[AK7864A] Block Diagram CP1 CPO VDD CPOUT LED_R LED_G LED_B (3.3V±5%) SW CONT_B SW CONT_G SW CONT_R CP Charge Current Pump EN Current CC Setting (VDD2) Source R 8 step CN Current Source G Current PDN Source B VSS IREF R 1% Circuit Block Description Charge Pump Circuit A necessary voltage for LED (Vf 4.8V or less) lighting is generated from the voltage supplied to VDD pin. Please supply the generated voltage from CPOUT pin to external LED. LED Driver Part This product has 3 channel LED driver to drive RGB constant current. Use the ON/ OFF digital terminal to control the constant current. The current setting can be set to 8 levels (100%/87.5%/75%/62.5%/50%/37.5%/25%/12.5%) with CONT_R/G/B and EN combination. The current of 3 channels are same. It is possible to light 1ch or 3ch simultaneously. Please set the LED current less than 50% by 3ch simultaneously. MS1336 - E - 00 2 2012/01
