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Do you really need to switch all four mosfets? You could have a top mosfet at a fixed state and switch the bottom mosfet at the opposite leg. For instance, you could keep Q1 on and fast-switch Q4. It will be more energy efficient that way.
Add some dead time as @FvM has mentioned.
So you intend to allocate variable time slots to each device you are discharging into with the time depending on the voltage level of any particular device. I guess, that is so all devices will be fully charged at the same time? And also the overall charging+discharging period is also variable...
First, I don't think you really meant to mean floating point. That representation could also be for fixed-point. If you are saying "20.35 times", it may mean that you need an increment value of 0.05. ln other words, you need to generate a clock that is 1/0.05 times faster than your reference...
Please give more detail about your circuit. What you have presented is not sufficient to determine the necessary protection.
--What system is it?
--How is the transducer intended to be connected to the controller?
--What environment is it intended to be used?
--etc
There are several ways to do this. You would need a mod-3 counter (0-1-2-0-1-2-0-1-2-...), then you would connect a custom 2bits-to-4bits decoder to obtain 1-9-1 from the 0-1-2, respectively.
To design the decoder, you need to use the truth table and then derive the logical expression for each...
Why do you think that a 20mA transducer would output 40mA?Standard transducers have current limiting. @KLAUS has mentioned 0-24mA as the range for the 0-3.3V reference, which is what it should be and I didn't mention it in my previous contribution because you didn't mention that the 3.3V was...
The TL431 is more of a zener diode than a transistor. So here I should have been saying breakdown rather than saturation. So the snippet posted by @FvM shows that it breaks down at Vref of about 2.5V (2.495V typical, with min and max values also specified) with an Ik current draw of 400uA...
Required voltage span for specified current span of (20mA - 4mA = 16mA) = 3.3V - 0V = 3.3V.
Voltage-to-current ratio = 3.3V/16mA = 206.25V/A.
Required voltage offset for the 4mA live zero = 206.25V/A * 4mA = 0.825V.
Required voltage range for the 0mA to 20mA (i.e. 4mA live zero + 16mA span) =...
This snippet is showing that the TL431 is in cutoff at (0V ≤ Vref < about 1V). At this region, the cathode current is about 0uA. It is in the linear region at (about 1V ≤ Vref < about 2.5V). At this region , the cathode current increases, although not linearly, from about 0uA to about 400uA. It...
Hi,
To be honest, your question is not very clear and we have only been trying to look for a way to squeeze out an answer for you, even when the question is not clear.
In your fourth paragraph, you mentioned "efficient power transfer" and in your fifth paragraph you mentioned "alot of power"...
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