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CRD250DA12E-XM3 dv/dt characteristics

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ZAO
ZAO Contributor Level 1
edited December 2025 in General

Hi,

I recently started working with the CRD250DA12E-XM3 inverter:

https://www.wolfspeed.com/products/power/reference-designs/crd250da12e-xm3/

I would like to understand the dv/dt characteristics of this device better. Answers or pointers to the correct direction for the following questions would be much appreciated:

What are the different ways to alter the dv/dt of the device? From the existing datasheet, Vds and rise time, which are affected by the external gate resistance (is it by default that no external gate resistance is connected?) and junction temperature, both impact the dv/dt value. Are these all the factors that affect dv/dt?

How stable is the dv/dt under fixed conditions? How long does it take for the device to reach steady state? And is there a way to keep the dv/dt constant over a long period of time?

Many thanks.

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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.

  • sjjimenezc
    sjjimenezc Wolfspeed Employee - Contributor Level 1
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    Hi Zao,

    Thank you for reaching out to our forum and for choosing Wolfspeed products.

    For hard-switched SiC devices, dv/dt is primarily influenced by:

    1. Gate drive strength and impedance seen by the SiC MOSFET gate
    2. Module and bus parasitics
    3. Operating conditions such as bus voltage, load current, and junction temperature

    From a system-level perspective, once the maximum operating temperature, voltage, and current are defined, the external gate resistance (RG) becomes the main tool to adjust the slew rate. Increasing RG will reduce dv/dt, while decreasing it will increase dv/dt. When selecting RG, it is important to ensure that voltage overshoot remains within the device rated limits.

    Under fixed conditions (RG, temperature, voltage, and current), the slew rate is very stable. You can expect consistent dv/dt performance when sending repetitive pulses in these conditions.

    Regarding thermal performance and the time to reach steady state, it is highly dependent on the cooling system, more specifically the coolant temperature, flow rate, and the coolant composition. In general, the system will reach thermal steady state within a few seconds after the maximum current is applied.

    Hopefully this helps. Please let us know if you have further questions.

    Best regards,

    Sergio J.

    ZAO
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