STEVAL-ISA172V2 STMicroelectronics

S T E VA L - I S A 1 7 2 V 2 2 kW fully digital AC-DC power supply (D-SMPS) evaluation board Data brief Synchronous rectification based on STripFET Power MOSFETs Active clamp circuit based on MDmesh DM2 Power MOSFETs EMC filter for noise reduction RoHS compliant Description The STEVAL-ISA172V2 is a 2 kW fully digital switch mode AC-DC converter consisting of two power sections: a two phase interleaved power factor corrector (PFC) and a DC-DC phase- shifted full-bridge converter, controlled by a STM32F334 microcontroller for each section. Features The interleaved PFC comprises two boost Input AC voltage: 90 V to 264 V converters operating with 180 out of phase, based on 600 V MDmesh M2 Power MOSFETs. Output voltage: 48 V or 52 V, Max output The downstream section comprises of a DC-DC current: 42 A phase-shifted full-bridge converter based on Input AC frequency: 45 Hz to 65 Hz MDmesh DM2 Power MOSFETs and performing Nominal output power: 2 kW voltage step down using HF transformer, with a Interleaved PFC stage primary to secondary ratio chosen to maintain PFC switching frequency: 60 kHz high enough efficiency and regulation over the PFC Average current mode control entire operating range. Cycle by cycle PFC current control Maximum power factor: 0.99 On the primary side the transformer is supplied DC-DC stage: full-bridge phase-shifted ZVS by the full-bridge converter and switching losses are reduced thanks to zero voltage switching with synchronous rectification (ZVS) operation. DC-DC switching frequency: 100 kHz Overall efficiency: 80 PLUS Platinum level On the secondary side synchronous rectification HF transformer isolation voltage: 4 kV (SR) is used to ensure low conduction losses. Forced cooling with air flow speed The output voltage waveform is rectified by modulation according to the output power STripFET Power MOSFETs and then smoothed Over-temperature protection by the output filter. Output short-circuit protection PFC control & DC-DC control: managed by STM32F334C8 PFC power stage based on MDmesh M2 Power MOSFETs and SiC Diodes DC-DC power stage based on MDmesh DM2 Power MOSFETs June 2016 DocID029425 Rev 2 1/11 www.st.com For further information contact your local STMicroelectronics sales office Additional information STEVAL-ISA172V2 1 Additional information The combination of the design choices results in boosted efficiency, in line with standard requirements in the power supply industry. The system is controlled by two STM32F334 microcontrollers, one for each section. This microcontroller adds innovative features such as a high-resolution timer, which gives increased accuracy in terms of current regulation on the primary PFC and on the secondary DC-DC phase-shifted full-bridge side. The two microcontrollers exchange information about the status of the input and output power stage via bidirectional serial communication. Both the power stage and control stage are supplied by an off-line flyback circuit based on the VIPer27H, which provides a suitable regulated voltage to the microcontrollers, as well as the gate driver ICs and the signal conditioning circuits. 2/11 DocID029425 Rev 2