In the same drive circuit, the inductor produced with a is no problem, and the inductor produced with B is reduced.
In this case, to see inductor current waveform. Some engineers do not notice this phenomenon, directly adjust sense resistance or working frequency to achieve the required current, which may seriously affect the life of LED. Therefore, before the design, reasonable calculation is necessary, if the theoretical calculation parameters and debugging parameters are a little far, to consider whether to reduce the frequency and whether the transformer is saturated. When the transformer is saturated, l decreases, resulting in a sharp increase in the peak current increment caused by the transmission delay, which in turn increases the peak current of the LED. Under the condition of constant average current, we can only watch the light decay.
