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CSD17559Q / Transient Thermal Impedance & VSD variation

S.Satoshi
Guru 21675 points

Hi Team,

Our customer is asking following two questions. I'd like to discuss about them but these information should not be disclosed on E2E, so please contact me directly if you can. Then I'll let you know about the detailed information of this business.

1, Non-linear transient thermal impedance

Our customer found that the transient thermal impedance of CSD17559Q does not show linear curve compared with competitors as attached. Please give your comments if you know any reason from technical view. 

 

2, VSD variation

We know that CSD17559Q has VSD as 0.8V(typ) and 1V(max) stated in electrical characteristics. But now our customer is requesting us to disclose variation data for their information. Can you prepare it?

 

 

Best Regards,

Sonoki / Japan Disty 

CSD17559Q5 transient thermal impedance.pdf
  • 0
    TI__Mastermind 18200 points

    Sonoki - san, 

    It looks to me like our curve is very close to the competitors. One thing is we only measure once every order of magnitude (1us, 10us, 100us, 1ms ...etc) so this may be why their curve appears to be more smooth, but I don't believe they are more linear. Their curve tends downward as it approaches the lower time values just like ours does. I would guess they either take more measurements or use some sort of interpolation/smoothing technique. 

    As for Vsd voltage drop, I can tell you that the distribution is very tight around 0.8V and it will probably never come close to 1V. For the specific data and more information on this opportunity, please contact me directly. 

    b-barr@ti.com

    Also, please loop in Kevin O'Connell, PME for this product, and Chris Bull, head of marketing for all NexFET devices. 

    koconnell@ti.com

    cbull@ti.com

    Thanks