28 PRODUCT UPDATE Issue 2 2023 Power Electronics Europe www.power-mag.com The planar transformers have features required to meet today’s high frequency, smaller space power conversion application requirements, said the company. These forward converter transformers have high volumetric power density and low loss in a compact, low height package. They also have enhanced thermal conduction and heat dissipation for greater reliability. Planar-style transformer components increase design flexibility and offer efficiency advantages over conventional wirewound transformer designs due to significantly reduced AC resistance losses, explains Bourns. The PLN0xx-ED21 transformers have leakage inductance from 0.29?H to 0.60?H and a volt-second time of 81.6V-µsec. The series offers 33 to 57V input voltage, 5.0 to 12V output voltage at 4.0 to 14A output with various turns ratios. As a result, the planar transformers are suitable for power conversion in high density industrial power systems, low profile switched mode power supplies (SMPS), LED lighting applications, battery management systems and PoE applications. Standard PWB material is used for the transformer windings, which are soldered to an SMT header to create a surface mount component designed for ease of assembly. The company’s custom magnetics product engineers are able to support many modification and customisation requests. The PLN0xx-ED21 series planar transformers are available now and are RoHS-compliant. Planar transformer series is engineered for high frequency, smaller spaces The AC/DC power supply has a package size of 1.6 x 2.0 x 1.0 inch or 40 x 52.5 x 25.5mm. The RACM30-K/277 series provides 30W continuous power (36W peak) across an ambient range of -40°C to 60°C in free air and up to 90°C with derating. The wide input range is 85 to 305V AC (120 to 430V DC) and regulated and fully protected outputs available are 5.0, 12, 15, 24, ±12 and ±15V, rated as ‘limited power source’. The class II insulation parts are rated for harsh overvoltage category III (OVC III) and pollution degree 3 (PD3) environments up to 5000m altitude. Safety certifications include audio/video, IT, test equipment, industrial, household, and MOPP medical, with 4kVAC/1 min, rated isolation. No-load/standby dissipation meets eco-design requirements with near-flat efficiency curves down to light loads and all parts meet ‘class B’ EMC standards with a wide margin without external components, even with grounded outputs. The RACM30-K/277 series uses silicon-free encapsulation and the boardmount module has an industry-standard pinout. The parts are optionally available with flying leads or as panel-mounted with clip accessories to enable DIN-rail mounting. Typical applications for the series include house-keeping power in EV chargers, industrial automation, lighting, IoT, medical, and smart energy systems. The AC/DC power supplies are covered by a three-year warranty. Samples and OEM pricing are available from all authorised distributors or directly from the manufacturer. Power AC/DC converters from Recom extend board mount range Three automotive-grade, surface-mount standard rectifiers are the industry’s first devices in the low profile DFN3820A package with wettable flanks, says Vishay Intertechnology. The 2A SE20Nx, 3A SE30Nx and 4A SE40Nx space-saving, high efficiency rectifiers are for power line polarity protection and rail to rail protection in commercial, industrial, and automotive applications. They are available with reverse voltages of 200V, 400V and 600V. The first package in Vishay’s Power DFN family, the DFN3820A, has a 3.8 x 2.0mm footprint and a low typical height of 0.88mm. According to Vishay General Semiconductor, the rectifiers make more efficient use of PCB space and have optimised copper mass design and advanced die placement technology for thermal performance that enables operation at higher current ratings. Compared to devices in the SMP (DO-220AA) package with the same footprint, the AEC-Q101-qualified SE20Nx, SE30Nx, and SE40Nx offer a 12% lower profile and double the current rating. They also offer equivalent or higher current ratings to larger devices in the conventional SMB (DO-214AA) and SMC (DO-214AB) packages, as well as the eSMP series SlimSMA (DO-221AC), SlimSMAW (DO-221AD), SMPA (DO-2212BC), and SMPC (TO-2778A). They have an oxide planar chip junction design, allowing the rectifiers to offer typical reverse leakage current of less than 0.1?A. The low forward voltage drop down to 0.86V to reduce power losses to improve efficiency. The devices operate over a wide temperature range from -55°C to 175°C and provide ESD capability in compliance with IEC 61000-4-2, air discharge mode. The rectifiers are suitable for automated placement, the rectifiers offer a MSL moisture sensitivity level of 1, per J-STD-020, LF maximum peak of 260°C. The devices are RoHS-compliant and halogen-free. Samples and production quantities of the surface-mount standard rectifiers in a DFN3820A package are available now, with lead times of 12 weeks. Vishay offers high current rectifiers in DFN package
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