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Original question:

TPS2546: TPS2546 CDP & DCP Auto application

TPS2546: DCP mode over current thermal cycle concern

Kelvin Tee
Genius 10035 points
Part Number: TPS2546

Hi 

Notice from datasheet Fig 21 TPS2546 went into thermal cycle when the Ilimit was set to 2.5A and short circuit was performed.

If configure DCP mode and Ilimit set to 1.8A and 1.5A in a phone charging environment. Could you share the test result for both limit threshold when current limit kicks in? Would it trigger thermal cycle ?

Engineer is concern on the thermal cycle and like to ask if it violate the USB compliance ? 

Is there any workaround in such situation?

Rgds
Kelvin

  • 0
    TI__Mastermind 30000 points

    Hello Kelvin,

    I do not have this data available, but I do not think it is needed. There is a tolerance window for the current limit, which can be calculated using the Ios_min and Ios_max equations from the datasheet. As long as the current limit does not enter into this threshold, then the design should be fine. Do not think there should be any concern from a USB compliance perspective

  • 0 in reply to Adam Mc Gaffin
    TI__Genius 10035 points

    Hi Adam

    Noted the Ilimit window. Customer likes to understand by setting the limit to 1.8A and 1.5A, will the device trigger the thermal protection when it runs at the over current limit?

    Customer has yet built the board nor measure on the EVM but like to understand the thermal constraint of this device. This data is critical for device selection.

    Rgds
    Kelvin

  • 0 in reply to Kelvin Tee
    TI__Mastermind 30000 points

    It depends on how much current the TPS2546 is trying to regulate. In a hard short, yes it will thermal cycle. If the system is trying to pull 1.85A and the limit is 1.8A, will the TPS2546 go into thermal protection? probably not