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alw
Senior
January 20, 2025
Solved

AN5861 - Power rating for R4 (8R2)

  • January 20, 2025
  • 2 replies
  • 1260 views

Is there a recommended minimum SMT package size and power rating for resistor R4 (8R2) please?

Best answer by Peter BENSCH

R4 is only connected to GND by Q1 for a very short time, defined by the monoflop U1 with R3/C3, so that the heating of R4 is almost negligible depending on its dimensioning. With the approx. 0.4ms (100k, 5.6nF) from AN5861, a resistor size of 0805 is certainly sufficient.

Hope that helps?

Regards
/Peter

2 replies

Peter BENSCH
Peter BENSCHAnswer
Technical Moderator
January 20, 2025

R4 is only connected to GND by Q1 for a very short time, defined by the monoflop U1 with R3/C3, so that the heating of R4 is almost negligible depending on its dimensioning. With the approx. 0.4ms (100k, 5.6nF) from AN5861, a resistor size of 0805 is certainly sufficient.

Hope that helps?

Regards
/Peter

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    A
    alwAuthor
    Senior
    January 20, 2025

    Hi Peter,

    Thanks very much.

    Kind regards,

    Al

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