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TPS544C20

Abe Chen
Prodigy 30 points
Other Parts Discussed in Thread: TPS544C20

Hi,

I find that TPS544C20 have two different ground pin as following describing:

"AGND: Analog ground return for controller IC.  AGND should be connected to AGNDSNS
(Pin 13). AGND should not be connected to PGND, GND or the Thermal Tab. All
circuit connections to AGND should return to this pin and not be connected to the
AGND to AGNDSNS connection.

GND: Electrically Connected to Source of Synchronous Rectifier. Connect to PGND,
GND, Input and Output Capacitor Grounds"

As I know ,we usually connect two nets together at an point or with a Fe bead finally.

So I wanna know that Is there any potential risk if I connect those two net together directly?

What's the difference between connectiing and isolated.

Do you have any analyze report  about this action?

Thanks.

  • 0
    TI__Genius 11095 points
    Internally, the AGNDSNS pin its connected to GND. The Kelvin connection is needed to keep the two at the same potential while keeping the high speed AC switching voltages from the power stage from corrupting operation of the controller. The AGNDSNS to AGND connection is the connection between AGND to GND. Making another connection externally is the same as having two ground connection points. It will create a ground loop. connecting AGND directly to the thermal tab will create a positive offset in the current sensing. This can cause overcurrent to trip early for example.