STMicroelectronics EVLVIP27H-12SB

Overview

EVLVIP27H-12SB from STMicroelectronics is a demonstration board implementing a 5 V / 11 W flyback auxiliary power supply using the VIPer27HN offline switching regulator IC. It operates across universal AC input (90–265 V_RMS), delivers up to 2.2 A output current, achieves ≤50 mV high-frequency output ripple, and supports burst-mode operation for <100 mW no-load input power - designed specifically for standby power in LCD/Plasma TVs and desktop computers.

For engineers reviewing the EVLVIP27H-12SB datasheet, EVLVIP27H-12SB pinout, EVLVIP27H-12SB application, or EVLVIP27H-12SB equivalent, this page provides verified electrical specifications, measured efficiency vs. load and line voltage, burst-mode behavior, protection features (OVP, brown-out, short-circuit), transformer characteristics, and BOM-level component validation per AN3011 Rev 1.

Technical Context

This board implements a two-output flyback converter: one regulated 5 V output (2.2 A max) and one unregulated auxiliary VDD rail (~21 V at full load). The VIPer27HN integrates a 700 V avalanche-rated power MOSFET and PWM controller operating at 115 kHz, enabling continuous conduction mode (CCM) at low-line full-load to reduce RMS currents and thermal stress on primary-side components.

Protection functions are hardware-implemented: output overvoltage protection triggers at 6.8 V (±5 %), brown-out is configurable via J7 jumper (enabling/disabling ~65 V_AC shutdown), and secondary winding short-circuit protection forces automatic restart after fault clearance. The LC filter reduces high-frequency output ripple from ~150 mV (pre-filter) to ≤20 mV (post-filter) under full load.

Key Specifications

Availability

EVLVIP27H-12SB is available at Aetrix Electronics and suitable for LCD/Plasma TV auxiliary supplies, desktop PC standby power, and USB-powered peripheral keep-alive circuits requiring stable component supply, validated reference designs, and regulatory-compliant low-power operation.

Supply support for EVLVIP27H-12SB 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, specializing in power management, microcontrollers, and analog/mixed-signal ICs for industrial, automotive, and consumer applications.

EVLVIP27H-12SB belongs to ST's VIPer™ evaluation board family, engineered to accelerate development of energy-efficient auxiliary power supplies meeting international efficiency standards (ENERGY STAR®, CoC Tier 2) and safety requirements (4 kV isolation, reinforced insulation).

FAQ

What is the purpose of the J7 jumper on EVLVIP27H-12SB?

The J7 jumper configures brown-out protection: when installed, the board shuts down if AC input drops below ~65 V_AC; when removed, brown-out detection is disabled. This allows evaluation of light-load stability under marginal line conditions per Table 12–17 test data, where brown-out state directly impacts no-load and 30–200 mW performance.

How does the board achieve <100 mW no-load input power?

It uses VIPer27HN's burst-mode operation: the controller stops switching during light/no-load, reducing average power draw. Measured no-load input power is 94.8 mW at 230 V_AC (Table 10), enabled by low-quiescent-current biasing, optimized transformer leakage inductance (<25 µH), and minimal feedback loop consumption - all validated in Section 3.1.1.

Can EVLVIP27H-12SB be modified for 12 V output?

No - the board is fixed for 5 V output via resistor divider R14/R15 (39 kΩ / 3.3 MΩ) setting the TS431 reference feedback point. Changing output voltage requires redesigning the feedback network, transformer turns ratio (primary-to-secondary 14.75:1), and output rectifier/capacitor ratings; ST does not provide 12 V variant documentation for this board.

What transformer is used, and is it replaceable?

The board uses Würth Elektronik WE-750871012 (PN 750871012): 900 µH primary inductance, 14.75:1 primary-to-secondary turns ratio, 4 kV isolation. It is socketed and replaceable; Table 3 specifies tolerance (±1 % turns ratio), leakage inductance (≤25 µH), and insulation - critical for maintaining CCM operation and safety compliance.