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Registered Member #3007
Joined: Sat Jul 17 2010, 02:35PM
Location:
Posts: 12
Hello All,
I am attempting to drive a half bridge with an IR2184 driver chip and am having some issues. I have had no experience with high side driver before so am seeking advice.
The circuit I am following is:
The half bridge is issolated from the mains so it is floating. The 15v vcc is being driven a workbench power supply.
The input of the ir2184 is being driven by a square wave generator.
I am a little confused as to where the com connects too? Does it connect to the half bridge gnd supply or the gnd supply of the workbench power supply. I just cant seem to get it too work,
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
com is a common tie point for the negitive. be carefull this circuit is floating and attension should payed on how it is connected up. If I were going to connect this up I would get a transformmer to seperate the lines nutral from the negitive of your circuit so you can make safe mesurments. At the IR website you may be able to find some applications data. I would start by connecting up the circuit in the PDF for this device and injecting a signal.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
I used that driver chip on my first board. Instead, use a gate drive transformer and the tc4421 and tc4422 driver chips. This setup was more robust and does not fry as easily if you make a mistake.
Registered Member #3007
Joined: Sat Jul 17 2010, 02:35PM
Location:
Posts: 12
I was using originally using the tc4421 / tc4422 with drive transformer but figured the ic method to be more favourable ie cleaner waveform / inhibit and so on.
I knocked up a test circuit using the ir2184 and running off of 12v supply driven by a 5v square wave. It kind of worked ie the half bridge was switching. But when measuring the gate drive inputs I noticed that the high out was about 12v while the Low out was around 7v additionally i noticed that everything seemed to appear to be floating negative by about 2v not sure why?
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IR2184 High Side Driver Help Required Please!
