TLC5970 Datasheet, PDF (47/48 Pages) Texas Instruments – 3-Channel, 12-Bit, PWM LED Driver with Buck DC/DC Converter and Differential Signal Interface

TLC5970
www.ti.com
SBVS140 – MARCH 2010
The TLC5970 can be used to drive several LED lamps for small-current LEDs with the master-slave operation
mode (Figure 38). In this operating mode, BC data and DC data in the master device should not be set to '0' to
hold the LED anode (FB) voltage.
Power
Supply
VCC
GND
0.01 mF
0.1 mF
Controller
SDTY
SDTZ
SDKY
SDKZ
Open
GND
SWOFF
VREG
VREGIF
IREF2
IREF1
IREF0
VROM
SDTA
SDTB
SCKA
SCKB
VCC
PH _{0.01 mF}
BOOT
FB
OUT2
OUT1
OUT0
SDTY
SDTZ
SCKY
SCKZ
0.01 mF
0.1 mF
Open
GND
SWOFF
VREG
VREGIF
IREF2
IREF1
IREF0
VROM
SDTA
SDTB
SCKA
SCKB
VCC
PH
BOOT
FB
OUT2
OUT1
OUT0
SDTY
SDTZ
SCKY
SCKZ
TLC5970
TLC5970
Figure 38. Master/Slave Operating Mode
Open
Open
The TLC5970 can be used as a 5 V single power-supply LED without a buck converter operating mode, as
shown in Figure 39.
Power
Supply
(5V)
VCC
GND
Controller
SDTY
SDTZ
SDKY
SDKZ
Open
GND
SWOFF
VREG
VREGIF
IREF2
IREF1
IREF0
VROM
SDTA
SDTB
SCKA
SCKB
VCC
PH
BOOT
FB
OUT2
OUT1
OUT0
SDTY
SDTZ
SCKY
SCKZ
Open
Open
Open
GND
SWOFF
VREG
VREGIF
IREF2
IREF1
IREF0
VROM
SDTA
SDTB
SCKA
SCKB
VCC
PH
BOOT
FB
OUT2
OUT1
OUT0
SDTY
SDTZ
SCKY
SCKZ
TLC5970
TLC5970
Figure 39. No Buck Converter Operating Mode
Open
Open
Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): TLC5970
Submit Documentation Feedback
47