HOW TO CALCULATE THE POWER DISSIPATION IN AN IC

shijesh ak

Other Parts Discussed in Thread: TMS320F28335

I am carrying out the thermal analysis of my card and I am really interested in finding out the power dissipated by the different IC's I use (mostly TI). In this regard I am looking for some help.

first of all I am not that sure as to how to precisely calculate the power dissipated by an IC for say the buffer SN74LVC244APW. I have used it to pass my data bus through and connect the DSP to the UART.

I am aware that the static power consumed by the IC will be equated to Vcc times the current Icc + delta Icc, but I don't know how to account for the dynamic part of the dissipation into. Here I request somebody to guide me by sending some relevant literature or connecting me to the concerned engineer @ TI.

Regards

SHIJESH

over 9 years ago

0 Gautam Iyer over 9 years ago

Guru 192875 points

Hi,

Which C2000 mcu are you working on/ plan to work?

Regards,
Gautam

0 shijesh ak over 9 years ago in reply to Gautam Iyer

Prodigy 150 points

Hi,

I am using the TMS320f28335 DSP. Actually i have made a customised card using the same.

Regards

Shijesh

0 Gautam Iyer over 9 years ago in reply to shijesh ak

Guru 192875 points

Shijesh, you can refer Section (6.4 Current Consumption ) onwards to get an idea. As for the precise or exact values you'll need instruments.

Regards,
Gautam

0 Daniel Wulff over 9 years ago

Prodigy 60 points

This may also be helpful: www.ti.com/.../spra953b.pdf
Titled: "Semiconductor and IC Package Thermal Metrics" it gives some insight on how power is dissipated as heat as for the amount of power being dissipated, you'll just need some decent test equipment to get a good grasp on where specifically the power is going. (thermal cameras can be really useful in guesstimating the amount of power exiting different components)

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HOW TO CALCULATE THE POWER DISSIPATION IN AN IC