At 9V, the PWM driver will see the LED flicker that can be recognized by human eyes. When testing the waveform with the oscilloscope, it is found that the power supply voltage is forcibly pulled down by a few tenths of a volt. When the voltage is adjusted to 10V or above, the flicker disappears, but the phenomenon of forcibly pulling down the power supply detected by the oscilloscope still exists.
This phenomenon is especially obvious when multiple devices supply power at the same time. The waveform of tail point is as follows. Please help analyze whether this phenomenon is normal and what causes it.
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Can you please clarify the following points?
Please share the complete schematics along with the point where you are measuring the waveform? Since ,I am not able to find the tail point in the complete schematics.