# How to set the Rise time and Fall time of the MOSFET di/dt model

**URL:** <https://forum.plexim.com/t/how-to-set-the-rise-time-and-fall-time-of-the-mosfet-di-dt-model/690>\
**Category:** PLECS\
**Tags:** mosfet\
**Created:** [August 23, 2019, 9:06am UTC](https://forum.plexim.com/t/how-to-set-the-rise-time-and-fall-time-of-the-mosfet-di-dt-model/690 "2019-08-23T09:06:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Masamichi](https://avatars.discourse-cdn.com/v4/letter/m/7ab992/32.png) [@Masamichi](https://forum.plexim.com/u/Masamichi)\
**Post date:** [August 23, 2019, 9:06am UTC](https://forum.plexim.com/t/how-to-set-the-rise-time-and-fall-time-of-the-mosfet-di-dt-model/690/1 "2019-08-23T09:06:44Z")

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Hello.

I’m trying to apply di/dt model (MOSFET) for the inverter simulation.  
So I checked the datasheet of the FET(PGA26E07BA) and Rise time and Fall time.  
Rise time (tr) : 5.6 ns, Fall time (tf) : 2.4 ns  
(under the VDD = 400 V, IDS = 8 A)

I set this condition on the PLECS, but the Rise time and Fall time didn’t match.  
How can I set the Rise and Fall times accurately?

 ![datasheet(PGA26E07BA).png](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/1X/f67853b4f82aa189b22c1f74e8ca1d50e72da8ab.png)

 ![condition.png](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/1X/8220491b65b151032302990466dc851df2c0746c.png)

 ![condition2.png](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/1X/a62f015d6c62a8ec3845f8e455de5fb5a6571257.png)

 ![Rise time.png](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/1X/9e2d66b8f40904d129f8a1faf1affcc0fa5a88b5.png)

 ![Fall time.png](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/1X/fa27378be97d60ae5d9e7fa7b4738b2f311c015d.png)

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**Author:** ![Kris\_Eberle](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/kris_eberle/32/6_2.png) [@Kris\_Eberle](https://forum.plexim.com/u/Kris_Eberle)\
**Post date:** [August 23, 2019, 2:10pm UTC](https://forum.plexim.com/t/how-to-set-the-rise-time-and-fall-time-of-the-mosfet-di-dt-model/690/2 "2019-08-23T14:10:55Z")

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Hello,

The screenshots are helpful, but it is much easier to give feedback if you attach your model. Anyway, please see the help description for the “IGBT with Limited di/dt” component as there are example plots showing you what the rise and fall times are graphically. This should help you to verify that the model is correct.

Thank you,

Kris