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Original question:

TIDA-01292: Looking for the test firmware source code & Altium project files of TIDA-01292.

TIDA-01292: Gate Driver LM5101BMA query

Vaibhav Chavan74
Prodigy 110 points
Part Number: TIDA-01292
Other Parts Discussed in Thread: TMS320F28027, , LM5101B, LM5101, LM5100A, LM5101A

Hi Team,

This is with reference to the inverter design reference file of TIDA-01292. The gate driver part number is LM5101BMA & the input PWM signal to gate driver is from TMS320F28027 LaunchPad. 

The input threshold voltage level of LM5101B is 4.5V(min) to 6.3V(max) . The launchpad VCC is 3.3V, then how your are meeting the requirement of threshold voltage for input signals of gate driver? 

Are you using any buffer/level shifter on LaunchPad to convert 3.3V PWM signal to 6.3V level? 

Thanks,

Vaibhav

  • 0
    TI__Mastermind 20950 points

    Hello Vaibhav,

    Thank you for the interest in the LM5101B and the TI reference design ITDA-01292. Looking at the datasheet table, the LM5100A/B/C input thresholds are as you mention with 4.5V Min to 6.3V Max with VDD=12V. The LM5101B which is in the TI reference design is 1.3V Min to 2.3V Max for the input rising threshold. The LM5100 family is CMOS input thresholds and the LM5101 family is the TTL compatible thresholds. So this driver is compatible with the 3.3V input signals.

    The A/B/C suffix determines the driver current of 3A/2A/1A.

    Please confirm if this addresses your questions, or you can post additional questions on this thread.

    Regards,

    Richard Herring

  • 0 in reply to Richard Herring
    Prodigy 110 points

    Hi Richard,

    Thanks for the update. I had done the simulation using LM5100 PSpice model, in which the gate driver is not working with 3.3V input signal. I missed to read the threshold voltages of LM5101 family. Thanks for your information. 

  • 0 in reply to Vaibhav Chavan74
    TI__Mastermind 20950 points

    Hello Viabhav,

    If you are running simulations, you can find the simulation models in the LM5101A product folder which should have the TTL compatible inputs.

    Please confirm if this addresses your question, or you can post additional questions on this thread.

    Regards,

    Richard Herring