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RoadTest Forum Can you safely review this Digital Isolator?
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Forum Thread Details
  • Replies 15 replies
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  • RoadTest
  • digital isolator
  • toshiba
Related

Can you safely review this Digital Isolator?

OwainM
OwainM 4 days ago

Hey everyone,

I'm trying to work out how suitable the Toshiba DCM340L01  is for a RoadTest and would appreciate your input.

Reading through the datasheet it seems quite interesting, but due to the voltage it claims to be able to insulate from (5000Vrms), I'm not sure what equipment is required to put it through its paces.

What additional equipment might you need for a RoadTest?



Rather than just the IC alone, the chip is provided on a break-out board, as shown below.
image

The following documentation for the chip is provided from the manufacturer:

  • Manufacturer’s Page
  • Selection Guide 

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Top Replies

  • gpolder
    gpolder 4 days ago +3
    I would assume the isolation voltage meets the specification and focus instead on testing the data rate, presenting both input and output waveforms. A 5000 V isolation tester costs several thousand euros…
  • michaelkellett
    michaelkellett 4 days ago +2
    It's not a very good candidate for a road test. I use isolators in many designs and buy them from reputable suppliers. usually TI or Analog Devices, but sometimes others, including Vishay and Toshiba…
  • robogary
    robogary 4 days ago +2
    The Road Test is not really meant as a substitute for the suppliers QA testing, is it ? The voltage stress could be checked with a megger, I would expect few folks to have access to a hi-pot. Id be interested…
Parents
  • rcreighton
    rcreighton 4 days ago

    I picked up a low cost ($60 USD) megger that had switchable test voltages up to 5000V at a previous job. If a roadtest for the digital isolator included a megger like that for testing, then I could see it being interesting. 

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  • rcreighton
    rcreighton 4 days ago

    I picked up a low cost ($60 USD) megger that had switchable test voltages up to 5000V at a previous job. If a roadtest for the digital isolator included a megger like that for testing, then I could see it being interesting. 

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  • kmikemoo
    kmikemoo 3 days ago in reply to rcreighton

    Ah, the Megger.  After working in the power industry for almost 40 years, I think the megger gets way more credit than it deserves.  As a DC device, it can create the illusion that the insulation system is better than it really is - for AC applications.  And yet we use it on AC systems all the time.  It essentially measures the very best layer of insulation.  It can confirm if the insulation system is failed but it cannot tell you that the insulation is good for AC systems.
    Okay... I'll give you that it's better than nothing AND it's more affordable and less dangerous that an AC Hi-Pot.  Still, know that it's not as cool as it will tell you it is.

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