Hi, I am trying to use INA293A4 as current signal amplifier hi side aplication with 24V Vcc, 2mR Rsens and 3,3V supply for cycle by cycle current limiting in DC/DC buck converter. Firstly at starting up the board I set frequency to 100kHz an set constant PWM at 25% and watch waweforms, which are weird for me. Please take a look at it and tell me if it should work as it is?
Brown - Inductor current
Green - INA output
Yellow - PWM
Then I set PWM at about 80% and this is the waveforms:
After that I increase sens resistor to 10mR and changed INA293A4 to INA180A1, and wawefoms look wery similar.
Here is the layout:
I was expected fast clean response but get more than 1us delay and slow falling response.
Am I doing something wrong?