Power Electronics Europe April/May Issue 2022

14 INDUSTRY NEWS Issue 2 2022 Power Electronics Europe www.power-mag.com Power Integrations announced at APEC 2022 the HiperPFS™-5 family of power-factor-correction (PFC) ICs with an integrated 750 V PowiGaN™ gallium-nitride switch. With efficiency of up to 98.3 percent, the new ICs deliver up to 240 W without a heat sink and can achieve a power factor of better than 0.98. In combination with the off-line LLC switcher IC (HiperLCS-2) featuring integrated 600 V FREDFETs, synchronous rectification and FluxLink feedback high-power USB PD adapters, and power supplies for TVs, game consoles, all-in-one computers. appliances, and even e-bikes can be designed. “We have combined our proprietary PowiGaN switch with a quasi-resonant, variable-frequency discontinuous mode boost PFC topology. By pairing HiperPFS-5 ICs with our new HiperLCS™2 chipset or our InnoSwitch™4-CZ active-clamp flyback ICs, designers can beat even the most aggressive efficiency regulations while cutting the bill of materials by half and achieving extremely attractive form factors for ultra-fast chargers,” commented Andy Smith, Director of Training at PI/San Jose. “Many countries require power supplies over 75 W to adjust a phase change between current and voltage with so-called power factor correction, or PFC. While there are many PFC solutions available, HiperPFS-5 ICs with PowiGaN technology and a quasi-resonant (QR) control adjusts the switching frequency across output load, input line voltage and input line cycle. QR DCM control ensures low switching losses and permits the use of a low-cost boost diode. The variable frequency engine allows the reduction of boost inductor size by more than 50 percent compared to conventional critical- conduction-mode (CRM) boost PFC circuits. Low switching and conduction losses—which are further reinforced by the PowiGaN switch— together with lossless current sensing, mean that HiperPFS-5 ICs offer high efficiency across the entire load range, with efficiency rising as high as 98.3 percent. HiperPFS-5 ICs provide a PF higher than 0.98 at full load. At light loads an innovative power-factor-enhancement (PFE) feature compensates for input filter capacitance, maintaining a high PF of 0.96 even at 20 percent load. No-load power consumption is just 38 mW.“ In many locations worldwide the mains power can be highly unstable, often leading to over- voltage failure of power supply components. HiperPFS-5 ICs maintain a high power factor up to 305 VAC and can operate continuously at up to 460 VAC during line swells. Additionally, X- capacitor discharge (CAPZero™) function works automatically, including the required redundant pins to meet safety regulations, and high-voltage self-start-up—all in a low-profile, InSOP™-T28F SMD power package. Exposed cooling pads are at source potential, providing effective cooling and simplifying EMI suppression. Digital line- peak-voltage detection ensures robust performance, even in the presence of distorted input from uninterruptable power supplies (UPS) or generators. LLC controller The HiperLCS-2 is designed for half bridge LLC converters, which are high-efficiency resonant ZVS, variable frequency converters. This IC chipset simplifies the design and manufacture of LLC resonant power converters. The LCS72xxC primary-side devices incorporate 600 V FREDFET in a half bridge arrangement with control, level shifting, drive and self-powered start-up. The LSR2000C master controller device provides reinforced isolated feedback, output sensing and SR management. HiperLCS-2 family devices incorporate multiple protection features including: line over and undervoltage protection, output overvoltage and over-temperature shutdown. Device fault response options support common combinations GaN Assisted PFC and LLC for High-Efficiency Power Supplies Two new power IC chipsets combine GaN assisted PFC and LLC for high-efficiency power supplies eliminating heatsinks