Hi again MrAl
Thanks again for taking the time on this... I had not anticipated this little part would cause me so much grief..
With regard to the IR2183s, I originally got 4 of these when Ron suggested them as a replacement... and they do indeed say IR2183 on the top (I got reasonable pictures with super macro)... I blew one up... actually it vaporised the ground or com leg.. so I am down to three.. I have one still in its plastic casing. I checked the two I have out and they are giving identical results...
OK the traces as requested from the IR2183:
1). Hin and Lin with Lin being the top trace:
View attachment 62684
Here are the probes settings for the previous picture... Channel one is the channel being triggered from and its on pin 2 or Lin - top trace.
View attachment 62686
2). Lin and LO (triggering off Lin)
View attachment 62687
..and the way I connected the probes for this... Channel one is connected to Lin and is the channel used for triggering.
View attachment 62688
2a). I added this in so you can see that the output HO for HIN is actually inverted which is, from what I can gather different from what I should be expecting...
View attachment 62692
Here is the way the probes were connected.
View attachment 62693
3). Finally LO and HO. I left the channel 2 probe on LO and moved the channel 1 probe from Lin to HO so in this picture its triggering off HO.
View attachment 62689
..and the way the probes were hooked up.
View attachment 62690
So to summarize this.... Pin 1 is HIN and pin 2 is LIN. The inputs for these are coming from the TL494 emmitter and collector respectively. This provides a situation where the input for HIN and LIN are non inverted and inverted as per datasheet.
Output for Lin is inverted.
The problem I note in 2a and 3 above is that HO is inverting along with LO. HO should not be inverting but it is and since we have an input where one signal is inverted we need an output were again only one signal inverts... both signals invert again and so they are synchronous... not good for a half bridge.
This is how I see it... ultimately HO is being inverted from its input... when the datasheet says otherwise.
Let me know if there is anything else you need or whether I have made a simple mistake in the way I have hooked up or.... interpreted the detail..
Again kind regards
Simon