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Radiated susceptibility problem-PWM dimming

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If this does not work, you need to look deep in the op-amp side. Power supply impedance is too high OR power supply is having too much voltage ripple.

The question is high much ripple is acceptable at the op-amp stage? I do not know but you have to dig. and dig more.
Click to expand...

Adding capacitance to the power rail that feeds the op amps should fix the problem, isn't it?

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It is tested in a test house, and the level of light dims and it is visible by the human eye.
 

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