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Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi guys,
I wondered if I could use some of these for a high frequency (>5Mhz) isolated gate drive for a class DE bridge. Their response time seems sufficient, but since they rely on capacitive coupling, I'm afraid that high-frequency voltage that will be present across them in this use could disrupt them. Anyone used them before?
I need precision deadtime control and ferritre transformers aren't too good for it at frequencies as high.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Yeah, to clarify - the ''gate driver'' in this case is a whole circuit - I'll use IXDD414's as power drive devices, and isolators to just supply the signal to them.
Another pet nuisance that seems to be present with nearly all high speed couplers (opto and non opto) is that in absence of primary side supply / logic low / led off they all seem to drive their output high. Since I don't want my bridge to self destruct if the input is left hanging, I need to invert the output some way... this adds additional delay, as one more inverter will also be required on primary side. I'm not sure of a best way to do it either - a BS170 mosfet with a pullup, a 74HC04/14, or some picogate device? I generally dislike the amount of delay introduced by typically used logic inverters.
Registered Member #3093
Joined: Mon Aug 09 2010, 11:40PM
Location:
Posts: 68
Marko wrote ...
Yeah, to clarify - the ''gate driver'' in this case is a whole circuit - I'll use IXDD414's as power drive devices, and isolators to just supply the signal to them.
Another pet nuisance that seems to be present with nearly all high speed couplers (opto and non opto) is that in absence of primary side supply / logic low / led off they all seem to drive their output high. Since I don't want my bridge to self destruct if the input is left hanging, I need to invert the output some way... this adds additional delay, as one more inverter will also be required on primary side. I'm not sure of a best way to do it either - a BS170 mosfet with a pullup, a 74HC04/14, or some picogate device? I generally dislike the amount of delay introduced by typically used logic inverters.
Marko
oh. makes more sense. it looks like those should work to send a signal to the drivers then.
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Using 150Mbps ''digital isolators'' in isolated gate drivers?
