STMicroelectronics EVLSTNRG011-150

Overview

EVLSTNRG011-150 from STMicroelectronics is a 12 V, 150 W AC/DC demonstration board based on the STNRG011 digital combo controller and SRK2001 synchronous rectifier IC, implementing a two-stage transition-mode PFC + resonant half-bridge LLC topology for high-efficiency power conversion from 90–264 V_AC mains. It delivers ±5% CV output regulation, >90% full-load efficiency at 115/230 V_AC, <75 mW no-load consumption, and >10 ms hold-up time - validated for ENERGY STAR® 6.1, EuP Lot 6 Tier 2, and CoC v5 Tier-2 compliance.

For engineers reviewing the EVLSTNRG011-150 datasheet, EVLSTNRG011-150 application, EVLSTNRG011-150 bill of materials, or EVLSTNRG011-150 evaluation board layout, this reference design provides a fully documented, production-ready topology for high-power AIO computers and universal adapters requiring programmable NVM configuration, black-box EEPROM operation, and Class-D harmonic compliance per EN61000-3-2 and JEITA-MITI.

Technical Context

The EVLSTNRG011-150 implements a digitally controlled two-stage architecture: a transition-mode (TM) PFC pre-regulator drives an LLC half-bridge resonant converter, with adaptive synchronous rectification managed by the SRK2001 controller. The STNRG011 integrates dual-loop digital control, programmable soft-start, and real-time protection algorithms including OVP, UVP, OCP, OTP, and brown-in/out detection.

Key system-level features include zero auxiliary supply requirement due to ultra-low standby consumption, configurable NVM-based parameter tuning (e.g., PFC gain, LLC frequency sweep, SR timing), and black-box operation enabled by factory-programmed EEPROM (M24C32). No external bias winding or auxiliary transformer is needed - startup is achieved via high-voltage current source integrated in STNRG011.

Key Specifications

Availability

EVLSTNRG011-150 is available at Aetrix Electronics and suitable for high-reliability AIO computer power supplies, universal 12 V adapter development, and energy-compliant LED driver reference designs requiring stable component supply and full regulatory validation.

Supply support for EVLSTNRG011-150 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 devices, and digital controllers for industrial, automotive, and consumer applications.

The EVLSTNRG011-150 belongs to ST's digital power evaluation platform family, engineered to accelerate adoption of digitally controlled AC/DC topologies - specifically targeting high-efficiency, low-standby, and standards-compliant power supplies for computing and lighting.

FAQ

What is the primary function of the STNRG011 IC on this board?

The STNRG011 is a digital combo controller that manages both the transition-mode PFC stage and the resonant half-bridge LLC converter in a single SO-20 package. It executes real-time digital control loops, implements programmable protections (OVP/UVP/OCP/OTP), and enables full NVM-based configuration - eliminating external compensation components and enabling black-box operation via EEPROM.

Does the EVLSTNRG011-150 require an auxiliary power supply for startup or bias?

No. The board achieves zero-auxiliary-supply operation: the STNRG011 integrates a high-voltage startup current source that powers internal circuitry directly from the rectified AC input. This reduces BOM count, improves reliability, and contributes to the sub-75 mW no-load consumption required by EuP Lot 6.

How is synchronous rectification implemented, and what IC controls it?

Synchronous rectification is implemented on the LLC secondary side using two STL140N6F7 Power MOSFETs (PoweFLAT 5x6) driven by the SRK2001 adaptive controller (SSOP10). The SRK2001 senses drain-source voltage and dynamically adjusts gate timing to minimize conduction loss while avoiding shoot-through - increasing efficiency beyond what's achievable with Schottky diodes.

Can the EVLSTNRG011-150 be modified for different output voltages or power levels?

Yes - the board supports reconfiguration via its M24C32 EEPROM and ST's eDesignSuite software. Output voltage can be adjusted by modifying feedback resistor dividers and updating digital control parameters (e.g., reference DAC code, PID gains); power level scaling requires transformer and MOSFET derating analysis but leverages the same STNRG011/SRK2001 control architecture.