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TLC6946 Datasheet(PDF) 20 Page - Texas Instruments

Part No. TLC6946
Description  16-Channel 32-, 48-Multiplexing 16-Bit ES-PWM Constant-Current LED Driver
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TLC6946 Datasheet(HTML) 20 Page - Texas Instruments

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GCLK
VR
SCLK
FPS
f
m n f
f
N n 256 f
u u
u u
u
20
TLC6946, TLC6948
SLVSEB3A – JUNE 2018 – REVISED JANUARY 2019
www.ti.com
Product Folder Links: TLC6946 TLC6948
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Copyright © 2018–2019, Texas Instruments Incorporated
10.2.2
Detailed Design Procedures
10.2.2.1 Power Supply Voltage
The LED power supply voltage VLED must be higher than V(F) + V(KNEE). The device power supply voltage, VCC
should be equal or higher than VLED. One example value is VLED = VCC= 3.8 V. See TLC6946 Technical
Reference Manual for more details.
10.2.2.2 Channel Current and Brightness Control
See Global Brightness Control (BC) and Select RIREF for a Given BC. Select the reference-current-setting resistor
RIREF to set the maximum channel current for each color LED. Select the BC data for the best white balance of
the red, green, and blue LED lamp. See TLC6946 Technical Reference Manual for more details.
10.2.2.3 SCLK and GCLK Frequency
SCLK is the serial data shift-in clock signal; and GCLK is the PWM-control reference-clock signal. Equation 3
shows the minimum frequency requirement for GCLK and SCLK. See TLC6946 Technical Reference Manual for
more details.
where
fGCLK is the minimum GCLK frequency for single-edge operating mode
fSCLK is the minimum SCLK frequency
m is the GCLK number of each sub-period, determined by the PWM mode selected
fVR is the visual refresh rate of the entire cascading series
N is the number of cascaded TLC6948 devices
n is the number of scan lines
fFPS is the frame rate
(3)


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