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STMicroelectronics STEVAL-ISA125V1

Name: STEVAL-ISA125V1
Brand: STMicroelectronics
SKU: STEVAL-ISA125V1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STEVAL-ISA125V1

Manufacturer:: STMicroelectronics

Category:: DC/DC & AC/DC (Off-Line) SMPS Evaluation Boards

Package:

Datasheet:: STEVAL-ISA125V1.pdf

Description:: EVAL BOARD FOR VIPER28

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,409

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Product details

Overview

STEVAL-ISA125V1 from STMicroelectronics is a 5 V / 10 W, 60 kHz isolated flyback evaluation board based on the VIPer28LN high-voltage offline converter IC. It delivers up to 2 A continuous and 3 A peak (1.9 s) output, features adjustable overvoltage protection, thermal shutdown with hysteresis, and <50 mW standby power at 265 V_AC, targeting auxiliary power supplies in printers and audio amplifiers.

For engineers reviewing the STEVAL-ISA125V1 datasheet, STEVAL-ISA125V1 pinout, STEVAL-ISA125V1 application, or STEVAL-ISA125V1 equivalent, this board enables rapid validation of VIPer28LN's EPT (Extended Peak Time) function for short-duration overload handling, EMI-reduced jittered PWM operation, and integrated safety protections in compact AC/DC designs.

Technical Context

The board implements an isolated flyback topology using the VIPer28LN's integrated 800 V avalanche-rugged power section and internal current-mode PWM controller operating at 60 kHz with frequency jittering. It supports universal AC input (90–265 V_RMS) and regulates output voltage within ±5% under low-frequency load transients.

EPT functionality allows configurable peak-current duration (up to 1.9 s at 3 A), after which safe auto-restart engages. Protection includes adjustable overvoltage lockout, delayed overload response, and thermal shutdown with hysteresis-enabling robust operation without external supervision circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	90–265 V_RMS: supports global mains without manual selection or external range-switching circuitry.
Output Voltage	5 V ±5%: tightly regulated low-noise rail suitable for powering logic, sensors, or gate drivers.
Continuous Output Current	2 A: sustains 10 W load continuously at full input range and 60 °C ambient.
Peak Output Current	3 A for 1.9 s: enables brief high-power bursts (e.g., printer motor startup) without thermal derating.
Switching Frequency	60 kHz with jitter: reduces conducted and radiated EMI peaks while maintaining transformer size efficiency.
Standby Power	<50 mW at 265 V_AC: meets stringent no-load energy consumption requirements for Class VI efficiency standards.
Protections	Adjustable OVP, thermal shutdown with hysteresis, delayed overload, and auto-restart: eliminates need for discrete protection ICs or complex monitoring.

Availability

STEVAL-ISA125V1 is available at Aetrix Electronics and suitable for printer power supplies, audio amplifier auxiliary rails, industrial control auxiliary converters, and IoT gateway AC/DC front-ends requiring stable component supply and fast design validation.

Supply support for STEVAL-ISA125V1 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 chips, and MEMS sensors for industrial, automotive, and consumer applications.

This board belongs to ST's STEVAL (ST Evaluation) series-engineered to accelerate prototyping and qualification of ST's proprietary power conversion ICs like VIPer, L65xx, and HVLED drivers in real-world AC/DC and DC/DC topologies.

FAQ

What is the primary purpose of the STEVAL-ISA125V1 evaluation board?

The STEVAL-ISA125V1 is a fully assembled, tested demonstration board for the VIPer28LN offline flyback controller. Its purpose is to validate the IC's Extended Peak Time (EPT) capability, jittered 60 kHz PWM operation, and integrated protection features-including adjustable overvoltage lockout and thermal shutdown-in a production-ready 5 V / 10 W isolated power supply design.

Does the board support universal AC input and what are its efficiency characteristics?

Yes, it accepts 90–265 V_RMS AC input without modification. At full load and nominal line, typical efficiency exceeds 78%. Standby power is <50 mW at 265 V_AC, meeting DOE Level VI and EU CoC Tier 2 requirements. Efficiency is maintained across line and load via VIPer28LN's adaptive bias and valley-switching behavior.

Can the peak current duration be modified, and how is EPT configured?

Yes-EPT duration (up to 1.9 s at 3 A) is set by an external RC network on the VIPer28LN's EPT pin. The board includes solder jumpers and footprint options to adjust timing components. Configuration does not require firmware; it is purely analog, enabling deterministic peak-handling behavior without MCU intervention.

Is isolation certified, and what safety standards does it meet?

The board provides reinforced isolation between primary and secondary sides, with creepage/clearance compliant to IEC 60950-1 and IEC 62368-1. It achieves 4 kV_AC dielectric strength (1 min) and meets EN 55032 Class B conducted/radiated EMI limits when used with recommended layout and filtering-verified per ST's reference design documentation.

STEVAL-ISA125V1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: VIPER™

Packaging:: Box

Product Status:: Active

Main Purpose:: AC/DC, Primary Side

Outputs and Type:: 1 Isolated Output

Voltage - Output:: 10 W

Current - Output:: 5V

Voltage - Input:: 2A

Regulator Topology:: 90 ~ 265 VAC

Frequency - Switching:: Flyback

Contents:: 60kHz

Utilized IC / Part:: Board(s)

Power - Output:: VIPer28

STEVAL-ISA125V1 FAQ

1.How can I place an order for STEVAL-ISA125V1 through Aetrix?

Please submit a Request for Quotation (RFQ) for STEVAL-ISA125V1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STEVAL-ISA125V1 reliable?

The price and inventory of STEVAL-ISA125V1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STEVAL-ISA125V1 is usually 5 days.

3.What payment methods are accepted for STEVAL-ISA125V1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STEVAL-ISA125V1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STEVAL-ISA125V1?

STEVAL-ISA125V1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STEVAL-ISA125V1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STEVAL-ISA125V1?

For technical support, including STEVAL-ISA125V1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STEVAL-ISA125V1 requirements.

6.How does Aetrix verify that STEVAL-ISA125V1 is sourced from the original manufacturer or authorized distributors?

All STEVAL-ISA125V1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STEVAL-ISA125V1 meets industry standards.

7.What is the process for return or replacement of STEVAL-ISA125V1?

All STEVAL-ISA125V1 units undergo pre-shipment inspection (PSI). If there is an issue with STEVAL-ISA125V1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STEVAL-ISA125V1 part is unused and in its original packaging.

Return procedure for STEVAL-ISA125V1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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