LM3435: About current consumption when turning off the red LED

Hi Kato, 

Could you please give more description about the following questions?

• -"When the Red LED is turned off, the current consumption of the LM3435 increases by about 1A momentarily."

             does this means when you pull down the RCTRL, the input current of Vin increase to 1A momentarily?

• when turn off the red led , what about the changes of Vout?
• if it is OK, please provide the waveform of vin/Iin/vout/GCTRL when turn off the red and green led respectively.

Best Regard

Monet Xu

Hello Xu-san,

I attach the waveform here.
Only when the red LED is operating, the fluctuation range of Vout is large. Does the fluctuation range increase as Vf decreases?

Best Regards,
Kato

Hello Xu-san,

I would be grateful if you could let me have your answer concerning this matter.

Best Regards,
Kato

Hi Monet, could you help Kato-San in this case.

Hi Junya,

did you solve this problem? Sorry for my missing.

The fluctuation range increase as VF increase. I notice that the current peak appears when the turning on LED change from Red to Green.

If the problem is still unsolved, could you provide the L and Cout parameters?

Best Regard

Monet Xu

Hello Xu-san,

This issue has not been resolved yet.
I don't understand why the fluctuation of Vout is the largest when the red LED with the smallest VF is lit.
L and Cout are as follows, respectively.

L=10uH,3A
Cout=22uF

Best Regards,
Kato