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| TLC5973 Datasheet, PDF (24/34 Pages) Texas Instruments – TLC5973 3-Channel, 12-Bit, PWM Constant-Current LED Driver with Single-Wire Interface (EasySet) | |||
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TLC5973
SBVS225B â MARCH 2013 â REVISED MAY 2014
www.ti.com
9.2.2 No Internal Shunt Regulator Mode 2
This application does not use the shunt regulator. However, the device VCC and LED lamp anode voltage are
supplied from different power supplies.
LED
Lamp
Power
Supply
VLED
Device and
Controller
Power
Supply
Controller
VCC
GND
RIREF
GND
IREF
Device
SDI
VCC
OUT0
OUT1
OUT2
SDO
Optional
RIREF
GND
IREF
Device
SDI
VCC
OUT0
OUT1
OUT2
SDO
Optional
Figure 24. No Internal Shunt Regulator Mode 2 Typical Application Circuit
9.2.2.1 Design Requirements
Table 5. Design Parameters
DESIGN PARAMETER
Input voltage range for VCC
Input voltage range for LED lamp
SDI voltage range
SDI data frequency
EXAMPLE VALUE
3.0 V to 5.5 V
LED forward voltage (VF) Ã the number of LED lamps + 1 V;
maximum voltage is 24 V
Low level = GND, high level = VCC
100 kbps to 3 Mbps
9.2.2.2 Detailed Design Procedure
The OUTn (n = 0 to 2) constant output current is set by an external resistor connected between the device IREF
and GND pins. Use Equation 1 to calculate the requirements for RIREF.
24
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