Thanks, Aubrey. I was thinking of using it on an analogue variable power supply, before the main pass transistor. Apart from being able to switch the output off electronically, you could get a ground-referenced voltage proportional to output current - very useful for measuring output current using a standard DVM module - which on a variable PSU is otherwise not easy.. Looking at the specs for your IR3314, I think it would work ok. I'll look at the others as well. Are these things expensive?
This is an incredibly complex question. What is a good price for me is really expensive for someone designing for the mass market. Before I overwax philosophical though, it seems to me you are only interested in a single unit, so I will only state the price from Digikey for the automotive version AUIR3314S is C$4.81. (C$1 is approx US$1.) Apparently it is still available in a TO220 pack, if you want ease of connection although you may struggle to find it in that format although I see Digikey have 6 at C$6.95 at the moment and Mouser have it in abundance.
Speaking of high-side power switches with protection and diagnostic functions, have you read Infineon's ADVANCED SENSE Calibration and Benefits guide (http://tinyurl.com/ADVANCED-SENSE-1-0)?
As an aside... I happen to know that the guys who wrote this little rascal are incredibly clever and handsome and witty ... the words all appear to have been hand-picked at the crack of dawn while the morning dew is still glistening on them, and it goes without saying that the quality of the diagrams is fantastic...
the words all appear to have been hand-picked at the crack of dawn while the morning dew is still glistening on them,
These are the exact same words that I saw on an old recipe for making Rose Petal Jam. (new recipes like this, lose the magic!) I printed the manual out, shredded it and spread it on bread- but it doesn't taste anything like jam!
Seriously though- a well written document. Infineon obviously has good taste in authors.
@Aubrey, thank you for sharing information on these current sense devices. I was not aware of these devices and never used so far. But looks like I sould be able to make use of these devices in my designs. You mentioned about calibration. Do these devices require runtime calibration or one-time calibration in the factory before shipping? Without calibration does it make a huge deviation or could the tolerance be accommodated in the firmware if too much of accuracy not needed?
Blog Doing Math in FPGAs Tom Burke 21 comments For a recent project, I explored doing "real" (that is, non-integer) math on a Spartan 3 FPGA. FPGAs, by their nature, do integer math. That is, there's no floating-point ...