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Home > Products > Development Boards, Kits, Programmers > Evaluation Boards > DC/DC & AC/DC (Off-Line) SMPS Evaluation Boards

STMicroelectronics EVLVIPER28L-10W

Name: EVLVIPER28L-10W
Brand: STMicroelectronics
SKU: EVLVIPER28L-10W
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: EVLVIPER28L-10W

Manufacturer:: STMicroelectronics

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

Package:

Datasheet:: EVLVIPER28L-10W.pdf

Description:: EVAL BOARD FOR VIPER28

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,979

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Product details

Overview

EVLVIPER28L-10W from STMicroelectronics is a 5 V/10 W isolated flyback demonstration board based on the VIPER28LN offline high-voltage controller IC, implementing peak power management via EPT (Extra Power Time) function, delivering up to 3.3 A for 1.9 s under regulation, and operating at 60 kHz with frequency jittering for EMI reduction.

For engineers reviewing the EVLVIPER28L-10W datasheet, EVLVIPER28L-10W pinout, EVLVIPER28L-10W application, or EVLVIPER28L-10W equivalent, this board serves as a validated reference design for cost-optimized AC-DC adapters requiring short-term overload capability in printers, audio amplifiers, and industrial auxiliary supplies.

Technical Context

The board implements a primary-side regulated flyback topology using VIPER28LN, which integrates an 800 V avalanche-rugged MOSFET, PWM controller, and HV start-up circuitry. It operates in continuous conduction mode (CCM) across input range (90–265 V_AC) and full load, reducing RMS current stress on primary switch and secondary rectifier.

Regulation is achieved via optocoupler-isolated feedback (PC817 + TS431), with compensation network (C6/C7/R12) stabilizing loop response. The EPT function enables programmable overload duration (1.9 s at 3.3 A), after which auto-restart protection engages-distinct from standard OCP or thermal shutdown.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	5 V ±5% line/load regulation, maintained during 3.3 A peak for 1.9 s
Max continuous output power	10 W at 2 A, enabling thermally optimized PCB layout without oversized magnetics
Peak output current	3.3 A for ≤1.9 s, supported by EPT timing control and internal current limiting
Switching frequency	60 kHz with frequency jittering, reducing conducted EMI peaks by spreading spectrum
Input voltage range	90–265 V_AC, compliant with universal mains input for global deployment
Standby power	<50 mW at 265 V_AC, meeting Energy Star® no-load consumption criteria
Transformer isolation	4 kV _RMS primary-to-secondary, satisfying reinforced insulation requirements

Availability

EVLVIPER28L-10W is available at Aetrix Electronics and suitable for printer power supplies, audio system auxiliary rails, industrial IoT gateway adapters, and medical device standby converters requiring stable component supply and pre-validated safety compliance.

Supply support for EVLVIPER28L-10W 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 analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer applications.

This evaluation board belongs to ST's VIPer™ offline SMPS controller product line, engineered specifically for compact, low-BOM-cost AC-DC converters targeting sub-25 W applications with integrated protection and energy efficiency.

FAQ

What is the purpose of the EPT function on EVLVIPER28L-10W?

The EPT (Extra Power Time) function allows the board to sustain 3.3 A output current for up to 1.9 seconds while maintaining 5 V regulation-enabling cost-effective thermal design for intermittent peak loads like printer motor startup or audio amplifier transient bursts without oversizing components.

Does EVLVIPER28L-10W support primary-side regulation without optocoupler?

No. This board uses optocoupler-based secondary-side regulation (PC817 + TS431) for precise 5 V output control and reinforced isolation. The VIPER28LN IC itself does not implement primary-side regulation; it requires external feedback via FB pin for tight voltage accuracy.

Can the output voltage be adjusted to 3.3 V or 12 V?

Yes-output voltage is set by the TS431 reference and optocoupler feedback divider (R9/R10). Replacing R9 (27 kΩ) and R10 (560 kΩ) with appropriate values recalibrates regulation to 3.3 V or 12 V, provided transformer turns ratio and rectifier ratings remain compatible.

What safety certifications does EVLVIPER28L-10W meet?

The board implements 4 kV_RMS transformer isolation, reinforced creepage/clearance per IEC 60950-1, and meets EN 55032 Class B conducted EMI limits. It serves as a pre-tested platform for end-product certification but requires full system-level validation for UL/IEC 62368-1 compliance.

EVLVIPER28L-10W Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: VIPER™

Packaging:: Box

Product Status:: Obsolete

Main Purpose:: AC/DC, Primary Side

Outputs and Type:: 1 Isolated Output

Voltage - Output:: 12 W

Current - Output:: 5V

Voltage - Input:: 2.4A

Regulator Topology:: 85 ~ 265 VAC

Frequency - Switching:: Flyback

Contents:: 60kHz

Utilized IC / Part:: Board(s)

Power - Output:: VIPer28

EVLVIPER28L-10W FAQ

1.How can I place an order for EVLVIPER28L-10W through Aetrix?

Please submit a Request for Quotation (RFQ) for EVLVIPER28L-10W 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 EVLVIPER28L-10W reliable?

The price and inventory of EVLVIPER28L-10W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EVLVIPER28L-10W is usually 5 days.

3.What payment methods are accepted for EVLVIPER28L-10W?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EVLVIPER28L-10W transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for EVLVIPER28L-10W?

EVLVIPER28L-10W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your EVLVIPER28L-10W 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 EVLVIPER28L-10W?

For technical support, including EVLVIPER28L-10W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EVLVIPER28L-10W requirements.

6.How does Aetrix verify that EVLVIPER28L-10W is sourced from the original manufacturer or authorized distributors?

All EVLVIPER28L-10W 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 EVLVIPER28L-10W meets industry standards.

7.What is the process for return or replacement of EVLVIPER28L-10W?

All EVLVIPER28L-10W units undergo pre-shipment inspection (PSI). If there is an issue with EVLVIPER28L-10W, 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 EVLVIPER28L-10W part is unused and in its original packaging.

Return procedure for EVLVIPER28L-10W:

1.Submit a request within 90 days.

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

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