Hi;
I am looking for proper pcb layout for my 20x 2200uF cap bank smooting pcb for my Class-AB amplifier.
There are 3 main design i saw on the samples;
A) 2 LAYER PCB - Power plane over Ground plane.
B) 2 LAYER PCB - Power taces over ground plane.
C) 1 LAYER PCB - Seperatred power and ground traces and they do not overlap each other.
I am glad if you can explain which one is the right way to go? And Why?
I am looking for proper pcb layout for my 20x 2200uF cap bank smooting pcb for my Class-AB amplifier.
There are 3 main design i saw on the samples;
A) 2 LAYER PCB - Power plane over Ground plane.
B) 2 LAYER PCB - Power taces over ground plane.
C) 1 LAYER PCB - Seperatred power and ground traces and they do not overlap each other.
I am glad if you can explain which one is the right way to go? And Why?
Yep. A 4-layer board is a bit overkill for a power supply, but the layer stack-up is certainly attractive.
For a 2-layer board, put ground on one layer and then split the board down the middle on the other layer with V+ on one side and V- on the other. Of course that's easier with a few large caps rather than many smaller ones.
Tom
For a 2-layer board, put ground on one layer and then split the board down the middle on the other layer with V+ on one side and V- on the other. Of course that's easier with a few large caps rather than many smaller ones.
Tom
2-layer is plenty, scheme A means there's enough copper that traces shouldn't explode if you accidentally short the outputs.
Provide space between the caps for convection, or you lose some of the benefit of having parallel cap array.
Provide space between the caps for convection, or you lose some of the benefit of having parallel cap array.
Think I'd lay out a rectangular board. For the left half, 9 caps in a square array.
Same for right half. Split the ground plane in between the two arrays, only joining
the two halves of the grounds at the common output terminal at the top edge center.
The +/- output terminals are at either side of the common output. Always twist
together the three wires to the output board.
Rectifiers are along the bottom edge of the board, one at left and one at right, along with a pair
of secondary winding terminals near each.
The remaining two caps can be local bypasses on the main amplifier board.
Same for right half. Split the ground plane in between the two arrays, only joining
the two halves of the grounds at the common output terminal at the top edge center.
The +/- output terminals are at either side of the common output. Always twist
together the three wires to the output board.
Rectifiers are along the bottom edge of the board, one at left and one at right, along with a pair
of secondary winding terminals near each.
The remaining two caps can be local bypasses on the main amplifier board.