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Home arrow Power Supply Blog arrow Low-Line Overstress of Constant-Power Loads(3 of 4)

Low-Line Overstress of Constant-Power Loads(3 of 4)

Solution

Once the problem is understood, the solution is usually straight forward.

  • Select the turn-on voltage for the power supply
  • design a sense circuit for this voltage with hysteresis
  • use the circuit to inhibit turn-on until the proper voltages are reached
  • add soft start to minimize the load transient at turn-on
  • and then by means of simulation and lab measurements, check the transient stress on components during turn-on and turn-off, especially the V-I trajectories of semiconductor switches in relation to their safe-operating area

Do not use this information for design without independent verification of the information.

Editor: Jerrold Foutz

 
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