STP120N4F6 (40 V, 4.3 mΩ, TO-220) is pre-installed and validated; substituting other devices requires verifying R_DS(on), gate charge, and thermal dissipation within the board's layout and heatsinking constraints.

Does this board support primary-side regulation integration?

No-STEVAL-ISA165V1 is strictly a secondary-side synchronous rectification demonstrator. It does not include primary-side controller interfaces, feedback compensation networks, or communication links to primary controllers. Its purpose is isolated validation of SRK2001 timing accuracy, gate drive strength, and ZCD_OFF responsiveness in LLC secondary stages.

Is there a recommended input voltage range for testing?

The board operates with VCC supplied from 4.5 V to 32 V, but functional testing as part of an LLC converter requires matching the secondary-side rectified voltage level. For typical 12 V or 24 V output LLC designs, the board is intended for use with transformer secondary voltages scaled accordingly-no onboard voltage conversion is provided.