TPS61196: About EMI Radiation improvement

Hi Terry,

1. The input loop area (including inductor) and output loop area (including diode) should be as small as possible.

2. The switching node size should be as small as possible.

3. Adding via to SW is not recommended.

BR,

Robin

Hi Robin,

Thanks for your kind reply. But we can't modify PCB layout because of the customer's schedule.

Could you please recommend how to adjust the specification of components (like capacitor or resistor...etc.) to reduce EMI radiation?

Thank you!

Best Regard

Terry

Hi Terry,

Adjusting the resister and capacitor of MOSFET gate could configure the slew rate. Slower rate is helpful to reduce EMI radiation.

BR,

Robin

Hi Robin,

According to your recommend and chapter 8.2.2.3 of TPS61196's specification, it seems to mean R19 resistor.

Should I adjust the resistor value to be above or below 3 Ohm? And, would this adjustment affect other functions? 

Thank you!

Best Regard

Terry