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TIOS1013: residual voltage equation

Nam, Dino
Expert 5825 points
Part Number: TIOS1013
Other Parts Discussed in Thread: TIOS101

Dear team, 

We can see residual voltage per current like below on datasheet. 

But the customer want to know residual voltage under 50mA. Is there any equation to calculate the residual voltage per current? 

At datasheet 7 page, there is graph for residual voltage like below but That graph shows only approximations. the customer want to know exact value. Is it possible? 

Please let me know your opinion. 

Thank you. 

  • 0
    TI__Guru 61042 points

    Dino,

    Thanks for posting this to E2E. We will get a response to you by the end of the day tomorrow CST.

    Regards,

    Eric Hackett

  • 0
    TI__Mastermind 23195 points

    Dino,

    The values that you included above from the data sheet for the TIOS101 represent maximum values. This means that for a particular device, the VDS(ON) seen at (for example) I = 200 mA will be no more than 1.5 V. Between devices, there is variation. For this current draw, one device could have a VDS(ON) of 1.5 V while another could have a VDS(ON) of 1.25 V. Both would be considered normal operation.

    Thus, the graph you showed should be used as you described - it is an approximation of the residual voltage at different load currents. It would be improper to try to determine the "exact value" of the residual voltage at a particular current draw due to the nature of variation between devices.

    That being said, the maximum value provided for these current draws in the data sheet graph you showed are relatively close to the values an engineer would expect to see in application. For current draws below 50 mA, you'd expect to see residual voltage approximately equal to or below the values shown in Figure 6-2 above.

    Thanks,

    Danny

  • 0 in reply to Danny Bacic
    TI__Expert 5825 points

    Hi Danny, 

    I understood your meaning there is variation between devices. 

    We can know (for example) VDS max 1.5V at 200mA through datasheet table. but I can't know VDS max is 0.85V or 0.9V or 0.95V at 50mA through Figure 6-2 above.

    so I requested equation to calculate the residual voltage per current, If there is no equation, Is there more detailed table or graph than the datasheet that shows max residual voltage in a particular current? 

    Please review it again and let me know your opinion. 

     Thank you. 

  • +1 in reply to Nam, Dino
    TI__Mastermind 23195 points

    Dino,

    Unfortunately we don't have this, otherwise we would likely have included it on the data sheet. Based on Figure 6-2 it looks like you can assume 0.9 V around 50 mA, though it varies with temperature as shown in the plot.

    For this I'd usually expect the max to be above the typical value by approximately 10% to 15% or so. Thus I would assume approximately 1 V as the maximum for 50 mA load current.

    Best,

    Danny