It eliminates the need for a conventional four-diode rectifier bridge, using two MOSFETs as a synchronous rectifier to increase efficiency. Despite the lack of a bridge, it can be controlled with an analog controller and does not require a complex transistor driver circuit, as the switches are controlled solely by low-side (LS) gate drivers.
The EVL4986A-1KWBL demo board, based on a dual-boost (BARBI) topology, serves as a bridgeless PFC pre-regulator capable of delivering 1 kW (400 VDC) output power and a wide input voltage range of 90 VAC to 265 VAC. It is based on the new L4986A peak current mode CCM power factor controller and can function as a front-end converter up to 1 kW. This board is designed to comply with IEC61000-3-2 and JEITA-MITI standards.
Key features include:
- Mains input range: 90 to 265 VAC at a frequency of 45 to 65 Hz
- Load/output voltage: 400 V / 2.5 A
- High performance: over 98% at 230 VAC (full load), over 95.5% at 115 VAC (full load) and over 94% between 10% and 100% of full load.
- Low no-load mains consumption: less than 250 mW at 230 VAC
- Network harmonics compliant with EN61000-3-2 Class-A and JEITA-MITI, Class-A
- EMI compliance with EN55022 Class-B
- Safety compliance with EN62368 standard
- Dimensions 145 x 160 mm, height = 35 mm
- PCB: double-sided, made of 70 µm FR-4 and with a mixed PTH/SMT design
The ST Microelectronics products featured on the board include the L4986 PFC CCM driver, the STW69N65M5 power MOSFET, the STPSC12065 SiC diode , and the PM8834 dual LS gate driver. These components are suitable for a wide variety of applications requiring high efficiency, superior power density, and exceptional performance.
Würth Elektronik supplies the 750319521 PFC boost inductor , the WCAP-FTBE and WCAP-FTX2 film capacitors , and the WE-CMBNC common-mode power line choke . These components are designed to meet the high-efficiency requirements of power factor correction topologies and offer superior EMC performance, self-healing properties, and broadband suppression of common-mode noise.
The board can be used in industrial and medical switched-mode power supplies, high-power LED lighting, consumer electronics, and server power supplies. The L4986 driver offers a low component count solution with high efficiency and low total harmonic distortion (THD) performance under all operating conditions, making it ideal for a variety of power electronics applications.
The EVL4986-1KWBL demo board is available from stock at Farnell in Europe, Newark in North America, and element14 in Asia Pacific.
