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8Vout from lmz23608

Jaden Ghylin102047
Expert 1140 points

What is the risk of running this part at 8V output?  Is the part susceptible to failure?  Is the compensation scheme prone to instability at voltages above 6V?  We have a board running at 8V now and seems to be fine.  

  • 0
    TI__Genius 10095 points

    The risks are low, but of course the operation is not guaranteed by the datasheet. 

    Risk one.  There will be an increase in the internal Peak to Peak inductor current.  This can decrease the peak current that the part will supply.  It will also increase the output voltage ripple.

    Risk two.  There is a clamp on the internal comparison to FB.  Observed for this part, if run at 12 Vout, the clamp was triggered well before full load current.

    Risk to Compensation:  At 8 vout the compensation for the part should be stable based upon the guidlines set forth in the datasheet.  However transient response will suffer because the crossover frequency will decrease.  A feed forward cap will probably be needed to increase the crossover frequency and improve transient response.

     

    Regards,

    Marc