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Quasi-Resonant PFC IC Features 750 V GaN Switch

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. HiperPFS-5 ICs are suited for high-power USB PD adapters, TVs, game consoles, all-in-one computers. Appliances, and even e-bikes. “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.

Devices are priced at $2.34 in 10,000-unit quantities. Reference design DER-672 is available to download.

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