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Please recommned a MOSFET for high voltage, high current, linear mode operation

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rhodesengr
rhodesengr Contributor Level 1
edited June 2 in Discrete Products

I would like to help selecting a MOSFET for my application. I am building a laser diode driver configured as a high-side voltage controlled current source. The laser diode is on the high-side, a current sense resistor is on the low-side, and an op amp tries to keep the current (voltage across the sense resistor) equal to a rectangular input pulse from an SRS DG645.

Pulse width:10-microseconds

Rise and fall times: about 1-microsecond

Rep rate: once every 10 seconds, essentially no average powder

Drive voltage (0-500V)

Current pulse (0-600amps)

It would be OK to parallel a small number of MOSFETS but I don't want to put any in series so I figure I need at least a 750V device. I need a device that is in stock at the usual distributors.

A low voltage prototype is shown in the attached diagram. Now I need to scale it up to about 500V.

50V VCCS.jpg

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  • Forum_Moderator
    Forum_Moderator Wolfspeed Employee - Contributor Level 5
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    Thank you for your post, it has been approved and we will respond as soon as possible.

  • AAnders
    AAnders Wolfspeed Admin - Contributor Level 4
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    Hello,

    Thank you for your post. Linear mode operation is not generally recommended for our MOSFETs, however, under certain conditions it may be acceptable. I will close this post and follow up with you over email to discuss the specifics for your application in more detail.

    Thanks,

    Adam

This discussion has been closed.