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Just to confirm what we already knew, I put 50 watts (output of 10V 5amps) and all remained cool.
I had trouble measuring the actual efficiency - I measured 99-102% - with about 3% known calibration errors, plus there is a fair amount of ripple (which will not be an issue hooked up to a battery)...
neddle,
Thanks for the comment, I wanted to experiment with dead times to see how good a software hunt for min dead time would work. The IR2184S has rather long dead times (500ns) and I thought I really didn't want the lower diode to turn on.
As it now turns out, the particular PIC I had...
I went looking at some data sheets for high voltage FETs, found the spec and then noticed it is on the NTD4963N spec but not the MCP87018. The NTD4963N specified a "Drain to Source dV/dt" spec of 6V/ns which seems pretty fast (for low voltage stuff). I don't understand the 100A/us dIS/dt test...
JVM,
Continuing somewhat off-topic (but not really), I never really thought about the gate reference "switching" in reverse conduction, but I will add the observation that this effect will considerably slow down the transition times as this adds negative feedback to the gate(pin)-source(pin)...
EDIT: reread my original post and see that I didn't mistype (so I was a little less wrong!)
Sorry about that.
First I mistyped and you need strcpypgm2ram();
Secondly I guess it's been a while since I did C18 compiles and even with the correct function you still get the error.
The reason is...
The type mismatch is because the function strcpy expects both arguments in ram, but "Haaaaaa" is stored in program space. You need to use the function strcpypgm2ram
It is one of the big pains about the pic 8bit processors that all constants are stored in flash and need different routines to...
"The more I know the more I know I don't know"
Still perplexed, but convinced that the problem is measurement error and not some layout or some strange FET behaviour I didn't understand.
Changing the load current did not seem to affect the measured drop across the fet, but did across the diode...
First of all, I should have mentioned that I a retired software weenie, who only knows enough about hardware to hurt myself!
That said I was (am) pretty proud of the layout even if it is on stripboard, as it is very clean and the intention is to add #14 copper wire (didn't figure it was...
I'm using an old 60MHz Tektronics analogue scope; however, the probes are compensated correctly (albeit to a very slow 10Khz calibration signal). I can read all the other waveforms in particular the high-side measurement (same signal) which shows no such voltage drop. As well the difference...
I simulated (ltspice) and built this circuit (in actual fact I used Microchip fet drivers TC4432, TC4427, bigger caps - 2200uf, and 1/2 an SRS2525) and all was wonderful until built the circuit on a stripboard and tried it (duh).
The fets are 18mOhm @4.5V.
I used a micro to drive the PWM, SPWM...
I just edited my post to start the resistor chain at 12Vdc as I had intended (but did not do!).
The OP and I crossed posts this morning where he adds the the 12Vdc is from a car.
Car electrical systems are not very friendly, and are only nominally 12V. When the car is running the actual...
You can not put the resistors on the output of the opamp - it will always be high or low - you need the resistors on the input.
Regardless you do not need the opamp at all, but rather three resistors. e.g. from 12Vdc to Gnd
12Vdc - 5.6K - 3.3K - 2.2K - Gnd
Your signal is attached to the...
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