Tool/software:
We need to drive an RGB three-color lamp and be able to dimmer. The parameters of the three lamps are 3.5V/4A, and VIN is 12V input. Now we want to dimmer the RGB three-color lamp with LM3409 and a MOS tube circuit similar to DLP5530EVM, and the PWM signal is given by our MCU/SOC. Could you please tell me the specific design of the peripheral circuit of LM3409, such as the EN pin input PWM, how to connect the IADJ pin, how to connect other pins, what are the important precautions? Do you have any reference design for me?
In addition, what is the difference and use of PWM dimming and analog dimming? In this application, I need two dimming methods to be considered, because I understand that the peripheral circuit design of the two dimming methods is not the same.
In addition, if the Qg of PFET is greater than 30nC, should VCC be connected to CSN? Instead of getting VIN.
