TIDM-BIDIR-400-12: Purpose of External MOSFET Circuit

Gokhan,

Apologies for the delay here, I'm working on getting an answer but need some more time.  Will need to loop in some others.

Considering the age of this reference design, I don't think #3 will happen, but will let others comment.  Please give us another day for a response.

Best,

Matthew

Hi Gokhan,

Gokhan G. said:

In schematic of TIDM-BIDIR-400-12 (tidrhs9.pdf), there is external capacitor charging circuit as below. It is written as active clamping.

which pic are you referring to? I don't see a pic below.

Regards,

Chen

Hi Chen,

Sorry. I added as below.

In which condition, does Q7 and other clamping turn on?

Hi,

Have you taken a look at our latest design below which is PSFB design with active clamping? This should give you more info.

https://www.ti.com/tool/PMP23126

Regards.

Chen

Hi,

Yes, I investigated. I update my questions as below.

1) Do you use that clamping circuit during LV to HV boost topology?

2) If yes, why is there need such a circuit for boost topology?

Thank you.

Hi Gokhan,

Gokhan G. said:

1) Do you use that clamping circuit during LV to HV boost topology?

No, we use it for HV to LV.

Regards,

Chen