Quasi-resonant PFC IC has 750V GaN switch
AT APEC 2022, Power Integrations has released the HiperPFS-5 ICs, designed for compact, efficient power factor stage for fast adapters, consumer electronics, computer and appliance power supplies.
The HiperPFS-5 family of power factor correction (PFC) ICs with an integrated 750V PowiGaN GaN switch are efficient up to 98.3 per cent. The ICs deliver up to 240W without a heatsink and can achieve a power factor of better than 0.98.
HiperPFS-5 ICs are suitable for high-power USB PD adapters, TVs, game consoles, all-in-one computers and appliances.
Edward Ong, senior product marketing manager at Power Integrations, said: “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 HiperLCS2 chipset or our InnoSwitch4-CZ active-clamp flyback ICs, designers can easily 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.”
The capacitors and inductors used in power supplies generate a phase change between current and voltage, causing losses in the power lines and potentially disrupting other equipment connected to the AC mains. Many countries require power supplies over 75W to adjust for PFC.
HiperPFS-5’s innovative QR discontinuous conduction mode (DCM) control technique 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 per cent compared to conventional critical-conduction-mode (CRM) boost PFC circuits. Low switching and conduction losses are further reinforced by the PowiGaN switch, together with lossless current sensing.
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 per cent load. No-load power consumption is 38mW.
The robust 750V PowiGaN switch maintains a high power factor up to 305V AC and can operate continuously at up to 460V AC during line swells. The HiperPFS-5 ICs incorporate Power Integrations’ automatic X-capacitor discharge (CAPZero) function, including the required redundant pins to meet safety regulations, and high -voltage self-start-up in a low-profile, InSOP-T28F SMD power package. Exposed cooling pads in the package provide effective cooling and simplifying EMI. Digital line-peak-voltage detection ensures robust performance, even in the presence of distorted input from uninterruptible power supplies or generators, said Power Integrations.
The company also offers a reference design DER-672, available to download.
Power Integrations supplies semiconductor technologies for high voltage power conversion. The company’s products are building blocks in the clean power ecosystem, enabling the generation of renewable energy as well as the efficient transmission and consumption of power in applications ranging from mW to MW.
