TPS54122 Control Loop Simulation, Value of Ro is missing in Datasheet

Sahmusa Akbayir

Other Parts Discussed in Thread: TPS54122

Hello,

I am trying to simulate the frequency and transient response of TPS54122 (SMPS device for power supply).

There is a model of switcher control loop given in datasheet of TPS54122 (see figure given below).

I entered the model into circuit simulation tool PSpice but unfortunately the value of output resistance Ro of error amplifier is missing. This values is not given in datasheet.

What is the value of Ro? Can you please help me with this information.

Thanks for help

Sahmusa

over 9 years ago

0 Ryan Eslinger over 9 years ago

TI__Guru 55940 points

Hi Sahmusa,

Co = 5pF and Ro = 2Mohm

Very Respectfully,
Ryan

0 Sahmusa Akbayir over 9 years ago in reply to Ryan Eslinger

Prodigy 80 points

Hi Ryan,
thanks for the information. I used these parameters in simulation model.
There is a big issue with compensation loop of TPS54122. I discribed it in a document and will enter here as a new issue. Can you please check it and give me feedback.
Thanks
Sahmusa

Power management

Power management forum

TPS54122 Control Loop Simulation, Value of Ro is missing in Datasheet