STMicroelectronics STEVAL-ISA015V2

Overview

STEVAL-ISA015V2 from STMicroelectronics is a 3-phase industrial power supply evaluation board based on ESBT® technology, delivering 100 W output at 400 VAC ±20% input, operating at 50–85 kHz switching frequency with 90% efficiency, and designed for flyback topology in high-reliability 3-phase systems including motor inverters and UPS.

For engineers reviewing the STEVAL-ISA015V2 datasheet, STEVAL-ISA015V2 pinout, STEVAL-ISA015V2 application, or STEVAL-ISA015V2 equivalent, this board provides validated reference design data, safety-compliant (EN60950) layout, component-level BOM traceability, and schematic-level topology verification for industrial AC/DC conversion.

Technical Context

The board implements a discontinuous conduction mode (DCM) flyback converter using L6565 quasi-resonant controller and STC04IE170HV ESBT devices, enabling zero-voltage switching across wide input range. Input rectification uses dual 1N4007 diodes per phase and STTH108 fast recovery diodes on secondary side.

Feedback is implemented via TL431AC shunt regulator with optocoupler SFH617A-3 isolation, while ZCD (zero-current detection) and CS (current sense) pins of U1 interface directly to transformer auxiliary windings and current-sense resistor R15. Safety compliance includes reinforced insulation and creepage/clearance per EN60950.

Key Specifications

Availability

STEVAL-ISA015V2 is available at Aetrix Electronics and suitable for industrial motor drives, welding power supplies, and three-phase UPS systems requiring stable component supply, reference design validation, and safety-certified topology implementation.

Supply support for STEVAL-ISA015V2 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 devices, analog ICs, and evaluation platforms for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL series of application-specific evaluation kits, developed to accelerate adoption of proprietary power technologies-including ESBT®-in high-input-voltage industrial power conversion.

FAQ

What is the primary topology implemented on STEVAL-ISA015V2?

The board implements a quasi-resonant flyback converter using the L6565 controller and STC04IE170HV ESBT device. This topology was selected for its ability to deliver isolated 100 W output across a wide 400 VAC ±20% input range with high efficiency and minimal component count, meeting EN60950 safety requirements.

Does STEVAL-ISA015V2 support three-phase input directly?

Yes - the board accepts direct 3-phase 400 VAC line-to-line input via terminal block J1, with internal full-wave bridge rectification using discrete 1N4007 diodes per phase. No external rectifier module is required, and the design accommodates unbalanced or distorted industrial mains waveforms.

Can STEVAL-ISA015V2 generate multiple isolated outputs?

Yes - the flyback transformer T1 features four independent secondary windings (T1A–T1D), enabling up to four isolated DC outputs. Schematic shows +15 V, +24 V, and dual +35 V rails configured for gate driver bias, control logic, and auxiliary loads in 3-phase inverter systems.

Is STEVAL-ISA015V2 still in active production?

No - STMicroelectronics has marked STEVAL-ISA015V2 as obsolete (as noted in the November 2007 Data Brief revision history). It remains available through authorized distributors for legacy design support, but no new silicon revisions or technical updates are planned.