TLC5928

TLC5928 www.ti.com SBVS120E – JULY 2008 – REVISED JANUARY 2011 16-Channel, Constant-Current LED Driver with LED Open Detection Check for Samples: TLC5928 FEATURES 1 23 16 Channels, Constant-Current Sink Output with On/Off Control 35-mA Capability (Constant-Current Sink) 10-ns High-Speed Constant-Current Switching Transient Time Low On-Time Error LED Power-Supply Voltage up to 17 V VCC = 3.0 V to 5.5 V Constant-Current Accuracy: – Channel-to-Channel = ±1% – Device-to-Device = ±1% CMOS Logic Level I/O 35-MHz Data Transfer Rate 20-ns BLANK Pulse Width Readable Error Information: – LED Open Detection (LOD) – Pre-Thermal Warning (PTW) Operating Temperature: –40°C to +85°C APPLICATIONS LED Video Displays Message Boards Illumination DESCRIPTION The TLC5928 is a 16-channel, constant-current sink LED driver. Each channel can be turned on/off by writing serial data to an internal register. The constant-current value of all 16 channels is set by a single external resistor. The TLC5928 has two error detection circuits: one for LED open detection (LOD) and one for a pre-thermal warning (PTW). LOD detects a broken or disconnected LED and LEDs shorted to GND while the constant-current output is on. PTW indicates a high temperature condition. VLED VLED ¼ ¼ VLED VLED ¼ Controller DATA SCLK LAT BLANK ERROR READ RIREF ¼¼ ¼OUT0 OUT15 SIN SCLK SOUT VCC LAT BLANK TLC5928 IREF IC1 VCC GND RIREF ¼ ¼OUT0 OUT15 SIN SCLK SOUT VCC LAT BLANK TLC5928 ...