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LMH13000: Duty cycle

Nitzan Shadmi
Prodigy 10 points
Part Number: LMH13000

Tool/software:

Hi,

I am looking for a current supplier with an output of at least 120 mA (an minimal current of around 1 mA), up to 15 V output and1 usec pulse width that is either programable (able to give a specific duty cycle) or able to receive an external trigger (with resolution of at least 10 KHz). Is the LMH13000 driver suitable for my needs?

  • 0
    TI__Intellectual 2650 points

    Hey Nitzan,

    Are you looking for sinking current or sourcing current or both? Controlling the current below 30mA on LMH13000 will not be very accurate but for current above that it should be fine? 

    Can you also tell for what appplication for you lokking this device for? We can help you better if you can give some more detail on this

    Regards

    Anant

  • 0 in reply to Anant Sinha
    TI__Expert 3946 points

     Can you look into generating 1mA pulse using Constant bias pin since the required pulse width is only 1us.

    Attached is some material for the same.

  • 0 in reply to Anant Sinha
    Prodigy 10 points

    Hi Anant, 

    I apologize fr not replying earlier, there is some technical issue with posting here. I need to apply positive current from the driver to my load, which is a VCSEL. So that would be sourcing current, right? We plan to use the driver in our VCSEL probe station for testing devices. 

    While we do need currents lower than 30 mA, we can handle them being less accurate, assuming the pulse is relatively stable.

    If there is anymore information you require, please let me know.

     

    Best regards,

    Nitzan

  • 0 in reply to Nitzan Shadmi
    TI__Intellectual 2650 points

    Hi Nitzan,

    Sorry for delay in response. The LMH13000 cannot source current it can only sink current. If that is ok, it can be done using RBIAS pin. LMH13000 cannot set current of 1mA from VSET pin, but we can do it in two other ways if the pulse frequency/rise is not very fast like in your use case

    1. setting the current using the RBIAS and pulsing it by enabling and disabling it using PD pin as explaing be Shreenidhi in the previous comment

    2.Using RBIAS resistor and giving pulse input at V_Rbias (other side of the RBIAS pin) as show below

     

     here Rbisa=5K

    Regards

    Anant