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TPS92643-Q1: CSP-CSN

Ivy Jin
Intellectual 2815 points
Part Number: TPS92643-Q1

Tool/software:

Hi  team,

My customer would like to do the short circuit test (Short the SW output to the Power), below is their questions, could you please help check? Thanks.

1. Could you please check the Max value of V(CSP-CSN)?

2. Could you provide the specs for CSP and CSN internal clamp diodes?

3.Can the UDIM pin be connected directly to the VIN via a resistor without resistance division? 

Regards,

Ivy

  • 0
    Prodigy 186 points

    Hi!

    Here is the test result for shortening SW side to Power , as shown in the excel./cfs-file/__key/communityserver-discussions-components-files/196/Short-the-SW-side-to-Power.xls

  • 0
    TI__Mastermind 18735 points

    Hello Ivy,

    1)  and 3) are clearly shown in the datasheet. So yes you can tie UDIM directly to Vin or you could tie it to Vcc as an alternative.  Why don't they want to use the UVLO feature?  Is it just cost?

    2.  We do not have detailed specifications.  As long as the voltages are met when using the external schottky diode then that means it is fine. You need to select that schottky so that it appropriately bypasses the internal diode during the fault condition such that you don't violate abs max of those pins.  

  • 0 in reply to fhoude
    Prodigy 186 points

    Hi fhoude,

    The maxium V(CSP-CSN) is 3mV in the spec , is this right ? In my application, Rcs=50mR Iout=2A@max.,which means normal V(CSP-CSN) is 100mV much bigger than 3mV .

    Check the table I uploaded , we can find that when it comes to shorten the SW to Power , the max V(CSP-CSN) reaches 1.1V and -2V , would this do damage to the internal clamp diodes ? 

    UVLO I have played it well

  • 0 in reply to fhoude
    TI__Intellectual 2815 points

    Hi Fhoude,

    Thanks for your comments.

    I would like to double check one spec with you. According the datasheet, the absolute maximum value of V(CSP-CSN) is -0.3 to 0.3mV, but the recommended operating conditions of V(CSP-CSN) is >8mV, is it a typo?  Or my understanding is wrong? Theoretically, the recommended range should be smaller than the absolute range. Thanks.

    Regards,

    Ivy