How to do 85V Fail-safe in THVD1550

kirwin kang

Prodigy 10 points

Other Parts Discussed in Thread: THVD1550, THVD2450

over 4 years ago

0 Hao L over 4 years ago

TI__Mastermind 25705 points

Kirwin,

Do you mean you want to protect THVD1550 from a 85V voltage? What's the duration of the voltage? Does the voltage show up on the bus?

Regards,

Hao

0 Max Robertson over 4 years ago in reply to Hao L

TI__Guru 62910 points

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 THVD2450, which is similar in performance to THVD1550 but able to withstand +/- 70 V without requiring this external protection circuit.

Please let us know if you have further questions.

Regards,
Max

Isolation

Isolation forum

How to do 85V Fail-safe in THVD1550