AN5861 - Power rating for R4 (8R2)

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

Power

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Peter BENSCHBest answer

ST Technical Moderator

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

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

Peter BENSCHBest answer

ST Technical Moderator

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

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

A

alwAuthor

Senior

Hi Peter,

Thanks very much.

Kind regards,

Al

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