Silicon carbide mosfet module solutions for charging EVs
When it comes to the EV infrastructure market, requirements are rapidly evolving, requiring power levels in excess of 350 kW and efficiencies of 95% becoming the ‘norm’. Given the diverse environments and locations in which these chargers are deployed, compactness, robustness and enhanced reliability are seen as critical.
These new 1200 V M1 full SiC MOSFET 2 pack modules, based upon planar technology and suited to a drive voltage in the range of 18-20 V, are simple to drive with negative gate voltages. The larger die reduces thermal resistance compared to trench mosfets, reducing die temperature at the same operating temperature.
Configured as a 2-PACK half bridge, the NXH010P120MNF is a 10 mohm device housed in an F1 package while the NXH006P120MNF2 is a 6 mohm device in an F2 package. The packages feature press-fit pins making them ideal for industrial applications and an embedded negative temperature coefficient (NTC) thermistor facilitates temperature monitoring.
As part of the ON Semiconductor EV charging ecosystem, the new SiC MOSFET modules have been designed to work alongside driver solutions such as the NCD5700x devices. The recently introduced NCD57252 dual channel isolated IGBT/MOSFET gate driver offers 5 kV of galvanic isolation and can be configured for dual low-side, dual high-side or half-bridge operation.
The NCD57252 is housed in a small SOIC-16 wide body package and accepts logic level inputs (3.3 V, 5 V & 15 V). The high current device (source 4.0 A / sink 6.0 A at Miller plateau voltage) is suitable for high-speed operation as typical propagation delays are 60ns.
Complementing these new modules and gate driver are the ON Semiconductor SiC MOSFETs that provide superior switching performance and enhanced thermals when compared to similar silicon devices.
The recently-announced 650 V SiC MOSFETs employ a novel active cell design combined with advanced thin wafer technology enabling a best-in-class figure of merit (FoM) for (RDS(on)*area). Devices in the series such as the NVBG015N065SC1, NTBG015N065SC1, NVH4L015N065SC1 and NTH4L015N065SC offer the lowest RDS(on) currently in the market for D2PAK7L / TO247 packaged MOSFETs.
The 1200 V and 900 V N-channel SiC MOSFETs feature a small chip size that reduces device capacitance and gate charge (Qg – as low as 220 nC), reducing switching losses when operating at the high frequencies demanded by EV chargers.