STEVAL-TLL012V1 STMicroelectronics

STEVAL-TLL012V1 4-channel LED driver with charge pump based on the STP4CMP Data brief Features Operating voltage range: 2.7 V to 5.5 V Full RGB function support 4-channel LED driver with individual ON/OFF control directly from input pins Individual programmable output current for the 4 channels through 4 external resistors with a max. capability of 30 mA Absolute output current accuracy of max. 7% and channel-to-channel mismatch of max. 4% Selectable charge pump enable/disable Thermal protection RoHS compliant Description The STEVAL-TLL012V1 demonstration board demonstrates the performance of the STP4CMP, a charge pump based 4-channel LED driver designed for RGB illumination or LCD display backlighting. This device works off a battery with an input voltage between 2.7 V - 5.5 V. The device generates regulated current sinks with high absolute and channel-to-channel accuracy to drive up to 4 LEDs. It can support LEDs with forward voltage as high as 3.8 V. The current sink for each channel can be set with 4 individual external resistors. Each channel is controlled independently. The PWM control can be applied directly to the 4 EN (enable) inputs to provide brightness control. June 2012 Doc ID 023248 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4Schematic diagram STEVAL-TLL012V1 1 Schematic diagram Figure 1. Schematic diagram . /. / 0 /. /54 6 /. /54 6 ) 3%4 2 3%4 ) 3%4 2 3%4 ) 3%4 2 3%4 ) 3%4 2 3%4 . 30 EL - V 2/4 Doc ID 023248 Rev 1 ,% ,% ,% ,% ,% ,% ,% ,% %.