Power Integrations Introduces High Efficiency Quasi-Resonant PFC IC with Integrated 750V GaN Switch

     Power Integrations announces the HiperPFS™-5 family of Power Factor Correction (PFC) ICs with internal integration of 750V PowiGaN™ GaN switches. The new ICs are 98.3% efficient, deliver up to 240W of output power without a heatsink, and achieve a power factor of better than 0.98. HiperPFS-5 ICs are ideal for high power USB PD adapters, TVs, game consoles, all-in-one PCs and home appliance applications.

     Edward Ong, senior product marketing manager at Power Integrations, said: "With OEMs and non-OEM suppliers competing to introduce the fastest, smallest and most versatile USB PD chargers for mobile devices, the HiperPFS-5 IC can provide engineers with Provides key advantages. We have achieved a combination of PI's unique PowiGaN switch with a quasi-resonant, variable frequency discontinuous conduction mode boost PFC topology. Whereas if we combine the HiperPFS-5 IC with our new HiperLCS™2 chipset or InnoSwitch Combined with the ™4-CZ active clamp flyback IC, design engineers can easily exceed the most stringent efficiency standards while cutting the bill of materials in half to design a compact ultra-fast charger."

     Capacitors and inductances used in power supplies create phase changes between current and voltage, causing power losses in transmission lines and potentially interfering with other equipment connected to the AC power source. Many countries and regions require power supplies with input power greater than 75W to use power factor correction (PFC) circuits to reduce this effect. While there are a variety of PFC solutions on the market, the HiperPFS-5 IC with PowiGaN technology and Quasi-Resonant (QR) control scheme stands out as an excellent example of improving power quality for offline applications.

     HiperPFS-5's innovative Quasi-Resonant (QR) Discontinuous Conduction Mode (DCM) control technology adjusts the switching frequency over different output loads, input voltages and line frequency periods. DCM control in QR mode reduces switching losses and allows the use of low-cost boost diodes. Compared with the traditional critical conduction mode (CRM) boost PFC circuit, the variable frequency engine can reduce the size of the boost inductor by more than 50%. With low switching and conduction losses (a benefit further enhanced by PowiGaN switches) and lossless current sensing, the HiperPFS-5 IC delivers consistently high efficiency over the entire load range with efficiencies as high as 98.3%. The HiperPFS-5 IC provides a power factor (PF) higher than 0.98 at full load. Under light load, the innovative Power Factor Enhancement (PFE) function can reduce the influence of input filter capacitor on power factor, maintaining a high PF of 0.96 even under 20% load, and the no-load power consumption is only 38mW.

      Additional benefits come from durable 750V PowiGaN switches. In many places around the world, power grids can be very unstable, often causing overvoltage damage to power components. The HiperPFS-5 IC can maintain high power factor at input voltages up to 305VAC and can operate continuously during input voltage dips up to 460VAC. In addition, the HiperPFS-5 IC integrates Power Integrations' X-capacitor auto-discharge (CAPZero™) function, including redundant pin design for safety compliance and high voltage self-powering at startup - all in an ultra-thin InSOP™-T28F SMD power package.

     The exposed pad potential in the package is the source of the switch tube, which can reduce the cost of EMI filtering while providing effective heat dissipation. Digital input voltage peak detection ensures reliable performance, even in the presence of voltage distortions from uninterruptible power supplies (UPS) or generator supplies.