TIDM-02008: Current consumption

Hi Danilo,

TIDM-02008 draws less than 1 A for both 5 V and 12 V inputs. However, we observed some issues when the current output was marginal or the margin was not sufficient. More specifically, the power supply operation mode was changed from CV to CC. 

The suggestion in the User's Guide is to provide enough margin to prevent CC mode. It does not have to be 5V/1A, 12V/1A but the power supply should provide enough current for TIDM-02008.

Best,

John

Hi John,

Thank you for your response. The customer would like to know if it is possible to provide the exact current or the maximum current consumption of the 12V and 5V supply of TIDM-02008.

Regards,

Danilo 

Danilo,

I will check my bench set up and get back to you.

Best,

John

The current consumption for 5 V and 12 V P/S is 0.33 A and 0.0026 A respectively. This is just for the steady-state and it may draw more current during the start-up transient.

I guess the customer wants to select the power supply with the lower current rating to reduce the size and cost of the product. I would calculate all the component current consumption for both 12 V and 5 V to get the ballpark number and run the HW while limiting the current in a recursive manner.

Best,

John

Hi John,

According to the customer there is no need to run the HW as it will take much time. He sent a calculation based on the datasheets of the main components and he is confused when he compared with the values you have provided. He requested if you can review the file and adjust the values accordingly. 

Here is the file.

TIDM-02008 Power Calculation .xlsx

Regards,

Danilo

Danilo,

The previous number was from my bench setup while TIDM-02008 was running.

The customer seemed to miss MCU current consumption and that should be the reason for the big difference.

I tested several power suppplies to power-up 5 V and 12 V components and sometimes I had to adjust the current limit around 1 A (typically with low-end power supplies) to power-up the board. So we suggested 1A for 5 V and 12 V in the user's guide. 

Hi John,

The customer previously sent the excel file of the current consumption of the devices and would like to request for the correct values for each components including the MCU.

6114.TIDM-02008 Power Calculation .xlsx

Regards,

Danilo

Let me contact the HW development team and see if they can provide a number for this.

The response may be delayed due to the Thanksgiving holiday.

By the way, does the customer already have the HW? If so, can you check the board revision? 

Best,

John

Hi John,

We have received a feedback from the customer that they don't have an evaluation board yet, but they are going to produce the board using the TIDM-02008 reference design. Please let us know once we have the details of the current consumptions of the devices. Thank you!

Regards,

Danilo

Danilo,

I will let you know once I get feedback from the HW team.

Danilo,

I talked to TIDM-02008 HW engineer and controlCard engineer. They recommended to set power supply to 0.45 A for 5 V and 0.1 A  for 12 V.

Just adding up all the current consumption gives you a ballpark number but it is not an accurate number. Furthermore, some device datasheets do not give you the current consumptions at the specific point.

Also, I am wonder how your customer pick the numbers from datesheets.

For example, the current consumptiuon of the controlCard is actually for F280049C MCU itself . It does not take into account all the component in controlCard. TI does not officially provide current consumption for the controlCard. The power consumption for MCU varies depending on pin configuration as well.

Finally, TIDM-02008 and controlCard is designed for evaluation purpose and it is not for the end-product. E2E support is only limited to the reference design.

Best,

John

Hi John,

Thank you very much for your efforts in this inquiry. We really appreciate your help.

Regards,

Danilo