STMicroelectronics STEVAL-ISA183V1

Overview

STEVAL-ISA183V1 from STMicroelectronics is an evaluation board implementing a 16 W triple-output quasi-resonant flyback converter using the VIPer35LD high-voltage controller, designed as an auxiliary power supply for air conditioning systems. It delivers isolated 12 V/1 A and non-isolated 15 V/200 mA and 5 V/200 mA outputs, achieves >81% full-load efficiency, consumes <50 mW at no-load, and meets EN55022 Class-B EMI with low-cost filtering.

For engineers reviewing the STEVAL-ISA183V1 datasheet, STEVAL-ISA183V1 schematic, STEVAL-ISA183V1 application notes, or STEVAL-ISA183V1 bill of materials, this board serves as a validated reference design for compact, low-noise, multi-rail auxiliary PSUs in HVAC control units requiring robust AC input tolerance (175–275 VAC) and ultra-low standby power.

Technical Context

The board implements a quasi-resonant flyback topology centered on the VIPer35LD - an integrated 800 V MOSFET + current-mode QR PWM controller - enabling zero-voltage switching across line and load variations. Feedback is provided via optocoupler (SFH6106-2T) for the isolated 12 V rail and TL432-based shunt regulator for the 5 V/15 V rails.

Secondary regulation uses LDK320AM50 (5 V LDO) and TS432ILT (adjustable shunt reference) to stabilize non-isolated outputs. Input stage includes NTC thermistor, bridge rectifier (DBLS105G), and bulk capacitor (940 µF total); EMI filtering relies on a single-stage LC network meeting Class-B without common-mode chokes.

Key Specifications

Availability

STEVAL-ISA183V1 is available at Aetrix Electronics and suitable for HVAC control units, embedded climate system supervisors, and industrial air handling unit (AHU) auxiliary power designs requiring stable component supply, rapid prototyping validation, and production-ready reference schematics.

Supply support for STEVAL-ISA183V1 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, sensors, and analog products for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series - purpose-built reference designs that demonstrate application-specific implementations of ST's power, interface, and control ICs, targeting fast engineering validation in HVAC, appliance, and industrial power subsystems.

FAQ

What is the primary function of the STEVAL-ISA183V1 evaluation board?

The STEVAL-ISA183V1 is a fully assembled, tested reference design for a 16 W triple-output auxiliary power supply. Its core function is to provide isolated 12 V/1 A and non-isolated 15 V/200 mA and 5 V/200 mA rails from universal AC input (175–275 VAC), specifically optimized for use in air conditioning system control boards where space, efficiency, and low standby consumption are critical.

Which ST IC serves as the main controller on this board?

The VIPer35LD is the primary controller IC - a high-voltage quasi-resonant PWM controller integrating an 800 V avalanche-rated power MOSFET, current-sense circuitry, and protection features including thermal shutdown, overcurrent, and overvoltage lockout. It drives the main flyback transformer and regulates the isolated 12 V output via optocoupler feedback.

Can the STEVAL-ISA183V1 be used outside air conditioning applications?

Yes - while optimized for HVAC auxiliary power, its triple-output architecture, wide AC input range, and ultra-low no-load consumption make it suitable for other industrial control panels, building automation gateways, and smart appliance sub-power supplies where reinforced isolation on one rail and cost-effective EMI compliance are required.

Does the board include safety certifications or test reports?

The STEVAL-ISA183V1 itself is not a certified end-product, but its design complies with EN55022 Class-B EMI limits and incorporates reinforced isolation on the 12 V output per IEC 60747-5-5. ST provides full schematic, BOM, layout files, and test data (efficiency curves, no-load plots, CE measurements) in DocID030510 for customer safety certification reuse.