Other Parts Discussed in Thread: TPS92640
I have been using parallel fet dimming with the LM3409 to drive 1A - 3A LED's at 30 khz pwm dimming, I tested several LED drivers and the LM3409 was the best performer at this high PWM freq, so I'm hesitant to try something else. My current driver is designed for and works great at 3.5 A max.
A new application is targeting one of the big chip LED's from luminous devices... these LED's are Vf= 5V at If = 20A. My first preference is to run 6 or more LM3409's in parallel. Has this been tested before? Any recommendations?
I would also consider any alternatives if there is a better low voltage, high current driver that can PWM at 30 khz.