TPS548A28: GND connection

Yasushi Fujiwara

Part Number: TPS548A28

Hello Experts,

I have question as follows. Would you please answer them?
1. For single-end sensing, SNS- terminal connects to AGND per the datasheet, correct? At this time, the datasheet mentioned "For single-end sensing, connect the higher FB resistor to a high-frequency local bypass capacitor of 0.1-μF or higher, and short VSNS– to AGND with shortest trace.". Where does the bypass capacitor connect? Does it connect to between FB-pin and AGND?

2. For single-end sensing, the capacitor of SS/REFIN is connected to AGND(SNS- pin), correct?

Best Regards,
Fujiwara

over 3 years ago

0 David_Daniels over 3 years ago

TI__Genius 16720 points

Fujiwara-san,

1). AGND connects to the VSNS- pin at the device for single ended. The 0.1uF is across the Cout capacitors.

2) Yes, SS/REFIN capacitor is connected to VSNS-(AGND).

0 Yasushi Fujiwara over 3 years ago in reply to David_Daniels

TI__Genius 11755 points

Hello David,

Regarding question 1, you mentioned that it is C11/C24 in EVM, correct? (p16, "3.1 Schematic" in below user manual.)
https://www.tij.co.jp/jp/lit/ug/slvubo1/slvubo1.pdf

Best Regards,
Fujiwara

0 David_Daniels over 3 years ago in reply to Yasushi Fujiwara

TI__Genius 16720 points

Yes, C11 and C24 are the capacitor to connect the feedback resistor.

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TPS548A28: GND connection