Superjunction MOSFETs claim lowest on-resistance

May 06, 2013 // By Graham Prophet
Infineon's CoolMOS C7 technology is, the company says, a significant step in superjunction structures that results in the lowest-available RDS(on) for hard switching applications

Infineon Technologies has expanded its high voltage portfolio with CoolMOS C7, a 650-V Superjunction MOSFET technology, asserting best-in-class RDS(on) for all standard packages and - thanks to its low switching losses - efficiency improvements over the full load range. C7 is optimised for hard switching topologies such as continuous conduction mode power factor correction (CCM PFC), two transistor forward (TTF) and solar boost. Typical applications are solar, server, telecom and UPS (uninterruptible power supply). The 650V breakdown voltage also makes C7 suitable for applications which require extra safety margin.

“The C7 series continues a 12-year innovation path of high quality Superjunction CoolMOS technology strengthening Infineon’s leadership in high-end power conversion,” says Jan-Willem Reynaerts, Product Segment Head of High Voltage Power Conversion at Infineon Technologies. “With CoolMOS C7´s Best-in-Class Figure of Merit (RDS(on)*EOSS), our customers are enabled to design a new generation of power conversion systems with an unprecedented combination of improved power density as well as efficiency.”

The C7 series offers R DS(on) of 19 mΩ in a TO-247 package and 45 mΩ in the TO-220 and D 2PAK packages. The fast switching performance of C7 now enables designs operate at switching frequencies greater than 100 kHz whilst achieving “Titanium” levels of efficiency in Server PFC stages. This enables higher power density by reducing the space requirements for the passive components.

Reduced energy in the output capacitance (Eoss) as well as the low gate charge (Qg) bring efficiency benefits also at light load conditions. Combining C7 with Infineon’s new silicon carbide (SiC) thinQ! generation-5 Schottky diode series and the ICE2 / ICE3 control ICs offers designers unrivaled performance for CCM PFC circuits.