SIMPLICITY MEETS PERFORMANCE
ON A BUDGET
Boost efficiency with 1kW analog bridgeless PFC (BARBI topology) from ST & WE
The EVL4986A-1KWBL demonstration board is a bridgeless PFC pre-regulator, double boost topology, featuring 1 kW output power (400 Vdc) and a wide input voltage range (90 Vac-265 Vac) based on the new L4986A peak current mode CCM power factor controller. It is intended as a front-end converter up to 1 kW, able to comply with IEC61000-3-2 and JEITA-MITI.
The demo is designed on the double boost (Barbi) topology using two branches, each consisting of a boost stage, managing half the main cycle. Each section operates at an almost fixed frequency (65 kHz).
Thanks to the bridgeless approach and the L4986A control IC, the board offers high efficiency and low input current THD across the entire input voltage range.
This is achieved using a low-complexity schematic and fewer components compared to similar bridgeless solutions. The EMI standards are met in accordance with EN55022 Class-B thanks to the Würth Elektronik filter components.
EVL4986-1KWBL demonstration board
Figure: EVL4986-BL1KW 1.0 kW bridgeless PFC (BARBI) board schematic
Key features:
- • Input mains range: 90 to 265 Vac - frequency 45 to 65 Hz
- • Output voltage / load: 400 V / 2.5 A
- • Efficiency:
above 98% at 230 Vac (full load)
above 95.5% at 115 Vac (full load)
above 94% between 10% and 100% of full load
- • No load mains consumption: below 250 mW at 230 Vac
- • Mains harmonics in compliance with EN61000-3-2 Class-A and JEITA-MITI, Class-A
- • EMI in accordance with EN55022 Class-B
- • Safety in accordance with EN62368
- • Dimensions 145 x 160 mm, height = 35 mm
- • PCB: double sided, 70 µm, FR-4, mixed PTH/SMT
Featured Products from ST Microelectronics
L4986
CCM PFC controller with high voltage startup and power good
The L4986 is a peak current-mode PFC controller for boost converter with a proprietary multiplier 'emulator', which in addition to the innovative THD optimizers guarantees very low Total Harmonic Distortion (THD) performance in all operating conditions. The device comes in a pin SO package and offers a high-performance/low-component count solution for CCM-operated boost PFC pre-regulators in EN61000-3-2 and JEIDA-MITI compliant applications, in a power range that spans from a few hundred W to some kW. It embeds an 800 V high voltage start-up block and is available in two options- 65 kHz for A and 130 kHz for B.
Buy now
STW69N65M5
N-channel 650 V, 0.037 Ohm typ., 58 A MDmesh M5 Power MOSFET in TO-247 package
These devices are N-channel MDmesh™ V Power MOSFETs based on an innovative proprietary vertical process technology, combined with STMicroelectronics’ well-known PowerMESH™ horizontal layout structure. The resulting product has extremely low on-resistance, which is unmatched among silicon-based Power MOSFETs, making it especially suitable for applications that require superior power density and outstanding efficiency.
Buy now
STPSC12065
650V SiC diode
The SiC diode is an ultra high performance power Schottky diode. It is manufactured using a silicon carbide substrate. The wide band gap material allows the design of a Schottky diode structure with a 650 V rating. Due to the Schottky construction, no recovery is shown at turn-off and ringing patterns are negligible. The minimal capacitive turn-off behavior is independent of temperature. Housed in D²PAK HV, this diode is perfectly suited for PFC applications, charging stations, and DC/DC, easing compliance with IEC-60664-1.
Buy now
PM8834
4A dual LS gate driver
The PM8834 is a flexible, high-frequency dual low-side driver specifically designed to work with high-capacitive MOSFETs and IGBTs. Both PM8834 outputs can sink and source 4 A independently. A higher driving current can be obtained by connecting the two PWM outputs in parallel. The PM8834 provides two enable pins, which can be used to alow for the operation of one or both of the output lines. The PM8834 works with a CMOS/TTL-compatible PWM signal. The device is available in an SO8 or an MSOP8 package with an exposed pad.
Buy nowFeatured Products from Würth Elektronik
750319521
PFC boost inductor
The boost inductor 750319521 is designed to meet the high-efficiency requirements of the PFC topology in a small footprint with package PQ3535, which also provides a good EMC behavior.
Buy now
WCAP-FTBE
Film capacitors
The WCAP-FTBE are boxed type metallized polyester film capacitors, a general purpose product series. They are characterised by self-healing properties and a large voltage range from 100V(DC) to 1kV(DC).
Buy now
WE-CMBNC
Common mode power line choke
The WE-CMBNC are Common Mode Power Line Chokes with Nanocrystalline core material. This allows very high permeability and broadband suppression for common mode noise.
Buy now
WCAP-FTX2
Film capacitors
The WCAP-FTX2 is a product series for interference suppression, in safety class X2. They can be used then as filter components, for example in EMI filters for power supplies. They are characterised by self-healing properties characterise them and their dielectric is Polypropylene.
Buy now
