TLC5973 Datasheet, PDF (27/34 Pages) Texas Instruments – TLC5973 3-Channel, 12-Bit, PWM Constant-Current LED Driver with Single-Wire Interface (EasySet)

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TLC5973
SBVS225B – MARCH 2013 – REVISED MAY 2014
Table 7 shows the typical resistor value for several V_LED voltages. Note that the C_VCC value should be 0.1 μF.
Table 7. Resistor Example for Shunt Resistor versus LED Voltage⁽¹⁾
V_LED (V)
9
12
18
24
R_VCC (Ω)
270
510
1000
1500
RESISTOR WATTAGE (W)
0.04
0.07
0.15
0.22
(1) R_IREF is at 1.5 kΩ.
9.2.3.3 Application Curves
Six LEDs are connected in series to each output.
VLED (5V/div)
VCC (5V/div)
VOUTn (2V/div, Blue LED Connected)
VLED (5V/div)
VCC (5V/div, Shunt Regulator Voltage)
VOUTn (2V/div, Blue LED Connected)
V_LED = 21 V
SDI high = 6 V
SDI (2V/div)
R_IREF = 2.7 kΩ
R_VCC = 1.2 kΩ
GS data = 7FFh (50% on duty)
Figure 28. Internal Shunt Regulator Mode Waveform 1
V_LED = 21 V
SDI high = 6 V
SDI (2V/div)
R_IREF = 2.7 kΩ
R_VCC = 1.2 kΩ
GS data = 7FFh (50% on duty)
Figure 29. Internal Shunt Regulator Mode Waveform 2
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