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Original question:

CCS/TMS320F28035: power consumption

TMS320F28375D: Reduce power consumption

O.H
Mastermind 6480 points
Part Number: TMS320F28375D


Tool/software:

Hi experts,

My customer is trying to create a PFC power supply using the TMS320F2837xD, but is having issues with power consumption.

Q1: Are there any other ways to reduce power consumption besides the following?
・Change internal 1.2V generation from LDO to DCDC
・Set unused GPIO pins to output, disable internal pull-up, and disconnect external resistors
・Stop unused peripheral clocks
The measured microcontroller power consumption after these measures is about 0.45W.

The use of Low-Power Modes is not possible because they are considering reducing power consumption while the CPU is running.
They plan to consider "Flash is powered down" in the future.

When they ran a board similar to the PFC implemented in C2000 using the STM32G474QET6, the power consumption on the datasheet was about 0.1W, and the actual microcontroller temperature rise was lower than that of the C2000.
They would like to be able to reduce power to this level even with the C2000.

Best regards,
O.H

  • 0
    Mastermind 6480 points

    Hi experts,

    Is there any update?

    Best regards,
    O.H

  • 0
    Mastermind 6480 points

    Hi experts,

    When the customer performed additional testing, the following method was found to have a significant effect on reducing power:
    - Changing unused GPIO pins from output mode to input mode (with external pull-down resistor, internal pull-up disabled)

    By making the above changes, power consumption was reduced by about half.

    The GPIO settings before the change were output mode (no external connection, internal pull-up disabled), but both methods seem to be recommended in the hardware manual. (See table below)

    Q2:Could you tell me about the cause of the above? It would also be helpful if you could tell me about similar cases.

    Best regards,
    O.H

  • 0 in reply to O.H
    TI__Expert 7100 points

    Hello,

    Thanks for your patience.

    I will provide you the explanation why changing GPIO mode to input mode reduces the power. Meanwhile, All the recommendation for reducing the power consumption is given in section "6.5.3 Reducing Current Consumption" in datasheet.

    Regards,

    Hadi

  • 0 in reply to Hadi Moradisizkoohi
    Mastermind 6480 points

    Hello Hadi,

    Thank you for your support, and sorry for late reply.

    Hadi Moradisizkoohi said:
    I will provide you the explanation why changing GPIO mode to input mode reduces the power.

    Is there any update?

    Hadi Moradisizkoohi said:
    Meanwhile, All the recommendation for reducing the power consumption is given in section "6.5.3 Reducing Current Consumption" in datasheet.

    I checked and understood that the rest is just to power down of Flash.

    Best regards,
    O.H

  • 0 in reply to Hadi Moradisizkoohi
    Mastermind 6480 points

    Hello,

    Sorry for rush you. Is there any update?

    Best regards,
    O.H