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ISO5852S: Desat Chart seem to have wrong units

mahmood akbar
Prodigy 20 points
Part Number: ISO5852S

Datasheet has wrong chart apparently :

Fig 33 should be 90% Dsat Drop  , units seem to be ok 

Fig 34 should be 10% , Desat Drop , units should be nsec , not useconds

part number is ISO5852S

  • 0
    TI__Expert 4875 points

    Hello Mahmood,

    The units for tds(10%) is correct; this is in microseconds. The protection feature enables soft turn off when DESAT is detected to pull OUTL low slowly in order to safely shut down the power switch. The pulldown current is approximately 130mA and the load is 10nF. Thus, the timing of shutdown is approximately based on t_shutdown=C*dv/i = (10nF)*(15V-(-8V))/(130mA) = ~2 us.

    This detail is also explained in Section 9.3.4 Soft Turnoff, Fault (FLT) and Reset (RST).

    Thank you, 

    Audrey

  • 0 in reply to Audrey Dearien7
    Prodigy 20 points

    Hi Audrey 

     i agree with you timing for

    full shutdown (90% discharge )  is approx 2usecl

    For Partial Discharge (10% )  should be roughly 500nseconds 

    Fig 33 shows graph for 10% discharge and it mentions it to be 2usec 

    Fig 34 shows graph for 90% discharge and it mentions 550usecond  not nanoseconds

  • 0 in reply to mahmood akbar
    TI__Expert 4875 points

    Hello Mahmood,

    Yes, in Figure 34 there is a typo. The units should be 'ns' as is given in the Switching Characteristics table. Thank you for pointing out the error.

    Regards,

    Audrey