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  MOSFET Safe Operating Area and Hot Swap Circuits &mdash LT Journal
  PDF, 559 Кб, Файл опубликован: 19 апр 2017
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  design ideas MOSFET Safe Operating Area and Hot Swap Circuits
  Dan Eddleman “Is this MOSFET’s SOA (safe operating area) adequate for my application?” This is the
  most frequently asked question by designers of hot swap circuits. When evaluating a
  MOSFET’s suitability for a specific application, it helps to have an intuitive understanding
  of SOA. After a short review of the SOA specifications found in MOSFET data sheets,
  this article presents a simple explanation of SOA, with a focus on MOSFET thermal
  behavior. With this understanding, designers can confidently use SOAtherm, a tool
  included with LTspice, to accurately evaluate MOSFET SOA in their circuit simulations.
  WHAT IS SOA? Every MOSFET data sheet includes an SOA
  plot, which describes the maximum time
  a MOSFET can be exposed to a specific
  voltage and current. Figure 1 shows the
  SOA plot from NXP Semiconductor’s data
  sheet for the PSMN1R5-30BLE 30V 1.5mО©
  N-channel MOSFET. Consider the condition where 10V at 100A is applied to the
  MOSFET. Looking at the corresponding
  point on the SOA plot, we see that it falls
  between the 1ms and 10ms lines. The plot
  indicates that you can apply 10V and 100A
  for at least 1ms without damaging the
  MOSFET if the case (tab) is held at 25В°C. Of course, holding the case at 25В°C is
  impossible, requiring an unattainably
  perfect heat sink, but fortunately, for short …

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