Part Number: TIDA-00731 Hi,
My guess is 42 Ohms were used. Regardless, wanted to confirm if it’s 2, 12 or 42.
If 42, at 2kV, theoretical peak current is 47A.
The varister is specified as 25A.
Is some sort of averaging used to select that particular…
Hi Bincy,
Thanks for your patience and sorry for the delay.
Bincy VK said: I need one more suggestion for Bust and surge which kind of protection circuit need to add for reducing the common mode noise in EMC
TI digital isolators I/O pins typically are…
Hi Mohammad,
Thank you for reaching out.
Surge transients on the RS-485 bus typically require external protection as you noticed in the THVD1400 datasheet. Please refer to the below reference diagram that describes various methods to protect RS-485 bus…
Part Number: AM26C32 Other Parts Discussed in Thread: AM26C31 , TIDA-01401 , TIDA-060027 , TIDA-00731 , , THVD1400
Hello Community,
We are designing an end-use case using an AM26C31x pair for our data transmission of upto 4Mhz maximum & 500kHz typical. I…
Hi Jim,
Thanks for reaching out.
Please note that the Surge test voltage referred in datasheet especially in the insulation specifications table is the Surge rating of the isolation barrier. i.e., it is the Surge voltage that the isolation barrier of…
Hi Michiaki,
Thanks for reaching out.
The protection diode used on the RS-485 bus is the transient voltage suppressor (TVS) diode. The most commonly used TVS diode for RS-485 bus protection is the SM712 which is delicately designed for RS-485 bus protection…
Hi Hui,
Your understanding of RS-485 being more robust against EFT compared to LVDS is correct but please do note that even RS-485 needs either internal (to device) or external necessary protection to be able to meet required EFT levels. The same explanation…
Ben,
With 100Ohm load, the minimum driver output voltage is 2V. The driver roughly generates 20mA with 1V drop, which means the resistance is about 1V/20mA=50Ohm.
If you're interested in surge protection, you can refer to this TI design.
www.ti.com…
Part Number: ISO1432 Other Parts Discussed in Thread: TIDA-00731 , ISO3088 , ISO3086 , ISO1412DWEVM , SN65HVD82 Dear,
about ISO1432B can support RS-485 and RS-422 at the same time? or have co-lay schematic can share us?
and ISO1432B is could possible can support…
Hello Tachibana-san, all, Schematic and layout reviews are pending. In the meantime I have shared schematic and PCB considerations with Tachibana-san to achieve Class A 4-kV IEC61000-4-4 EFT test pass:
Possible solutions rest on improving the schematic…
