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UCC23513-Q1: continuous current

Ross Parlour
Intellectual 1450 points
Part Number: UCC23513-Q1
Other Parts Discussed in Thread: UCC23513

Tool/software:

Hi, Could you please provide any information on the continuous current capabilities for the UCC23513-Q1?

I’m looking to use some as digital isolators as they have creepage and are cost effective. I could not find an opto with this creepage and isolation. I’m now looking to rationalise and use the FET to switch a few amps, but I only see peak current on the datasheet. I already have this in as a gate driver, but using this as a digital isolator on the same schematic looks to be plausible.

BR, Ross 

  • +1
    TI__Genius 17186 points

    Hi Ross,

    Can you clarify your application that requires a digital isolator to switch a few amps? It sounds more like a load-switch application.

    The UCC23513 and other isolated gate drivers can indeed support continuous output current. It just makes our designers frustrated when they optimize so much for transient behavior.

    There are a few ways to approach the question of how much current they can supply at DC. The safety limiting value is based on the amount of power required to crack the isolation capacitor. It is only 50mA at room temperature, but probably your use case is not a short circuit output.

    The thermal power rating of the device is 750mA. Assuming the current is externally limited, you only need to worry about the Roh and Rol conduction losses, based on I^2*R. If the output is sourcing current, the max safe output current is sqrt(0.750W/9.5)=280mA. If you can design the circuit so that the output will sink current, the current limit is sqrt(0.75/0.04) = 1.3A.

    If you let me know more about what you are trying to do I might be able to take a crack at it. You can pair these gate drivers with output BJT totem pole buffers if you want something non-inverting with higher DC current capabilities.

    Best regards,

    Sean