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Wow, good information. Regarding software, what would I use on a Mac for the Bus Pirate? Would I use the Terminal program? I have never used Terminal to talk to a USB port. Do I need unix-type commands to establish communication? I know these are very basic questions - thanks for your patience.
I would like to communicate with a MEGA8-AI over its I2C port. Can this be done on a Mac? I've heard of the Aardvark host adapter but it is $250. It comes with software for OS X. I'm kind of new at this - I hope there is a cheaper way. Thanks.
The attached circuit may work. There is just sufficient margin between the two devices for the logic levels to work properly. It is unclear what will happen when the two IC's power up simultaneously, but the circuit should stabilize with the MOSFET off.
If anybody has other part suggestions...
Good to hear this. Any part numbers for opto isolated devices? I have not seen any so far.
I'm sorry, I really don't understand what you are talking about. This is a P-channel device.
I haven't seen this discussed before - do you need to worry about the sense of a MOSFET driver output? If your control signal disappears, shouldn't the FET default to the off condition? Notice in the figure that the FET turns on if the LED turns off. Are driver ICs available in both senses...
Regarding MOSFET drivers, it can be hard to get the big picture. Some factors that make a difference are:
- Will your topology require a low side or high side MOSFET or both?
If you use a high side FET, here are some further questions...
- Will the FET be N-channel or P-channel?
- Can you...
Minor correction: I think these drivers are designed to allow you to use two N channel devices.
What do VB and VS typically look like? Are they both swinging up and down, following the load voltage? To me, the data sheets are not clear, as shown in the attached figures. What are the HO and...
I think this device (FAN7382) might provide the voltage for the gate drive. It is from section 6.4 of the bootstrap app note. I still don't understand how it works. It is not optically isolated but it is faster than the HT0440. Maybe you can let me know if this circuit actually works. Thanks.
Keith, thanks a lot. This really helps.
a) I just found an app note from Fairchild that shows how to bootstrap a gate voltage (see below). This is new to me and I especially don't understand the use of the HVIC at the bottom. Is this how to use the FOD3180?
b) Regarding the HT0440, it...
I am looking at two MOSFET driver ICs that are similar, the Supertex HT 0440 and the FairchildFOD3181, but some basic information is missing...
1) Do these devices provide output voltages to drive the gates or are they just passive switches?
2) Can anyone point to actual schematics that use...
Re: Using a PWM controller
This figure shows what I would like to do. For now it is a concept, until I am sure it's OK to use a 35 Volt part in a 140 Volt application! Are these controllers commonly used this way?
I would like to use a PWM chip in a 100V + buck converter application but the ICs are rated at 30-40 volts max. Would like to drive an external MOSFET and I need help interfacing from the chip output to the FET. The typical ICs are... TL2842, TPS40200, or UC1573. This may take a little...
I have some questions about ferrite cores. I have given each question/topic its own reference number. I would appreciate if people don't ask me what specific circuit I am designing as there is more than one and I am at a very basic level at this time.
1) Are there generic or standard...
I know this parameter is very important but I cannot find a good definition on the web. Most often it is written A-sub-L. Further questions...
3) What is meant by a summation of area over inductance? (∑ A/l)
4) Are the units of A-sub-L equal to Henrys over turns squared? (If so, this would...
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