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ZHCS429J March 2012 – November 2021 UCD3138

PRODUCTION DATA

The first thing that must be done in any layout is to set up the basic grounding strategy and the placement of the decoupling capacitors. This needs to be prioritized over anything else, even the routing of sensitive feedback signals.
If a gate driver device such as UCC27524 or UCC27511 is on the control card and there is a PGND connection, a net-short resistor or large copper trace must be used to tie the PGND to the Power RTN by multiple vias. Also, the net-short element between Power RTN and PGND must be close to the driver IC.
Unused ADC pins must be tied to SGND.
Avoid putting V33D and V33A long traces or planes close to radiation components. Place them into an internal layer. It is preferred to have ground shielding.
Avoid putting bias supplies or SGND or Power RTN directly to across the switching power train where they can couple switching noise. If the grounds are coupled with noise, the decoupling capacitors may not be effective at filtering the noise out.
Local capacitors are preferred to provide a short path for switching current, and be careful to select a quiet RETURN point to connect.
In a power module or a tiny PCB design, a single solid plane without the grounding separation is shown in Figure 12-7and has a single point connection with power RTN or SGND near the connector. Ensure there is no current flow from power train into the signal ground plane.
Figure 12-7 Single Ground Plane for a Power Module Design