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  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Review the ZθJC Graph
  6. 3Using the ZθJC Graph to Estimate Junction Temperature Rise
  7. 4Application Example
  8. 5Using the ZθJC Graph to Estimate MOSFET Peak Current Capability
  9. 6Application Example
  10. 7Summary
  11. 8References

5 Using the ZθJC Graph to Estimate MOSFET Peak Current Capability

The ZθJC graph can also be useful during FET selection when the peak current requirement is known. As shown in this application brief, the FET maximum continuous drain current at TC = 25°C is calculated as follows:

Equation 3. M a x   I D ( T C = 25 ℃ ) = M a x   T J - 25 ℃ R θ J C R D S ( o n ) @ M a x   T J

For single pulse or repetitive pulses, the thermal resistance is multiplied by the normalized transient thermal impedance value from the ZθJC graph. Now the calculation for peak drain current becomes:

Equation 4. P e a k   I D ( T C = 25 ℃ ) = M a x   T J - 25 ℃ Z θ J C × R θ J C R D S ( o n ) @ M a x   T J