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.
Thanks
http://www.analog.com/en/interface/digital-isolators/products/index.html
Thanks
http://www.analog.com/en/interface/digital-isolators/products/index.html
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
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
Hi
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).
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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