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Using Digital isolators instead of Opticouplers
Using Digital isolators instead of Opticouplers
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Old 5th July 2008, 01:28 AM   #1
TechGuy is offline TechGuy  United States
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Join Date: Apr 2006
Location: Connecticut
Default Using Digital isolators instead of Opticouplers

Has anyone ever used Digital isolators in SMPS design? The big advantage I see is the much higher switching speed, but I am curious if any has run into issues using them.


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Old 5th July 2008, 03:54 AM   #2
jcx is offline jcx  United States
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I've used them for digital bus/control signal isoation in a strain gage amp, seem OK so far but I've not started testing EMI performance

read the app notes carefully, these do use magnetic coupling so it's possible putting them in a really bad spot could be problematic in a SMPS - know where your sw currents flow, and how far your magnetic component leakage fields reach
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Old 6th July 2008, 08:58 AM   #3
mflorin is offline mflorin  Romania
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I have used them to pass the PWM signal (PWM controller placed on secondary side) over the isolation barrier to driver circuit.
What I noticed is that at start-up when input side has an undefined supply voltage level (around 2 - 2.5V), the output generates some narrow pulses.
Those pulses can trigger your logics if, for example, such a digital isolator is used on a fault line.
It was the case of ADUM1100 but the manufacturer knows that behavior and I think they solved the problem by now (it happens about 2 years ago).
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