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TLV767: Fast transient input

Michiaki Tanii
Expert 4610 points
Part Number: TLV767

Hi Team,

 

Could you kindly advise on the below figure13, 14 ?

For instance, if the input condition was figure13, would the output voltage would regulated voltage plus AC coupled voltage ?

 

And if fast transient was inputted, will the output voltage be over than regulated voltage ?

(If TLV76750 is used, will output voltage be more than 5V at fast transient input.)

 

Thank you and best regards,

Michiaki

 

  • 0
    TI__Guru 50190 points

    Hi Michiaki,

    These graphs were produced with the TPS76701 with VOUT set to 3.3V. The red trace (VOUT) shows the instantaneous rise in the output due to the input deviation., So the answer to your question is yes, you would add this to the regulated voltage. These graphs were made using only 1uF of capacitance at the output so increasing COUT or slowing the slew rate of the input would both minimize this effect. The slew rate impact is easily seen with comparing figures 13 and 14. 

    For question #2, yes, but if you zoom into figure 13, this is only for 10's of microseconds and can be easily mitigated by increasing COUT. Note: 0.6uV/s is a very fast slew rate. 

    I hope this answers your question.