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500 W fully digital AC-DC power supply (D-SMPS) based on STM32F334C8 microcontroller

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Parameter NameParameter Value
Operating RangeIndustrial
Target ApplicationAC-DC Topologies
Core ProductSTL160N3LLH6, STM32F051K8, STM32F334C8, STP13NM60ND, STP57N65M5, STPSC1006D, STTH1L06U
ECCN US3A991.a.2
Packing TypeNot Applicable
RoHs compliantEcopack2
Package NameCARD

The STEVAL-ISA147V3 is a digital switch mode AC-DC converter consisting of two power stages: an input semi-bridgeless power factor corrector (SBPFC) controlled by an STM32F051K8, and a regulation stage implemented with an LLC half bridge with synchronous rectification (SR), controlled by an STM32F334C8 microcontroller.

This 500 W AC-DC converter uses the so-called bridgeless PFC topology, with the advantage of lower conduction losses and higher efficiency by eliminating the need for a diode rectifier stage. This choice also allows a reduced component count compared to a standard PFC.

The input stage is typically controlled using an outer voltage loop for bus voltage regulation and an inner control loop to shape the current according to a sinusoidal waveform. The outer loop adjusts the current reference in order to maintain a regulated bus voltage, independent of load or input voltage variations. The output isolation and regulation stage is implemented using a half-bridge LLC topology, operating with constant duty cycle and variable frequency control.

Key features
  • Input AC voltage: 90 V to 264 V
  • Input AC frequency: 45 Hz to 65 Hz
  • Nominal power: 500 W
  • Output voltage: 12 V
  • Semi-Bridgeless PFC stage
  • DC-DC stage: resonant LLC with synchronous rectification
  • Peak efficiency: 94%
  • PFC switching frequency: 60 kHz
  • DC-DC switching frequency: 80 kHz to 115 kHz (burst mode above)
  • HF transformer isolation voltage: 4 kV
  • Cooling: natural convection up to 300 W, forced cooling above 300 W
  • PFC control: managed by STM32F051K8
  • LLC control: managed by STM32F334C8
  • Input short-circuit protection
  • Input under/overvoltage protection
  • Input under/overfrequency protection
  • DC Bus under/overvoltage protection
  • Output short-circuit protection
  • Output under/overvoltage protection
  • Overtemperature protection
  • RoHS compliant
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