STMicroelectronics STEVAL-ISA181V1

Overview

STEVAL-ISA181V1 from STMicroelectronics is an evaluation board for the VIPer0P zero-power off-line high-voltage converter IC, implementing a flyback SMPS with integrated 800 V avalanche-rugged MOSFET, current-mode PWM control, and smart zero-power mode (ZPM) management. It delivers up to 12 W at 230 VAC in open-frame configuration, supports self-supply operation (no auxiliary winding required), achieves <4 mW no-load input power at 230 VAC, and features jittered 60 kHz or 120 kHz switching to reduce EMI filter cost.

For engineers reviewing the STEVAL-ISA181V1 datasheet, STEVAL-ISA181V1 pinout, STEVAL-ISA181V1 application, or STEVAL-ISA181V1 equivalent, this board enables rapid validation of VIPer0P-based ultra-low-power AC/DC converters for home appliance standby supplies, industrial IoT sensors, and lighting control systems requiring ZPM entry/exit via MCU GPIO.

Technical Context

The STEVAL-ISA181V1 implements a non-isolated flyback topology using the VIPer0P SO16N IC, which integrates an 800 V MOSFET, HV startup current source (ICH3 = 7.8 mA typ.), error amplifier with 1.2 V reference, and jittered oscillator (±7% modulation depth at 260 Hz). The board supports both external bias and self-supply modes, eliminating auxiliary windings.

ZPM is managed via dedicated ON/OFF pins with debounce timing (tDEB_OFF = 16 ms, tDEB_ON = 35 µs), enabling MCU-controlled deep-sleep states. Protection includes drain current limit (IDLIM = 400 mA), thermal shutdown (TSD = 150 °C), OLP with 50 ms delay, and pulse-skip to prevent flux runaway during startup or short-circuit conditions.

Key Specifications

Availability

STEVAL-ISA181V1 is available at Aetrix Electronics and suitable for home appliance standby power, industrial sensor node power, and smart lighting control applications requiring stable component supply, fast design iteration, and regulatory-compliant low-power validation.

Supply support for STEVAL-ISA181V1 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 chips, and MEMS sensors for industrial, automotive, and consumer markets.

The VIPer product line delivers highly integrated off-line AC/DC converters targeting ultra-low-power, space-constrained applications such as smart home devices and industrial controls where ZPM, self-supply, and EMI reduction are critical design requirements.

FAQ

What is the primary purpose of the STEVAL-ISA181V1 evaluation board?

The STEVAL-ISA181V1 is a fully assembled and tested demonstration board for the VIPer0P IC, designed to accelerate development of ultra-low-power offline SMPS. It validates ZPM operation, self-supply capability, jittered-frequency EMI reduction, and MCU-managed standby/active transitions - all in a single-board reference implementation compliant with IEC 62368-1 and EN 55032 Class B.

Can the STEVAL-ISA181V1 be used to generate negative output voltages?

Yes. The VIPer0P IC on this board integrates an error amplifier with separate EAGND reference, enabling direct negative-output flyback configurations. In such designs, EAGND connects to the negative rail while FB senses the negative output via a voltage divider - eliminating optocouplers and secondary-side regulation components for simple, low-cost isolated or non-isolated negative supplies.

How does the board implement zero-power mode (ZPM) without external components?

ZPM is implemented using the VIPer0P's dedicated ON/OFF pins and internal logic: pulling OFF to SGND for ≥16 ms enters ZPM, where quiescent current drops to 20 µA; pulling ON to SGND for ≥35 µs exits ZPM. The board provides test points and GPIO headers for MCU connection - no external FETs, level shifters, or debouncing RC networks are needed.

Does the STEVAL-ISA181V1 support both VIPER0PL and VIPER0PH variants?

Yes. The board is compatible with both VIPer0P variants: VIPER0PL (60 kHz ±7%) and VIPER0PH (120 kHz ±7%). The oscillator frequency is determined by the installed VIPer0P IC; no board-level modifications or resistor changes are required to switch between types - enabling direct comparison of EMI performance and transformer size trade-offs.