You can see from this that the 393 does not have 12v... the only thing with 12v on the entire board is the driver chips output stage.. the rest is 5v... so don't worry about that aspect.... ie vcc of 393 is +5v
Drive the IFB pin with the current transformer, and it will activate at 0.5v and pull outputs down to zero instantly.... no messing about.
Drive the TFB with 5v and it will stop instantly as well.. both are soft start recovery with pin 21 high ( soft start select)
And of course pin 6 is soft start and instant stop if pin 21 high as well.
By turning off the 5v as you suggest, it goes through the under voltage lock out protection I think... thats where the lag is I suspect... I have not tried it... bit dangerous to do as a control I expect. Anything may happen as the voltage degenerates, I fully expect the under voltage lock will work out fine... but....it is doing this with a decaying voltage on the drivers too, and not sure if that will always be a good result.
Providing you ground the pin 13's of the 2110, you will have no problems. I did that by cutting the 393 off, shorting pin 1 to 4.. there are probably more elegant ways to do it, but that works.... then you can use the current sense as you would expect to have done.... ie a CT and rectifier to pin 1 of your interface.
pin6 spwm will now be pulled high by the 10k r30. I found that on my 8010 board, it was best to make it more definite and lower impedance, in fact I use 5v for on and a pull down resistor of 1k5 or thereabouts to shut it off by default if you want a stop start switch, thats the way to go I think. The temp is as good as any without getting to the 002 board direct.
I know this works.
But I don't use the 002 boards anymore... so I have 10 or more spare..... I like the 8010 boards instead.
It does not matter which board type you use, you will need an isolated AC feedback to achieve consistent AV out voltage if there is any chance of the battery side sharing an earth ( high impedance as well as low) with the ac side ( off gird house with MEN earth system etc). Can be opto or transfromer... I used the transformer, as I have plenty of 1w 14v type to burn up that I haven't used in over a decade or more.
I think I'm the last person on the planet with an old fashioned Cathode Ray Oscilloscope now ...... feeling very old.....
......... oztules