Many users responded that for the same drive circuit, the inductance produced by A is no problem, but the inductance current produced by B is reduced. In this case, look at the inductance current waveform. Some engineers fail to notice this phenomenon and directly adjust the Sense resistor or the working frequency to the required current, which may seriously affect the service life of LED. Therefore, before the design, reasonable calculation is necessary, if the theoretical calculation parameters and debugging parameters are a little far apart, to consider whether the frequency drop and whether the transformer is saturated.
When the transformer is saturated, L will decrease, leading to a sharp rise in the increment of peak current caused by transmission delay, and the peak current of LED will also increase accordingly. If the average current doesn't change, you can just watch the light fade.

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