Other Parts Discussed in Thread: TIDA-010034
Hi technical support team
I've a further question belonging the design with the TPS23755
The design guide: TIDA-010034 explains well the steps required for the component selection.
The according schmatic design "TIDA-010034 from 2/3/2019 on page 3 depicts an option for connecting components sot the supply pin VDD.
The optional components - diode and capacitor - are suggested for Low Temperature Conditions fro applications workting near -10°C and less.
My design has to operate properly until near -30°C. So as I understand the explanation written in the TPS23755 datasheet (chapter 8.2.2.20 - Shutdown at Low Temperatures, DVDD and CVDD) these two components are required to eliminate the extra switching cycles during removal of the PoE input.
My questions:
- What will happen without these two components during removal of the PoE input?
- How is the behavior of the design affected without these two components during shutdown at low temperature?
- You only write in the datasheet that "It is acceptable for most applications" but as I understand there can not be a guaranteed monotonic shutdown of the output voltage.
- Is it possible that the output voltage of the flyback converter rises once again during the sloping condition?
- Is it correct that in case when I populate these two components (diode and capacitor) for the VDD pin that the capacitor is connected with PGND and not with VSS?
Best regards
Hans