Hi, I found a few problems when I tested the TPS92691-001 sepic EVM.
1.The maximum Iout=300mA at PWM dimming mode, while the guidebook shows the maximum Iout=500mA. Is there a limit to the range of Iout at PWM dimming mode? And what influence the limit?
I used an electronic load at CU (constant Uout) mode, and the Uout=7.5V to simulate LEDs.
2.The L2 inductance continued to make noises when using the PWM dimming. I input a PWM signal VPP=3V~5V, f=100hz~1KHZ according to the guide book, but the noises always existed. When the duty cycle was constant, reduced the PWM frequency and the noises reduced, too. And changing Uout didn't influence the noises.
thanks a lot