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Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
So, I was researching means of achieving galvanic isolation. Of course, there's the GDT and the optocoupler, and then there are those slow bootstrap high side drivers which tend to have 600V of isolation.
Today I ran into a new family that has breakneck speeds. At first I was turned off by the name "Digital Isolator" but then found in the datasheet that they are good down to DC.
<10ns propagation (worst case scenario) up to 5kV galvanic isolation -and under $2 for a single version!
I've integrated them into my DRSSTC design and will let you know how they work out... eventually!
Just wanted to know if everyone but me already knew about these or if they are a serious alternative to our current methods.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
ScotchTapeLord wrote ... I've integrated them into my DRSSTC design and will let you know how they work out... eventually!
Nice parts, especially when you need to transfer a number of digital signals across an isolation barrier. How are you providing power to the secondary side of the isolators?
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
Klugesmith wrote ...
ScotchTapeLord wrote ... I've integrated them into my DRSSTC design and will let you know how they work out... eventually!
Nice parts, especially when you need to transfer a number of digital signals across an isolation barrier. How are you providing power to the secondary side of the isolators?
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
There is a sibling series of isolators that have gate drive capability:
but I chose this particular one because I was planning on using it with high side drivers similar to this:
Using separate isolators and gate drive chips, I can get the propagation delays below 20ns into the gate driving FET bridge, but it would require 4 separate components. Using the gate-drive enabled chips I would only reduce the component count by two but would subject myself to up to 60ns of latency. On the other hand, it gives an easy way to control dead time... But I'd have to invert the signal going into the driver because the gate-drive rated ones are only non-inverting. Gosh.
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Isolators
