mosFETs and Transient Voltage Protection (schematic Uploaded)

[Falcon69]

Any thoughts on the layout?  Does it look fine? Do you think I can go ahead and have the boards made?

I think it will work, I followed the data sheet info for the OnSemiconductor LM2596 chip. Though, to save money, I will try and buy the LM2596 chips off eBay and hope they work fine.

I am guessing, that since TI bought out National Semiconductor, that there are alot of legitimate LM2596 chips out there with the branded National Semiconductor name on them, but the chip still seems Identical to the TI chips.  In fact, the data sheets I have found for the National Semiconductor chips look like an exact copy for the TI data sheets.  Am I wrong?

Thanks in advance.  If everything looks good, I'll order the boards today.

I'm anxious to get these working right as I'll be using them on my own machine. Get this headache out of the way, and I can start working on building the machine again.

Jason

[T3sl4co1l]

TI/National are one in the same now, but that doesn't mean suspicious lots aren't suspicious...

Layout looks good I think, at least at a glance.

Hatching doesn't save you anything, unless you're doing toner transfer (solid toner areas don't usually maintain density).  If it's dense, it will carry heat as well as solid, but low density obviously won't.

Tim

[Falcon69]

Ya

They had mentioned, (in this thread or another) that stray signals or noise could be transferred through the hatched or solid pours if they are not connected to ground. That was my concern.

I'd like to keep the hatched look, I like it, but if it hurts the performance of the board, I don't want to. (fyi, the top copper pour/hatched, is not connected to ground plane, it's just floating for looks)

Tim, the components all packed tight like that isn't going to be a problem?  I have about .45-1mm between the components for the POWER traces and like .24mm for the traces.

[T3sl4co1l]

Don't leave floating copper, ground it.  Vias are cheap (free?).

[Falcon69]

Okay, that is what I thought, I will leave it off then. 

I thought about the soldermask color, and because the switches have LED's that light within encased resin, I think a White soldermask would amplify the color of the LED's light.  I really like the black look, but I think I will order them in white because of the LED's.  I so hate the color green. It's so generic.

I'll get these ordered up, and let you know how it goes.

Thank you Tim!

Jason