Simple selection for MOSFETs
19 December 2008
National’s WEBENCH design environment enables novice as well as experienced power supply designers to easily ‘dial-in’ their size and efficiency requirements while also realising fast time to market.
The new MOSFET selection tool is the first to provide end-to-end support for switching controller designs, including MOSFET selection, MOSFET optimisation and design simulation. The tool includes technical data on a variety of vendors’ MOSFETs, allowing the designer to sort and select MOSFETs by thermal parameters,
power dissipation and price.
Optimisation graphs and charts offer views of the impact of optimising the design for efficiency or footprint over various operating ranges. The designer can analyse power dissipation of the MOSFETs at different
frequencies, efficiencies and footprints as well as over the load current and input voltage operating ranges.
Once the MOSFETs are selected and optimised, National’s WEBENCH design environment provides electrical simulation of the complete circuit’s dynamic behaviour in both frequency and time domains. The
designer can then run thermal simulations of the complete solution, including the MOSFETs, to analyse thermal characteristics of the design. When complete, a design report summary is created and a custom prototype power supply kit can be ordered.
At the same time as launching the selection tool, National (www.national.com) also introduced the new PowerWise Simple Switcher controller family that includes four synchronous buck controllers well-suited for
communications and industrial systems. The LM3150 features an adjustable switching frequency and output voltage, and the LM3151, LM3152 and LM3153 feature a range of fixed frequencies along with a fixed
3.3V output voltage. Input voltages for the Simple Switcher controllers range from 6V to 42V with output current capability up to 12A. The controllers require minimal external components, which simplifies the design process and reduces the overall solution size. The new Simple Switcher controllers feature 93% peak efficiency at load, positioning them among National’s PowerWise family of energyefficient products.
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