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TPS82670: Getting Higher Output Current

TI-CSC
Genius 15500 points

Part Number: TPS82670
Other Parts Discussed in Thread: LM5146, , LM5169

Hello E2E Experts,

Is there an application note or an already defined design to get higher output current from this step own regulator ?  I need to work on an input of 7 to 100 vdc and keep the output inside 7 to 30 vdc in drop out mode, maximum 3 to 5 amp.



  • 0
    TI__Expert 4010 points

    Hi,

    Thanks for posting your query. This device is designed for up to 600mA of current, above this limit the device would not work normally as the maximum current limit of the device is 1.1A. Therefore for this VIN and Output Current i would suggest to consider LM5146 that fulfills your criteria. I would also loop in the relevant team to guide you further about Wide VIN input devices and TPS82670 is a low VIN device <7V. Please let me know if you have additional questions. I will then forward your case. Slight smile

    Best Regards,
    Zakir

  • 0
    Prodigy 20 points

    Thank you for the suggestion.   I studied the spec sheet of the device and i did not find reference to a Dropout pass-through mode.  But i've find one for a low voltage shutdown.  I need to pass the voltage "as is" from 7 vdc until it reach 45 volts, then regulate it down to 45 volts even if it get as high as 100v.   So i need a pass through mode and a step down mode.  I will read it's specs again...

  • 0 in reply to J-P Belisle
    TI__Expert 4010 points

    Hi J-P Belisle,

    The device you tagged "TPS82670" cannot handle such high VIN and give high Output upto 45V. Seems like you need a buck-boost module which is Wide VIN. I have forwarded your case to Wide VIN team. They will get back to you here asap. Thanks Slight smile

    Best Regards,
    Zakir

  • 0 in reply to J-P Belisle
    TI__Mastermind 40410 points

    Hello JP,

    You have not specified your requirements for pass through.  Typically, there will be some voltage drop when VIN= VOUT, its will not be an ideal pass through we there is always some minimum off-time set on the back converter.  If you need VIN to equal VOUT you will need a buck boost device to maintain the voltage on the output.  

    Here is a buck that may be suitable for your needs.  thanks.

    www.ti.com/.../lm5169.pdf

  • 0 in reply to David Baba
    Prodigy 20 points

     I need to pass the voltage "as is" from 7 vdc until it reach 45 volts, then regulate it down to 40/45 volts max 5 amp even if it get as high as 100v. 

    A small voltage drop is not problematic because the 7v to 30v is a kind of ramp up, the working voltage is around 40v and i want to limit it at 45vdc if it get higher.

    About the LM5169, thank you for the suggestion, but i've read the operation information and i do not locate were it's said that there is a pass through mode or specify a voltage drop...

  • 0 in reply to J-P Belisle
    TI__Mastermind 40410 points

    Hello JP,

    It does not explicitly discuss the drop out performance.  it does provide an example curve of drop out performance though.  see below.

    Hope this helps.

    David.