Ac-dc power converter controller includes high-voltage start-up generator

The STMicroelectronics STNRG012 controller provides a high level of integration, combining a PFC stage controller and an LLC resonant half-bridge controller with the 800 V start-up circuit.

The STNRG012 from STMicroelectronics combines a PFC controller, a high-voltage LLC resonant half-bridge controller, an 800 V-rated start-up generator and a sophisticated digital engine that manages the operation of the three power stages. 


Supplied in a 20-pin SO package with a footprint of 13.0 mm x 7.6 mm, the STNRG012 offers an excellent solution for high-efficiency PFC converters that have to comply with stringent energy-saving regulations. 


The PFC controller supports both transition mode and discontinuous conduction mode. It can operate from either a mains ac or a dc line input.  


The power system and the control algorithms are managed by an 8-bit core with dedicated fast peripherals, and the chip benefits from high-performance digital algorithms and analog IP. Application parameters can be stored in non-volatile memory in production, giving engineers considerable ability to configure and calibrate their system.  


A UART interface enables system monitoring, storage of black-box data in external Flash, and uploading software updates from external Flash. 


  • Time-shift control of resonant half-bridge 
  • PFC brown-out protection 
  • Half-bridge protection functions: 
    • Overload protection
    • Soft-start time-out 
    • Over-voltage protection 
  • 8-channel, 10-bit ADC 


  • Street lighting 
  • Residential lighting 
  • Industrial equipment 

Evaluation Board

Part supported: STNRG012 

Board part number: EVL012LED  

The EVL012LED is an LED driver board. The architecture is based on a two-stage approach: a front-end PFC pre-regulator and a downstream resonant half-bridge converter, using the new STNRG012 IC that integrates the controllers of both sections in a single device.  


The main features of this design are high efficiency, low power consumption at no load without an auxiliary supply, good power factor with low harmonic content, and reduced component count.  


The board also has a full set of protection features including output overload, short-circuit, and over-voltage, all of which can be easily defined as latched or auto-restart by changing a value in the non-volatile memory of the controller. 


Key features:  


  • Input-voltage range: 90 V to 277 V ac  
  • Output-voltage range: 36 V to 56 V dc 
  • 200 W maximum output power 
  • 3.6 A maximum constant output current  
  • Less than 0.5 W no-load power consumption 
  • Higher than 93% efficiency at full load 
  • Conducted EMC within EN 55022 Class B limits 
  • Safety performance complies with EN 60950 
  • Analog dimming from 100% to less than 10% with 
    100 kΩ potentiometer or 0-10V  control signal 

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