TMS570LS3137: Derated Power Consumption

Tam Vu

Part Number: TMS570LS3137

Base on this DS, the max power = 235-0.15*exp(0.174Tjk). I don't see how the power can be higher than 235 ma from this equation. In addition, the power will be less at higher temperature. Please explain.

9 months ago

0 jagadish gundavarapu 9 months ago

TI__Guru 57600 points

Hi Tam,

Please have a look at below similar issue that we got recently and this might be useful for you:

(+) TMS5703135: maximum ICC derating formula - Arm-based microcontrollers - INTERNAL forum - Arm-based microcontrollers - INTERNAL - TI E2E support forums

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Thanks & regards,
Jagadish.

0 Tam Vu 9 months ago in reply to jagadish gundavarapu

Prodigy 50 points

The link that you provide is no longer available.

0 jagadish gundavarapu 9 months ago in reply to Tam Vu

TI__Guru 57600 points

Converted the link into the pdf:

0211.E2E_Thread.pdf

0 Tam Vu 9 months ago in reply to jagadish gundavarapu

Prodigy 50 points

Thanks for sending the .pdf. However, there is no answer to my question. In fact the other person had the same question. I don't see how you get 700 mA max current and even at 25C the equation did not come out as in the datasheet.

0 QJ Wang 9 months ago in reply to Tam Vu

TI__Guru**** 192196 points

The maximum ICC with HCLK=180MHz at 150degree junction-temperature during LBIST is 700mA.

If junction temperature is 25 degree, the Icc = 700 -{ 235 - 0.15e(0.0174*298.15)} = 700 - 57.67 = 642.3 mA

If junction temperature is 150 degree, the Icc = 700 -{ 235 - 0.15e(0.0174*423.15)} = 700 - 0.012 = 699.99 mA

The formula (235 - 0.15*e0.0174TJK) is for derating or subtraction from the maximum current.

0 Tam Vu 9 months ago in reply to QJ Wang

Prodigy 50 points

Thank You.

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TMS570LS3137: Derated Power Consumption