LM5145: When TI FET CSD19534Q5A is used with LM5145, is there any shoot through problem?

Hi Tim,

Thank you for the prompt reply and your FET recommendation.

Regarding LM5145 adaptive dead-time control, if a FET which has bigger proparation delay difference between turning on and off is used, is the dead time changed to longer than 14ns (typical dead time of LM5145) by adaptive dead-time control function?

Also do you have any document which explains adaptive dead-time control in detail?

Thank you again and best regards,
Kazuya Nakai.

Hi Tim,

According to LM5145 datasheet(SNVSAI4), HO turnon dead time and LO turnon dead time are both 14ns. Do you mean that this 14ns is changed by ADAPTIVE DEADTIME DELAY circuit depnding on NMOSFET?

Best regards,
Kazuya Nakai.

Hi Tim,

Could I ask you again that CSD19534Q5A can be used with LM5145 without no shoot through problem, can't it?

Thank you and best regards,
Kazuya Nakai.

Hi Tim,

Could you please take a look the attached excel file?

The customer worries about the shoot through at the timing shown in the file.

Is it no problem because Adaptive Dead-Time Control changes LM5145 HO/LO dead time longer than 14ns?

Thank you very much and best regards,

Kazuya Nakai.

/cfs-file/__key/communityserver-discussions-components-files/196/LM5145-with-CSD19534Q5A_5F00_Shoot-through_5F00_012819.xlsx

Hi Tim,

I know you are very busy but could you please give me your comment for the dead time question?

Is the dead time extended from 14ns automatically by the adaptive dead-time control of LM5145 in CSD19534Q5A using case?
The customer is evaluating LM5145 with CSD19534Q5A and they didn't observed any shoot through in their evaluation. But they worry about shoot through problem after production start because they don't know how the adaptive dead-time control works.

Your comment will be helpful for them.

Thank you and best regards,
Kazuya Nakai.