Electronics > Projects, Designs, and Technical Stuff

28V to 5V buck, 300mA, automotive aftermarket

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max_torque:
Do you really need a 32b capture to get wheel speed?  Assuming you aren't doing ABS or anything like that (in which case your CAN latency is going to be an issue), then an axle goes round at about 1krpm maximum (less for a truck), so even a 16b counter is going to give you something like 0.1 wheel degrees per second resolution !!




The important bits to work out before you start spec'ing anything will be:

1) Temperature range
2) Sealing (IP rating/ salt spray etc)
3) Vibration
4) Life time (esp for capacitors in hot environments!!)
5) EMC requirements (conducted and radiative)
6) Power supply (24v nominal systems are actually ~28v when operating, and load dump is up to 212V !)


One thing to do would be to ask your customer to what standards and test procedures there (mechanical) product is currently rated, and see if those apply to your electronics!

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