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LM3549: PWM Output current graph question

Part Number: LM3549

Hi Team,

Would you advise which is the correct description of the output current control method

of Figure 13 datasheet on page 8,

1. DC light emission in which the forward current value changes according to the duty

OR

2. For forward current value is fixed value set by register, PWM drive traced PWM waveform of input.

Thanks

Best regards,

Shidara