Targeting applications with continuous power demands up to 405 W for universal input and 900 W for high-line, the ICs feature efficiency levels of better than 95% from 10% load to full load, and consume less than 60 mW under no-load conditions. A power factor of above 0,92 is easily achievable at 20% load.
The highly integrated devices include the variable frequency CCM controller, high-voltage power MOSFET and a Qspeed low-QRR boost diode. They also employ an innovative means of controlling EMI without adversely affecting power factor at light loads.
Poor system power factor at light load is caused by X capacitors that are used to reduce differential mode EMI being fed back to the AC line. HiperPFS-3 ICs incorporate a digital power factor enhancing circuit that activates during light load conditions; this increases the compensation to overcome the reactance of X capacitors in the EMI filter, minimising the phase angle difference between the input voltage and the current. Consequently, designers may increase the size of the X capacitors while minimising or eliminating differential-mode chokes.
Available for both high and low-line applications, HiperPFS-3 ICs cover a continuous output power up to 900 W, with thermally efficient eSIP-16 packaging that simplifies heatsink mounting.
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