1 Features

1• Three Constant Sink Current Channels

• Current Capability:

– 2 mA to 35 mA per Channel (VCC ≤ 4.0 V)

– 2 mA to 50 mA per Channel (VCC > 4.0 V)

• Grayscale (GS) Control with PWM:

– 12-Bit (4096 Steps)

• Single-Wire Interface (EasySet)

• Power-Supply (VCC) Voltage Range:

– 3 V to 6 V

• OUT Pins Maximum Voltage: Up to 21 V

• Integrated Shunt Regulator

• Data Transfer Maximum Rate:

– Bits per Second (bps): 3 Mbps

• Internal GS Clock Oscillator: 12 MHz (typ)

• Display Repeat Rate: 2.9 kHz (typ)

• Output Delay Switching to Prevent Inrush Current

• Unlimited Device Cascading

• Operating Temperature: –40°C to 85°C

2 Applications

This device is targeted towards one application.

The primary application for this device is for RGB

LED cluster lamp displays.

3 Description

The TLC5973 is an easy-to-use, 3-channel, 50-mA

constant sink current LED driver. The single-wire,

3-Mbps serial interface (EasySet) provides a solution

for minimizing wiring cost. The LED driver provides

12-bit pulse width modulation (PWM) resolution. The

display repeat rate is achieved at 2.9 kHz (typ) with

an integrated 12-MHz grayscale (GS) clock oscillator.

The driver also provides unlimited cascading

capability.

All output sink constant currents can be set by an

external resistor. The TLC5973 has an internal shunt

regulator that can be used for higher VCC powersupply

voltage applications.