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.
VCC
Power
Supply
GND
GND
VCC
PH
GND
VCC
PH
Open
Open
SWOFF
VREG
VREGIF
IREF2
IREF1
IREF0
VROM
SDTA
SWOFF
VREG
VREGIF
IREF2
IREF1
IREF0
VROM
SDTA
0.01 mF
0.01 mF
0.1 mF
0.01 mF
0.1 mF
BOOT
FB
BOOT
FB
OUT2
OUT1
OUT0
SDTY
SDTZ
SCKY
SCKZ
OUT2
OUT1
OUT0
SDTY
SDTZ
SCKY
SCKZ
Controller
Open
Open
SDTY
SDTZ
SDKY
SDKZ
SDTB
SCKA
SCKB
SDTB
SCKA
SCKB
TLC5970
TLC5970
Figure 38. Master/Slave Operating Mode
The TLC5970 can be used as a 5 V single power-supply LED without a buck converter operating mode, as
shown in Figure 39.
VCC
Power
Supply
GND
(5V)
GND
VCC
PH
GND
VCC
PH
Open
Open
Open
Open
SWOFF
VREG
VREGIF
IREF2
IREF1
IREF0
VROM
SDTA
SWOFF
VREG
VREGIF
IREF2
IREF1
IREF0
VROM
SDTA
BOOT
FB
BOOT
FB
OUT2
OUT1
OUT0
SDTY
SDTZ
SCKY
SCKZ
OUT2
OUT1
OUT0
SDTY
SDTZ
SCKY
SCKZ
Controller
Open
Open
SDTY
SDTZ
SDKY
SDKZ
SDTB
SCKA
SCKB
SDTB
SCKA
SCKB
TLC5970
TLC5970
Figure 39. No Buck Converter Operating Mode
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