IR2304 DATASHEET PDF

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Originally posted by bigbigblue Mar 16 , AM Does the MOSFET effectively latch on until the voltage on the internal gate capacitor discharges to below the threshold voltage? The reason I ask is that I can forsee a problem when there is a long "space" and a short "mark" in the signal from the gate driving logic.

In this case the voltage on the "bootstrap" capacitor will start to drop and the MOSFET may get into the linear region rather than being switched on hard , with a drop in the current through the motor winding and the MOSFET starting to get hot. Unfortunately I do not have an up to date schematic, only PCB layouts - I have been building up the design section by section as I go along. I need to update the schematic when I am nearer a final design.

Yes - I was aware of point 1. How do I decide what value capacitor to use - and what type should it be - i. I wonder if you would mind commenting on another idea I had for the high side drive? In my circuit I utilise an op-amp as a non inverting summing amplifier to generate a reference voltage for the lower comparator so I have a Vref of say 2. I was thinking that I could use a similar arrangement to create a high side driver.

I understand I would have to provide an additional supply for the op-amp and that the max motor supply voltage would have to be approx Is there a rule of thumb as to how many times higher than the fundamental frequency of the input the unity gain bandwidth of the opamp would need to be to give me an output which closely matches the input?

In other words do I need a 3, 10, 20, 50, or MHz opamp for this to work correctly? Click to expand My recollection of the term "DC Restorer" comes from television circuits and that it refers to taking an AC signal and "restoring" a DC offset. Although it is hard to see, this is working more like a "charge pump" or a "voltage doubler". The MOSFET is not latched on, what is happening is that there is an intrinsic delay in transfering charge from the gate capacitence to the surroundings. In my first response I was speaking in general terms, without having reviewed the IR datasheet.

After looking at the data sheet I realized that the switching regulator analogy was not entirely appropriate. I still have some questions about what is going on with the part, which the datasheet provides only ambiguous clues at best. The basic idea is still to charge C2 through D1 and then to add that voltage difference to VS to produce the gate control voltage.

The exact machinery for doing that remains obscure. Generally when picking capacitors I like to pick a working voltage that is 2 times the largest voltage drop I expect across the capacitor.

In non timing applications where an accurate charge discharge rate is not required the capacitence value is generally not critical.

In this case you want to find a value that will charge at a sufficiently rapid rate so that the gate control voltage is developed in time to be useful. The type of capacitor depends largely on the value. Up to 1uF ceramic capacitors work quite well. With respect to switching going on at kHz, which is what led me to believe that a switching regulator was involved. Even if there is one that can move at that speed, do you know that you must ramp the speed up to the final velocity so as to avoid a potentially large acceleration?

Do you also know that there are mechanical resonances which will cause the motor to stop and vibrate as the torque drops to near zero if you try to run at those speeds? Typical resonaces I have encountered are at Hz and 1. If this is a gain bandwidth issue then I would suggest a unity gain bandwidth of at least ten times the kHz.

In your case that would be about 5 MHz. I know it may be hard to believe but such parts may not exist, if they do exist they will be expensive, if you still insist on using them, they will be tricky to get working.

You will need to have careful layout, frequency compensation, and impeadance matching in your circuit design. As you increase the frequency of operation it becomes increasingly difficult to build amplifiers with gain much less the gain required of an opamp. I hope this helps.

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Originally posted by bigbigblue Mar 16 , AM Does the MOSFET effectively latch on until the voltage on the internal gate capacitor discharges to below the threshold voltage? The reason I ask is that I can forsee a problem when there is a long "space" and a short "mark" in the signal from the gate driving logic. In this case the voltage on the "bootstrap" capacitor will start to drop and the MOSFET may get into the linear region rather than being switched on hard , with a drop in the current through the motor winding and the MOSFET starting to get hot. Unfortunately I do not have an up to date schematic, only PCB layouts - I have been building up the design section by section as I go along. I need to update the schematic when I am nearer a final design. Yes - I was aware of point 1.

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