TLC5970

TLC5970 www.ti.com 3-Channel, 12-Bit, PWM LED Driver with Buck DC/DC Converter and Differential Signal Interface Check for Samples: TLC5970 SBVS140 – MARCH 2010 FEATURES 1 23 3-Channel, Constant-Current Sink Output Current Capability: 150 mA per channel Grayscale (GS) Control with PWM: 12-bit (4096 steps) Dot Correction (DC): 7-bit (128 steps) Global Brightness Control (BC): 7-bit (128 steps) EEPROM for Dot Correction Storage Input Voltage: Up to 36 V LED Supply Voltage: Up to 17 V with Auto LED Anode Voltage Control Constant-Current Accuracy: – Channel-to-Channel = ±0.5% (typ) – Device-to-Device = ±3% (typ) Data Transfer Rate: 20 MHz Differential Signal Interface for Long Distance Cascading Unlimited Device Cascading Auto Display Repeat/Auto Data Refresh Internal/External Selectable GS Clock Thermal Shutdown (TSD) Packages: HTSSOP-32 and QFN-28 APPLICATIONS Full-Color Static LED Displays for Building Wall Long Distance and Large Area Illumination DESCRIPTION The TLC5970 is a three-channel, constant-current sink driver with a buck dc/dc converter and a differential signal interface. Each channel has individually adjustable currents with 4096 PWM grayscale (GS) steps and 128 constant-current sink steps for dot correction (DC). The dot correction adjusts the brightness variations between LEDs. The DC data can be stored in the internal EEPROM. Also, current through all three channels can be controlled by global brightness control (BC) data...