Part Number: ISOW7841
My customer is designing for DMX /DALI application for lighting FY2019 model.
Do you have isolated RS-485 with DC/DC converter?
I am offering customer as following .
( I like SN65HVD1781 dut to its high bus voltage )
MCU== ISOW7841==SN65HVD1781===> ( RS-485 line > == termination
My concern is output available load current of ISOW7841.
I think it depends on application. But how do you think?
5V : >130mA 3.3V: >75mA
Do you have any another idea for " RS-485 with DC/DC converter "?
Thanks for bringing this question to E2E!
There is actually a TI Design very similar to what you have proposed. This would probably be the smallest combination solution and the simplest design.
Another option to consider would be an isolated RS-485 transceiver and a discrete isolated DC-DC. See example below with ISO3082 and SN6505.
For an isolated DC-DC you could use a transformer driver like SN6505 and a transformer. The SN6505 can supply 1A with 5V supply, so you'll have plenty of headroom on that supply. You could even power a few other devices.
The downside with this solution is that we do not currently offer an isolated RS-485 transceiver with +/-70V bus-pin fault protection. There are discrete ways of implementing this (a combination of TVS diode and PTC fuse for example could accomplish this).
We also have a few devices with with a built in transformer driver such as ISO3086T. The transformer driver is integrated inside the device, so only an external transformer and (optional) LDO would be needed. This would again not be +/-70V bus-pin fault tolerant, but a discrete solution could be done.
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In reply to Dan Kisling:
Thank you very much for your answer so immediately!!
Its so helpful to start design for customer.
After DIN, I may have futher question .
In reply to Kanji Shibatani:
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