TPS61181: Measuring Phase(Gain) Margin

Kuramochi Tadahiko

Guru 28715 points

Part Number: TPS61181

Hi,

I would like to measure the phase margin of TPS61181.

And I will measure in such a following way.

https://www.ti.com/lit/an/snva364a/snva364a.pdf?ts=1596185401108&ref_url=https%253A%252F%252Fwww.google.com%252F

Then, should the small resistor(20Ω) be inserted into the following red rectangle?

Best Regards,

Kuramochi

over 4 years ago

0 Sean Zhou over 4 years ago

TI__Mastermind 22745 points

Hi Sir,

When you want to measure the phase margin, you need to insert a 50ohm resistor to "Vo" pin, not the "SW" pin. That means you need to put the resistor between D1 and "Vo" pin.

Sean

Power management

Power management forum

TPS61181: Measuring Phase(Gain) Margin