Re: seek automobile 5.5V power

"w_tom" <w_tom1@xxxxxxx> wrote in message
news:1181281875.622181.201560@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Restart you quest for information by learning about 'load dump'.
Both ISO and SAE have standards for this automotive problem that must
be addressed in the design of that power supply.

For example, a 40 volt regulator is not sufficient. Load dump on 12
volts is defined as up to 260 volts - but designs should make at least
60 volt electronics protection sufficient.
SGS Thompson put this in a 1996 application note of numbers your
design must address:
"The overvoltage is named the load dump and can be defined by the
following figures:
- Peak voltage 80 to 100 volts
- Duration 300 to 400 milliseconds
- Series resistance 0.2 to 1 ohms"


Thank you Tom. Can you tell me what kind of device or circuit I should look
at for 'load dump' protection? I understand to simulate "load dump", you
charge capacitors in test fixture, and then discharge into Device under
test.

Can you give me the link to this SGS Thompson 1996 app note?
Are you talking about STMicro's RBO40-40 type of devices?
http://www.st.com/stonline/products/literature/ds/5484.pdf


.

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