Part Number: TIDA-060027 Hi Team,
The reference design really helps for high voltage over stress protection over RS485 bus lines, but there are several questions, could you please help? Thanks!
1. Is there any theoretical calculation for SIDAC and PTC…
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 Koteshwar,
Thanks for following up. I found a TI whitepaper TIDA-060027 which shows a PTC + SIDAC solution. It looks like it will limit any 120VAC mains voltage that contacts the RS-485 bus. With this solution I don't think I need isolated RS-485 buffers…
Hi Andreas,
Thanks for reaching out.
If a transient exceeding device rating is applied to RS-485 bus, then a TVS diode can be used to suppress the transient and protect device. But a short 24V DC is going to be a continuous event and protection components…
Hi Amelie,
Currently we do not have such a device, although high-voltage short-circuit protection can be implemented externally. An example circuit is given in the below reference design, which was developed for RS-485 but could extend to RS-232 as well…
Hello,
For shorting conditions that fall within the absolute maximum rating of the device pin, no additional protection circuitry should be needed. However, larger currents could flow when the driver outputs are shorted. You should evaluate the power…
Hi Kirwin,
In case it is useful to you, you may want to take a look at this reference design for protecting RS-485 transceivers against high DC voltages:
http://www.ti.com/tool/TIDA-060027
Also note that a simpler solution may be to use a device like…
If you could share a schematic of your usage of the chip it may help. Based on the waveforms, though, it looks to me like there may be increased leakage to ground on pin 6, and this is resulting in the driver having some difficulty in driving a high output…
