The new HiperPFSTM-3 Power factor correction IC from Power Integrations improves the light load performance of power supplies

     Power Integrations announced the introduction of the HiperPFSTM-3 series of power factor correction ics, new devices that deliver high power factor and high efficiency across the entire load range. The IC series is ideal for applications requiring continuous output power of up to 405 W with general purpose inputs and peak power of up to 900 W with high voltage inputs, with over 95% efficiency from 10% load point to full load and less than 60 mW of no-load power consumption. The power factor can easily reach more than 0.92 at 20% load point.

     The highly integrated HiperPFS-3 device includes a variable frequency CCM controller, high voltage power MOSFETs, and a Qspeed™ low QRR boost diode. The new device also incorporates an innovative EMI control that does not adversely affect the power factor at light loads. The X capacitance used to reduce differential mode EMI being fed back to the AC line can result in poor system power factor under light load. The HiperPFS-3 IC integrates a digital power factor enhancement circuit that can be activated under light load.

     The circuit can add phase shift compensation to overcome the reactance of the X capacitor in the EMI filter circuit, thereby reducing the phase Angle difference between the input voltage and the current. As a result, designers can increase the size of the X capacitor while reducing or eliminating the differential mode choke, thereby reducing EMI without compromising light load power factor performance. This reduces the cost of the EMI filter stage and reduces its size.

     Edward Ong, product Marketing Manager at Power Integrations, said: "Standby energy standards, such as ErP Lot 6, have previously forced designers of PCS and other systems to design both a primary power supply and a standby power supply. "Our new HiperPFS-3 IC has excellent light-load efficiency, which eliminates the need for designers to design standby power supplies, saving components, design time and space, and reducing costs."