Power Innovation Could Save Greenhouse Gas Generation Equal to Emissions of Thousands of CarsNew superjunction MOSFETs featuring reduced gate charge increase energy efficiency in LCD TV power supplies and other electronics applications
Perfected only by a small number of manufacturers, superjunction technology allows power transistors to combine small size, high voltage capacity, and outstanding energy efficiency when turned on. ST is a world leader in this type of technology with its MDmesh power MOSFETs, and now delivers even better performance with its latest MDmesh II Plus™ Low Qg family. These devices feature a reduced internal charge for high efficiency when switching as well as when conducting, saving even more energy in resonant-type power supplies that are widely used in LCD TVs.
The enhanced design of the new devices results in a low gate charge (Qg) as well as low input and output capacitance. Each of these factors contributes to faster and more efficient switching, which encourages designers to use superjunction transistors in the resonant type of power supplies typically seen in LCD TVs. Until now, superjunction transistors have been used most effectively in hard-switching topologies, where the device is made to switch even while the current and voltage remain high. In a resonant power supply two inductors and a capacitor (LLC converter) ensure the transistor is switched at zero voltage to smooth the flow of energy in the system and help increase efficiency. The new MDmesh II PlusTM Low Qg family is also highly resistant to the effects of large and sudden changes in applied voltage (high dv/dt ruggedness), which can damage transistors and cause spurious switching. This allows the latest devices to perform reliably even when exposed to large voltage transients such as noise and harmonics on AC power lines.
The first MDmesh II PlusTM Low Qg device to enter production is the STP24N60M2 in the TO-220 package. Unit pricing is $2.50 for volumes in the range of 1,000 pieces. If your company has a high-volume need, please contact your ST sales office. ST will expand the family to include over 50 devices, in a variety of packages such as TO-220FP, I2PAK, I2PAK FP, D2PAK, TO-247 and PowerFLAT 8x8.
Major features of STP24N60M2:
• On-state resistance (RDS(ON)): 190mΩ
• Breakdown voltage: 600V
• Maximum continuous drain current (ID): 18A
• dv/dt ruggedness: 50V/ns
• 100% avalanche tested
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2Based on a 0.5% efficiency increase at half load (100W), saving 3Wh per day assuming average TV usage of 6 hours per day, hence saving around 1kWh per year per TV. In 200 million TVs, global saving is 200GWh. US Environmental Protection Agency (www.epa.gov) equivalence calculator equates this to 141,110 tons CO2 equivalent, matching greenhouse gas emissions of 29,328 passenger vehicles