STMicroelectronics STS6NF20V | Demoboard STEVAL-TTPPFC01 AN5964

Description

Nowadays, in PFC for servers and telecom (for example, PSU for 5G base stations, grid connected smart systems) theachievement of an efficiency >99% is becoming mandatory. The demand for very high efficiency has a strong impact ontopologies, design parameters, materials, and control strategies.The STEVAL-TTPPFC01 offers a very high flat efficiency PFC solution in a full digital three-channel interleaved totem poletopology. A conversion efficiency of 99.3% is obtained using ST MDmesh DM6 superjunction power MOSFETs, as well as avery high power factor and low THDi. The PFC operates in the zero voltage switching (ZVS) resonant mode with hysteresiscurrent control, which is fully implemented in the STM32G474QE microcontroller, thanks to the integrated DACs, fast comparators, and high-resolution timer peripheral HRTIM, to ensure a high dynamic and precise cycle-by-cycle current control.The STEVAL-TTPPFC01 evaluation kit is a modular solution, which consists of a power board, which contains all the mainpassive devices and all the daughter boards plug connectors; a control board, which embeds the STM32G474QE microcontroller; an auxiliary power supply board, which generates all the voltages for driving, sensing, MCU, etc.; three high frequency half-bridge boards; a low-frequency half-bridge board.

Features

• Bridgeless topology: the large input bridge losses of conventional PFCs (diode forward voltage losses) are dramatically reduced thanks to the use of active switches for the mains rectification function (Rds (on) losses in a MOSFET).
• Interleaved architecture: thanks to the phase shedding (enabling/disabling the parallel channels basing on the load requirement) the light load efficiency is improved and a flat efficiency over the whole load range is obtained. Moreover, the superposition of the inductor currents of each boost cell results in a smooth mains current waveform (EMI filter and inductors volume reduction) and output capacitor loss reduction (lower equivalent inductor current ripple).
• Zero voltage switching (ZVS) resonant technique: eliminates the turn-on losses of the power switches over the full mains period to further improve converter efficiency

Typical applications

• Power Supply and converters

More information

• Datasheet
• IC product information