STMicroelectronics EVALVIPER17L-7W

Overview

EVALVIPER17L-7W from STMicroelectronics is a demonstration board implementing an isolated 12 V / 600 mA flyback converter using the VIPer17 (60 kHz, DIP-7) integrated high-voltage PWM controller + 800 V avalanche-rugged MOSFET. It delivers up to 7 W across 90–265 V_RMS input, features frequency jittering, <±5% output regulation, 50 mV HF ripple, and comprehensive protection including overload, short-circuit, transformer saturation, brown-out (optional), and over-voltage (optional).

For engineers reviewing the EVALVIPER17L-7W datasheet, EVALVIPER17L-7W pinout, EVALVIPER17L-7W application, or EVALVIPER17L-7W equivalent, this board serves as a validated reference design for low-power offline AC/DC conversion in industrial power supplies, smart home adapters, and IoT wall-wart applications requiring EMI compliance and ultra-low standby consumption.

Technical Context

The board implements a fixed-frequency (60 kHz), current-mode flyback topology with primary-side regulation via optocoupler feedback (PC817) and TL431 shunt reference. Input rectification uses DF06M bridge; filtering includes X2 capacitor (C1), common-mode choke (T2), and bulk electrolytics (C2/C3). The VIPer17 integrates gate driver, oscillator, and protection logic - eliminating external PWM IC and high-voltage MOSFET.

Protection functions are hardware-embedded: cycle-by-cycle current limiting sets drain current threshold; secondary OCP detects winding shorts; thermal shutdown activates at internal junction temperature; brown-out and over-voltage protections are implemented via external resistor dividers (R2/R4, R3) and optional components (C5, VR1 configuration). No-load standby consumption is minimized by burst-mode operation.

Key Specifications

Availability

EVALVIPER17L-7W is available at Aetrix Electronics and suitable for industrial power supplies, smart home AC/DC adapters, and IoT edge node power conversion requiring stable component supply, rapid prototyping validation, and regulatory-compliant reference implementation.

Supply support for EVALVIPER17L-7W 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 devices for industrial, automotive, and consumer markets.

This evaluation board belongs to ST's VIPer™ AC/DC converter product line, engineered to simplify offline SMPS design by integrating control logic and high-voltage power switching into single-package solutions for sub-15 W applications.

FAQ

What is the maximum output power achievable with EVALVIPER17L-7W under European mains voltage?

At 175–265 V_RMS input, the board delivers up to 10 W output power while maintaining safety margins and thermal stability. This higher capability leverages the VIPer17's optimized efficiency curve in high-line conditions and is verified per ST's application note AN2711. The 7 W rating applies to full universal input range (90–265 V_RMS).

Can brown-out protection be disabled, and how does it affect board operation?

Yes - brown-out protection is optional and disabled by omitting R2/R4 resistors and associated circuitry. Without it, the board starts immediately upon reaching minimum operating voltage (~50 V_AC) but loses immunity to brown-out events that could cause erratic restarts or output instability during grid sags.

Which protection mechanisms are implemented internally in the VIPer17 versus externally on the board?

VIPer17 integrates cycle-by-cycle current limiting, thermal shutdown, and soft-start. External protections include output over-voltage (via TL431 + optocoupler), secondary winding short detection (R14 sensing), and brown-out (resistor divider). Transformer saturation protection uses primary current waveform analysis within the IC's internal comparator.

Is EVALVIPER17L-7W RoHS-compliant and lead-free?

Yes - all components listed in the Bill of Materials (Table 2) comply with RoHS Directive 2011/65/EU. STMicroelectronics confirms the VIPer17 IC and supporting passives (e.g., C2/C3 450YXA10M, D4 STPS2H100) are lead-free and halogen-free, meeting JEDEC J-STD-020 moisture sensitivity level 3 requirements.