In order to meet the thermal loads associated with the DLPC7530, TI recommends the following enhanced PCB design parameters.
- A minimum of 4 power and ground planes
- Power layers: 1-oz. copper; Ground layers: 2-oz. copper
- Top and bottom signal layers: minimum 0.5-oz
copper
- Internal signal layers: 1-oz copper
- Thermal copper ground planes beneath the thermal ball array of package containing a via farm with the following attributes
- Thermal via quantity to ground plane = 64 (as 8x8
array)
- Thermal via size = 0.229mm - 0.25 mm (9mils - 10 mils)
- Thermal via plating thickness = 0.025 mm (1 mil) wall thickness
For signal integrity reasons, FR370HR or equivalent high performance epoxy laminate and repreg is also recommended.