To begin the design process, a few parameters must be decided upon. The designer needs to know the following:
- Maximum output constant-current value for each color LED ramp.
- Maximum LED forward voltage (VF).
- Current ratio of red, green, and blue LED lamps for the best white balance.
- Are the auto display repeat function, display timing reset function, or auto data refresh function used?
- Which PWM control method is used: ES-PWM or conventional PWM?
- Is the LED short detect (LSD) function used? If so, which detection level (70% VCC or 90% VCC) is used?