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 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…
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…
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…
Hi Lawrence,
RS-485 and RS-422 interface only defines the electrical characteristics of the interface and ISO1432B meets both these requirements. Hence the device can be used either on RS-422 or on RS-485 without any concerns. Please refer to the below…
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…
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…
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…
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…
Rajesh,
I'm afraid SN65HVD32 might not be able to handle 1.25A for 100us. The only integrated surge protection device now we have is SN65LBC184, which can take about 500W surge energy. You can refer to this app note www.ti.com/.../tida-00731 for some…
