STMicroelectronics STEVAL-ISA170V1

Overview

STEVAL-ISA170V1 from STMicroelectronics is a 150 W, 12 V resonant AC-DC converter evaluation board implementing a two-stage architecture: an L6563H-based PFC pre-regulator followed by an L6699-controlled LLC half-bridge resonant converter with SRK2001 synchronous rectification. It delivers >91% average efficiency per ENERGY STAR® 6.1, <0.15 W no-load consumption at 230 Vac, and meets EN55022 Class-B EMI and EN60950 safety standards.

For engineers reviewing the STEVAL-ISA170V1 datasheet, STEVAL-ISA170V1 application notes, STEVAL-ISA170V1 schematic, or STEVAL-ISA170V1 alternative evaluation boards, this reference design supports rapid validation of high-efficiency, low-noise, regulatory-compliant power supplies for AIO computers and high-power adapters - with emphasis on light-load behavior, adaptive dead-time control, and synchronous rectification optimization.

Technical Context

The board implements a front-end boost PFC stage using the L6563H controller operating in transition mode (TM), enabling universal input (90–264 Vac) and compliance with EuP Lot 6 Tier 2. The downstream LLC resonant half-bridge uses the L6699 controller featuring self-adjusting adaptive dead-time, anti-capacitive mode protection, and a proprietary "safe-start" sequence to prevent hard switching at startup.

Synchronous rectification is managed by the SRK2001 controller, which dynamically adjusts gate drive timing across load conditions to maximize conduction efficiency and minimize body-diode conduction loss in the secondary-side MOSFETs - critical for sustaining >91% average efficiency and sub-0.15 W no-load input power.

Key Specifications

Availability

STEVAL-ISA170V1 is available at Aetrix Electronics and suitable for AIO computer power supply validation, high-power AC-DC adapter development, and LLC resonant converter topology benchmarking requiring stable component supply and documented reference performance.

Supply support for STEVAL-ISA170V1 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, designing and manufacturing microcontrollers, power ICs, analog devices, and silicon solutions for industrial, automotive, and consumer applications.

This evaluation board belongs to ST's STEVAL (ST Evaluation) series - purpose-built reference designs that demonstrate validated, application-ready implementations of ST's power controller chipsets for high-efficiency AC-DC conversion.

FAQ

Is STEVAL-ISA170V1 RoHS compliant?

Yes. The board is fully RoHS compliant, using lead-free solder and conforming to Directive 2011/65/EU. All components, including the L6563H, L6699, and SRK2001 controllers, meet RoHS material restrictions as confirmed in ST's official documentation and the board's April 2015 data brief (DocID027701 Rev 1).

Can STEVAL-ISA170V1 be modified for 24 V output?

No. The board is fixed at 12 V output via its transformer turns ratio, secondary rectifier layout, and SRK2001 configuration. Output voltage change would require redesign of the LLC transformer, feedback divider, synchronous rectifier gate drive network, and revalidation of dead-time and ZVS behavior - not supported by the existing PCB or firmware.

Does STEVAL-ISA170V1 include PFC and LLC control in a single IC?

No. It uses three discrete ST controllers: L6563H for TM-PFC, L6699 for LLC resonant half-bridge control, and SRK2001 for adaptive synchronous rectification. This multi-chip architecture enables independent optimization of each stage - unlike integrated single-die solutions - and is explicitly documented in the schematic and data brief.

What safety certifications does STEVAL-ISA170V1 meet?

The board complies with EN60950-1 for information technology equipment safety and EN55022 Class-B for conducted/radiated emissions. It is not a certified end-product but a reference design validated to these standards - meaning its layout, component selection, and isolation barriers meet required creepage/clearance, insulation, and EMI filtering criteria per those specifications.