ZHCSQG6A March 2022 – May 2022 LP5891
PRODUCTION DATA
Decouple the VCC power supply voltage by placing a 0.1-μF ceramic capacitor close to VCC pin and GND plane. Depending on panel size, several electrolytic capacitors must be placed on the board equally distributed to get well regulated LED supply voltage VR/VG/VB. The ripple of the LED supply voltage must be less than 5% of their nominal value. Generally, the green and blue LEDs have the similar forward voltage, they can be supplied by the same power rail.
Furthermore, the VR > Vf(R) + 0.35 V (10-mA constant current example), the VG = VB > Vf (G/B) + 0.35 V (10-mA constant current example), here Vf(R), Vf(G/B) are representative for the maximum forward voltage of red, green/blue LEDs.
To simplify the power design, VCC can be connected to the VR power rail.