• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 189 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS73801-SEP: Single-Event Transient Levels and Durations

Paul Thompson
Prodigy 80 points
Part Number: TPS73801-SEP

I've been looking at SLAK024 (TPS73801-SEP Single-Event Effects (SEE) Test Report) and the document appears incomplete - it references plots of the SETs observed but doesn't actually include them in the document.

I'm trying to design this component into a circuit, but the challenge I have is mitigating the SET as a transient above ~5% will destroy the parts it is supplying without any mitigation.

However, this report gives no visibility on what the transients are that need to be mitigated. More than 5% could be 7% or it could be 50%. Duration is also a concern - it would be easy to filter out a 1 ns transient but much harder if it's 10 ms for example.

  • 0
    TI__Guru 62930 points

    Paul,

    I can help with this.   This was a known deficiency with the report, that was in queue to be updated.  I am checking with the team to insure it is still on the list.

    However, I can provide some of the missing details.

    Run 10 had 7 events that exceeded the 5% threshold.

    Here are plots of those 7.

    166

    336

    407

    583

    68

    875

    944

    Negative going

    122

    255

    283

    Additionally, the nominal value used to determine threshold limits was 2.52.  However, analysis of the plots and data show the true nominal value to be 2.533V.

    The following table represents the positive going trip threshold levels and the number of events along with comparison of number events using the original nominal of 2.515 vs the updated 2.533 nominal Vout value.   Based on this, none of the events exceed the 5% level with worst case of 4.5%

    The nominal values were determined from plots with pre-event values examined.

    Old

    2.52V

    New

    2.533 V

    + level

    events

    2.52

    2.533

    2.594

    1160

    2.94%

    2.41%

    2.595

    1142

    2.98%

    2.45%

    2.596

    1142

    3.02%

    2.49%

    2.597

    1142

    3.06%

    2.53%

    2.598

    1142

    3.10%

    2.57%

    2.599

    1142

    3.13%

    2.61%

    2.6

    1142

    3.17%

    2.65%

    2.601

    1142

    3.21%

    2.68%

    2.602

    1142

    3.25%

    2.72%

    2.603

    1142

    3.29%

    2.76%

    2.604

    902

    3.33%

    2.80%

    2.605

    902

    3.37%

    2.84%

    2.606

    902

    3.41%

    2.88%

    2.607

    902

    3.45%

    2.92%

    2.608

    902

    3.49%

    2.96%

    2.609

    902

    3.53%

    3.00%

    2.61

    902

    3.57%

    3.04%

    2.611

    902

    3.61%

    3.08%

    2.612

    902

    3.65%

    3.12%

    2.613

    558

    3.69%

    3.16%

    2.614

    558

    3.73%

    3.20%

    2.615

    558

    3.77%

    3.24%

    2.616

    558

    3.81%

    3.28%

    2.617

    558

    3.85%

    3.32%

    2.618

    558

    3.89%

    3.36%

    2.619

    558

    3.93%

    3.40%

    2.62

    558

    3.97%

    3.43%

    2.621

    113

    4.01%

    3.47%

    2.622

    113

    4.05%

    3.51%

    2.623

    113

    4.09%

    3.55%

    2.624

    113

    4.13%

    3.59%

    2.625

    113

    4.17%

    3.63%

    2.626

    113

    4.21%

    3.67%

    2.627

    113

    4.25%

    3.71%

    2.628

    113

    4.29%

    3.75%

    2.629

    113

    4.33%

    3.79%

    2.63

    37

    4.37%

    3.83%

    2.631

    37

    4.40%

    3.87%

    2.632

    37

    4.44%

    3.91%

    2.633

    37

    4.48%

    3.95%

    2.634

    37

    4.52%

    3.99%

    2.635

    37

    4.56%

    4.03%

    2.636

    37

    4.60%

    4.07%

    2.637

    37

    4.64%

    4.11%

    2.638

    37

    4.68%

    4.15%

    2.639

    7

    4.72%

    4.18%

    2.64

    7

    4.76%

    4.22%

    2.641

    7

    4.80%

    4.26%

    2.642

    7

    4.84%

    4.30%

    2.643

    7

    4.88%

    4.34%

    2.644

    7

    4.92%

    4.38%

    2.645

    7

    4.96%

    4.42%

    2.646

    7

    5.00%

    4.46%

    2.647

    7

    5.04%

    4.50%

    If this answers your question, please click this resolved my question.
    Regards,
    Wade

  • 0 in reply to Wade Vonbergen
    Prodigy 80 points

    Thank you for the response. Is the peak transient level a function of the output voltage or does it tend to be a constant level regardless of input or output voltages? Expecting to use the device with a lower output voltage than those tested.

    Thanks in advance.

    Paul

  • 0 in reply to Paul Thompson
    TI__Guru 62930 points

    Paul,

    I do not have specific SEE data for lower Vout conditions.   However, there is some evidence that the transient magnitudes will stay about the same, or possibly slightly smaller with lower Vout.  Thus, you can keep the same transient magnitude, and scale it to your Vout.  This should be a conservative approach since the existing data is relatively low voltage.

    Using the worst case 7 events, this shows up between 106mV to 114mV of positive transient.

    Using worst case of overshoot range of 106 to 114mV and apply to 1.8V Vout for example would have an estimated worst case overshoot range of 5.9 to 6.3% 

    The 106, and 114mV come from the bin range for the 7 worst case events shown above.

    One word of caution though.  If you have a larger headroom (Vi > Vo), then this could increase the transient behavior.  The dataset in the report has a headroom of 700mV.

    Hopefully this helps.

    Regards,

    Wade