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LM3645: LM3645 other feature recommendation

Part Number: LM3645

Tool/software:

Hi Team

I want to propose our LM3645 solution.

but some part may not meet their requirement as below. could you help me recommend it?

I just noticed this part doesn’t take 12V. I will need a DC/DC converter as the power source is 12V and this is not cost effective.

Is there something similar to this but takes a 12V input voltage?

 

By the way, can you tie 2 channels together such that a TOR pin can enable the LED on the assigned channel, overriding the other channel that is configured as normal LED output?

Will the brightness be same as 1 channel driving that LED on 100% PWM?

BRs

Brian