IGBT gate resistance value calculation.

VAgar.2 · ‎2021-05-19

Q1. How to calculate IGBT gate resistance.

I want to use STGD18N40LZ IGBT for operating an inductive switching load.

Switching freq:- Between 400Hz to 1Khz

Collector to Emitter voltage:- 24V.

Avg Max current :- 5A.

Q2. What will be impact If I use 1Kohm resistance?

Peter BENSCH · ‎2021-05-19

The STGD18N40LZ already contains a built-in gate resistance of typ. 1.6kohms.

By the way: because of the conduction losses it doesn't really make sense to operate a 360V IGBT with 24V, a MOSFET can do better.

Good luck!

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/Peter

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View solution in original post

Peter BENSCH · ‎2021-05-19

The STGD18N40LZ already contains a built-in gate resistance of typ. 1.6kohms.

By the way: because of the conduction losses it doesn't really make sense to operate a 360V IGBT with 24V, a MOSFET can do better.

Good luck!

If the problem is resolved, please mark this topic as answered by selecting Select as best. This will help other users find that answer faster.

/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

VAgar.2 · ‎2021-05-20

Thanks for response.

If I choose MOSFET to drive it by 5V at 5A in D2pak.

Does it less costly with IGBT.

Application :- Automotive, 12 V battery system.

Peter BENSCH · ‎2021-05-20

An IGBT does not make sense at 12V because its collector-emitter saturation voltage is relatively high and would generate high power dissipation.

On the other hand, we cannot recommend a specific device without knowing the environment, like driving parameters, type of load, etc.

Regards,

Peter

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