STEVAL-ISA147V3

STEVAL-ISA147V3 is a 500W fully digital AC-DC power supply (D-SMPS) based on STM32F334C8 MCU. This is a digital switch mode AC-DC converter consisting of two power stages: an input SBPFC controlled by an STM32F051K8, and a regulation stage implemented with an LLC half bridge with synchronous rectification (SR), controlled by an STM32F334C8 MCU. This 500W 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.

• Input AC voltage range from 90V to 264V
• Input AC frequency range from 45Hz to 65Hz and 60kHz PFC switching frequency
• 12V output voltage and 500W nominal power
• Semi-bridgeless PFC stage
• DC-DC stage: resonant LLC with synchronous rectification
• 94% peak efficiency and HF transformer isolation voltage is 4kV
• 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