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TIDA-00233: Need guidance to use as reverse power protection with Keithley Power supply with 30V, 6A

Jaydeep Parmar
Prodigy 10 points
Part Number: TIDA-00233
Other Parts Discussed in Thread: LM5069

Can we use this Part TIDA-00233 to Power supply channel of 30V,6A from reverse power??

We also have other application, that we need to control power supply voltage with analog input with resolution of 1mV. Can we achieve this resolution with mentioned protection modual??  

  • 0
    TI__Prodigy 550 points

    Dear Sirs, 

    This module is a multi-purpose protection device with electronic fuse function, over- and undervoltage protection, reverse voltage blocking, surge disconnect and reverse current protection with fixed setting of maximum current combined with an inrush current limit. It is designed around an LM5069.

    It is not a voltage regulator.

    In the example schematics it is set to 10A but with a different set of sense resistors you could achieve smaller current limits with the same layout and no external cooling. The 10A will trigger a disconnect after a fault timer expired which is programmable through a capacitor C2 in the schematics. It also limits the maximum power in the MOSFET (SOA protection) programmed via R5 in the schematics. If the current is more than twice of the maximum value (20A) then the device does an instant shut-down withing typically 500ns. 

    Reverse voltage protection is implemented by diodes by D2 and D3. Reverse current protection is implemented with a smart diode based on the LM5050.

    Surge voltage limit is done through two TVS diodes, one on input and one on output. During a surge the input current gets so high that the TVS will still let some 56V slip through. This voltage will creat a large current flow into the output diode which triggers the electronic fuse instantly thus limiting the surge voltage at the output to below 40V. This is OK for most electronics designed for abs max less than 48V.

    So long story short: the device protects the load from power supply faults of any kind and prevents current back flow when there is an input short or if the load tries to feed voltage into the power supply. It does however not regulate the voltage. 

    Kind regards, Ingolf

  • 0 in reply to Ingolf Frank
    Prodigy 10 points

    Sir,

    As mentioned in my question.

    We need to achieve 1mV resolution.

    If we set 1 mV in power supply, can it pass through this mentioned module???

  • 0 in reply to Jaydeep Parmar
    TI__Prodigy 550 points

    Dear Jaydeep, 

    The module is designed to disconnect the load at V_in < 11.4V and reconnect at V_in > 12.4V (see guide page 3, specifications). It could be changed to work down to 9V but that's it without further modification. Above that it behaves similar to a normal fuse. It has some resistance along the path. This resistance as the module is designed in this case is about total 10mOhm so you get a 100mV drop at 10A.

    If you want to use a fuse at the output of a power supply you would need the feedback loop signal for the regulator from the output connector or even with a return wire directly from your load (separate sense input voltage). Otherwise a 1mV at 6A could not travel that far. Even in the wire you lose more.

    For your special case I think you need a 12V negative gound potential for the protection circuit and disable the over- and under-voltage protection. Then it should be able to work down to zero volt (assuming you take the voltage feedback from the output to compensate for the drop).

    Regards, Ingolf