# IGBT module speed explanation

#### Perwin CZ

Joined May 8, 2017
6
Hello,
could anybody explain me what the speed of IGBT in the datasheet of VS-GP250SA60S (link) means?
There is: "DC to 1 kHz" - but what does it mean? Does it mean that the IGBT module can't operate in higher frequencies than 1 kHz? And what is the "DC" there - duty cycle??

I don't understand it because values of turn-on delay time, turn-off delay time, rise time and fall time give together 300+515+85+450 = 1350 ns, which should give maximum speed around 740.7 kHz.
I would like to use this or similar module for induction heating where the operation frequencies are around 70 kHz so I need to be sure (it is pretty expensive...).

Thank you very much for your replies.

#### Perwin CZ

Joined May 8, 2017
6
I have read the document and it is useful, but I don't understand how I should calculate max switching frequency for that IGBT module I posted, or if I should stick with the 1 kHz value from the datasheet and find another (faster) module.

#### ian field

Joined Oct 27, 2012
6,539
Hello,
could anybody explain me what the speed of IGBT in the datasheet of VS-GP250SA60S (link) means?
There is: "DC to 1 kHz" - but what does it mean? Does it mean that the IGBT module can't operate in higher frequencies than 1 kHz? And what is the "DC" there - duty cycle??

I don't understand it because values of turn-on delay time, turn-off delay time, rise time and fall time give together 300+515+85+450 = 1350 ns, which should give maximum speed around 740.7 kHz.
I would like to use this or similar module for induction heating where the operation frequencies are around 70 kHz so I need to be sure (it is pretty expensive...).

Thank you very much for your replies.
An IGBT is basically a hybrid Szicklai pair - a MOSFET driving an emitter follower. Emitter follower is the slowest of the 3 configurations.

But it should do a *LOT* better than 1kHz. You might want to start thinking of straight MOSFETs somewhere around 35kHz.

IGBTs were developed for the VCEsat of a BJT when the RDSon of early MOSFETs wasn't much good.

Modern MOSFETs are much better - its worth a good look at whether you actually gain anything using IGBTs.