What is the difference between "Dead Time" and "SW Dead Time"? (MC SDK)

[yang2]

Dear All, 

I just stat to evaluate the MC SDK. 

My platform: MC SDK v6.3.0, NUCLEO-H563ZI, X-NUCLEO-IHM08M1.

 

Have anyone know what's the difference between "Dead Time" and "SW Dead Time" as follow figure?

Per it's default configuration, (SW dead-time is 850ns,  dead time is 1000ns), what is the exact value of dead-time to the power stage?

Best Regards,

 

 

[Jacob WOODRUFF]

Hi All,

 

This post has been escalated to the ST Online Support Team for additional assistance. We'll contact you directly.

 

Regards,
Jake

ST Support

[DMeie.2]

@Jacob WOODRUFF 

Since this is a community forum and others (me included) might be interested in the solution to this question as well, could you put the answere here?

[OHarc.1]

@Jacob WOODRUFF @yang2 

 

Was there ever an answer to this please?

Many thanks,

Owen

[Lina_DABASINSKAITE]

Hello @OHarc.1 , 

Thanks for your interest on this topic!

I am checking with our Online support team if they can provide a public response to this. Thank you for your patience. 

Regards,
Lina

[bingbong]

Hello @Lina_DABASINSKAITE 

Do you have any update on this? I am also curious what the answer is.

[GMA]

Hello @bingbong,

Refer to the PWM generation chapter in the MCSDK6.4x user manual, which is available through "Workbench tool > About > Documentations > Documentation".

[bingbong]

Thanks!

For anyone wondering, it is in this path: 
*MCSDK_INSTALLATION_PATH*\Documentation\html\md_docs_2_p_w_m___generation.html
In my case, this was: C:\Program Files (x86)\STMicroelectronics\MC_SDK_6.4.1\Documentation\html\md_docs_2_p_w_m___generation.html

Anyways, the short version is that "dead-time" is a fixed hardware value used only for calculations when driving high sides and enables. This is defined in the board .json file as "deadTime". The "SW dead-time" is a configurable value actively written to the timer register when driving both high and low sides. The range available is defined by "minDeadTime" and "deadTime" in the board .json file.