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LM3421: LM3421-PWM dimming waveform

Part Number: LM3421

Hi Ti Team,

1, I use LM3421 to do a step-down parallel dimming. Figure 1 is my test PWM dimming and main switching waveforms. Is the following figure normal? The schematic diagram is refer to Figure 2

Figure 1:

Figure 2,

2,There is also a problem: increasing the capacitance C0 will not be able to dimming, no matter how large the capacitance value of CO