SLC06S065

In PFC boost circuits, the diode reverse recovery causes significant switching losses. When the MOSFET turns on, it must conduct the reverse recovery current of the diode before the diode blocks voltage. This causes: High turn-on losses in the MOSFET; EMI from the sharp current spike; and Efficiency reduction proportional to switching frequency. At 100kHz, reverse recovery losses can be 1-2% of total power. SiC Schottky diodes have zero reverse recovery, eliminating these losses completely. This is why SiC diodes provide the biggest efficiency improvement in hard-switching topologies like PFC boost.

For PFC applications above 50kHz, SiC diodes are highly recommended. Contact our FAE team for efficiency calculations and cost-benefit analysis.

Yes, SiC Schottky diodes can be paralleled for higher current applications. Unlike silicon diodes, SiC diodes have positive temperature coefficient of forward voltage, meaning they naturally share current when paralleled. As one diode heats up, its forward voltage increases, reducing its current share and balancing with cooler devices. This self-balancing makes paralleling straightforward without external balancing components. However, ensure symmetrical layout with equal trace lengths and impedances to each diode for best current sharing.

For currents above 6A, parallel multiple SLC06S065 diodes. Our FAE team can provide layout guidelines for optimal current sharing.

The required heatsinking depends on forward current and duty cycle. At 6A continuous with 1.4V forward voltage, conduction loss is 8.4W. With RthJC=1.5°C/W and RthCS=0.5°C/W, and maximum Tj=175°C: RthSA = (175 - Ta) / 8.4 - 1.5 - 0.5. At 40°C ambient, RthSA = (175-40)/8.4 - 2 = 14°C/W. This allows natural convection cooling with a small heatsink. For higher currents or temperatures, larger heatsinks or forced air may be needed. Always calculate based on your actual operating conditions.

Calculate thermal requirements based on your specific current and duty cycle. Contact our FAE team for thermal modeling and heatsink selection.

SiC diodes have positive temperature coefficient of forward voltage - as temperature increases, forward voltage increases (opposite to silicon diodes). This is beneficial for paralleling as it promotes current sharing. However, it means conduction losses increase at high temperatures. Forward voltage typically increases 20-30% from 25°C to 175°C. Leakage current increases with temperature but remains much lower than silicon diodes even at 175°C. The maximum junction temperature of 175°C provides significant thermal margin compared to silicon's 150°C limit.

Design for worst-case temperature with adequate margin. Use the forward voltage at operating temperature for loss calculations. Our FAE team can provide temperature-dependent models.

Yes, SiC Schottky diodes can replace silicon ultrafast diodes in most applications with significant benefits. The replacement is straightforward - same package, similar forward voltage, but zero reverse recovery. Benefits include: Elimination of reverse recovery losses; No snubber circuits needed; Higher frequency operation possible; and Cooler operation due to lower losses. The main consideration is cost - SiC diodes are more expensive. The payback comes from improved efficiency, reduced cooling, and potentially smaller magnetics from higher frequency operation.

For high-frequency or high-efficiency applications, SiC diodes are excellent replacements. Contact our FAE team for replacement recommendations and efficiency calculations.