Do you see any reason to the contrary?
Output shorts and current limiting should be handled by the regulator -- it claims to handle such faults in a graceful manner. However, I would not oppose a 500mA fuse (ala USB power entry circuits) on the connection between this and the load. Good suggestion.
$ 1 5.0E-6 10.20027730826997 50 5.0 43172 160 208 160 176 0 6 27.6 30.0 -30.0 0.0 0.5 Voltaged 176 208 224 208 1 0.805904783r 240 208 288 208 0 47.0z 304 256 304 208 1 0.805904783 20.0l 320 208 368 208 0 9.999999999999999E-6 0.009189132775834264c 384 208 384 256 0 4.7E-4 20.216092108038907w 160 208 176 208 0w 224 208 240 208 0w 288 208 304 208 0w 304 208 320 208 0w 368 208 384 208 0g 304 272 304 288 0O 448 208 512 208 0r 448 208 448 256 0 2200.0w 384 208 448 208 0g 448 256 448 272 0g 384 256 384 272 0w 304 256 304 272 0o 0 64 0 35 40.0 0.4 0 -1o 9 64 0 35 40.0 0.1 1 -1o 17 64 0 35 7.62939453125E-5 0.2 2 -1o 5 64 0 35 40.0 9.765625E-5 3 -1o 12 64 0 34 40.0 9.765625E-5 4 -1
Consider putting a bridge rectifier on the input side rather than a diode?
25 A 400 piv full wave bridge on the input makes this able to be used in positive or negative ground vehicles or ones with reversed positive on the power outlet
While I've never designed a switched mode power supply, I thought it was possible to design them so that they tolerated an input voltage up to the breakdown voltage of the switch. In that case, if you target 24V or 30V or whatever as your peak input load, there'd be no normal situation where your crowbar overvoltage protection was required.
If this is intended to be a generally robust supply it would be worth providing enough output protection for either output line to be shorted to ground, 12V or the other output line.
If using a fused protection, you would earn lots of brownie points by using resettable (or even self-resetting) breakers rather than a disposable fuse.
on the output stage use the following 7812 + 12v reg ti makes these with a 125v input rating use that version its rated at 1.5a
ill look in my design library for a power management ic that will provide a soft on function that allows the system to come up easy to avoid damage as well as over under voltage protection to prevent turn on if either is present
also make sure to place a 4700uf cap between output and ground and a 480uf cap between input and ground they should both be rated at 100 v
the full wave bridge is to be placed at the input of the switching supply along with two 68,000uf 50v caps
Just wondering, we plug sensitive electronics like GPS, ipods, etc into our lighter sockets all the time and they don't fry left and right. Do they have this type of circuitry built it or are our boards just sensitive to spikes and such?
I think your schematic is not quite right. According to the datasheet, the input supply should go to pin 6, not pins 1/7/8.
R1 is too high. At 1A output, the input current will be around 0.7A at 10v input, and a 10 ohm resistor will drop 7v.
I'm not sure you should worry about a 24v jump start, you will have other things to worry about (like the 12v vehicle battery exploding).
I wouldn't use a bridge rectifier on the input, you already have a protection diode and if you are going to use mosfets to switch anything running from the 12v supply, you will need a common ground anyway.
I don't understand -- how's it dropping voltage? Unless the TVS is clamping there's no voltage divider, and it should only act as a current limiter. What did I miss?
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