Hi，
I met some problems when using LM3435, please help me to analyze it . Attached is the schematic diagram .
My design information is as follows：
-
The maximum current value per R/G/B channel is 176mA
- The RGB PWM is 120Hz, and the frame rate is suitable for the Lcos screen
-
Inductance is 4.7uH
- The power supply is lithium battery and the voltage is 3.4V~4.4V
My question is as follows：
1. I can hear the inductor scream . Is there any way to reduce or avoid the inductor scream?
2. The ripple of the power supply is very large, about 0.5V. Is there any way to reduce the ripple?
3. At low brightness levels, such as RGB at 100mA per channel, ray dithering is observed on the Lcos screen. Is there any way to avoid the ripple?
Best regards!
