Tips for 2 layer PCB

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johnjoejohn

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I am making a 2 layer PCB for a motor driver, whats the typical layout for a 2 layer pcb?
Is one layer lets say the bottom ground? And the top layer for power and connection of components? Or how should I do this, the expected current draw will be around 15+ amps continuous.
 

Is this a PWM design? If so, you'll need to pay attention to ground-plane and layout. 15 Amps is a fair amount of current, minimum trace widths should be about 500 mils (12.6mm) If you can have a solid ground plane on the bottom, that would be great, but not at the expense of needing longer traces on the other layer.
 

johnjoejohn said:
...Is one layer lets say the bottom ground? And the top layer for power and connection of components?...
Click to expand...

This is a common practice, but there are a number of other recommendations, including the physical (but not electric) separation of ground planes, greater thickness copper, solder mask removal, etc...


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andre_teprom said:
This is a common practice, but there are a number of other recommendations, including the physical (but not electric) separation of ground planes, greater thickness copper, solder mask removal, etc...


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Click to expand...

Help me understand, for a 2 layer, if bottom is ground and top is power...wouldn't all the component on top be all connected to power??....Guess im confused
 

johnjoejohn said:
...wouldn't all the component on top be all connected to power??....
Click to expand...

I meant that you should spread the ground plane as much as possible along bottom layer, but during routing activity should give priority to power connections, which certainly you can´t succeed restricted just to top layer, having to do on both layers.


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Without at least a schematic we can only guess...
Voltages, current, devices etc etc
 

Try to keep tracks to the top so that you can get more ground on the bottom but as said - not at the expense of making them much longer.
 

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