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SBart.5 · 2024-07-08

We based our circuit on the "STKNX Reference Design" (V1.0, 14. Nov. 2019)).In the case of the single fault condition of a shorted CFH capacitor during operation almost the whole KNX bus voltage (21-30V) is permanently over the 68R resistor (RTX) and...

SBart.5 · 2024-06-13

Hi,during maximum heating tests of our device, we measured a case temperature of +92 °C on the STKNX (on top of the plastic package via thermocouple). The environmental temperature near the STKNX and the PCB was +85 °C.On the borderline, but ok in my...

SBart.5 · 2023-03-06

SBart.5 · 2024-07-08

to 2): What are the allowed tolerances here? (To calculate /select a matching PTC , we have to know.)We use the given circuits according to the "STKNX Reference Design" (V1.0, 14. Nov. 2019)).With RTX = 68 Ohm (>= 1 W power dissipation, 5% tolerance...

SBart.5 · 2024-07-08

Hi AScha.3,thank you for your quick response.To 1):We are using an MLCC, 50 V type. But for these kind of capacitors, as far as i know, a short circuit is a common failure mode ("Low Insulation resistance (IR) or short, along with low or no capacitan...

SBart.5 · 2023-03-06

Thank you for your quick reply, that answers my question. In our case we do not have enough space in the height for an electrolytic capacitor, so we need an alternative.Regards, Sebastian

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STKNX circuit, high power loss at single fault condition: CFH (capacitor) shorted.

STKNX: Is there a value for the maximum case temperature?

STKNX, 100 µF capacitor CVDDHV: Can I use multiple MLCC in parallel instead of one electrolytic capacitor or are there certain characteristics of the electrolytic capacitor that are needed in the circuit? Datasheet "DS12399 - Rev 3 - May 2021", Table 1

Re: STKNX circuit, high power loss at single fault condition: CFH (capacitor) shorted.

Re: STKNX circuit, high power loss at single fault condition: CFH (capacitor) shorted.

Re: STKNX, 100 µF capacitor CVDDHV: Can I use multiple MLCC in parallel instead of one electrolytic capacitor or are there certain characteristics of the electrolytic capacitor that are needed in the circuit? Datasheet "DS12399 - Rev 3 - May 2021", Table 1