TLC5970
SBVS140 –MARCH 2010
www.ti.com
APPLICATION CIRCUITS
The TLC5970 can be used to increase the LED drive current for high-current LEDs with the high-current LED
operating mode (Figure 36) or with the parallel operating mode (Figure 37). In the parallel operating mode, the
external clock mode should be used to avoid flickering that can occur in an unsyncronized internal clock.
VCC
Power
Supply
GND
GND
VCC
PH
GND
VCC
PH
SWOFF
VREG
VREGIF
IREF2
IREF1
IREF0
VROM
SDTA
SWOFF
VREG
VREGIF
IREF2
IREF1
IREF0
VROM
SDTA
0.01 mF
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 36. High-Current LED Operating Mode
VCC
GND
Power
Supply
GND
VCC
PH
GND
VCC
SWOFF
VREG
VREGIF
IREF2
IREF1
IREF0
VROM
SDTA
SWOFF
VREG
VREGIF
IREF2
IREF1
IREF0
VROM
SDTA
PH
BOOT
FB
0.01 mF
0.01 mF
0.01 mF
0.1 mF
0.01 mF
0.1 mF
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 37. Parallel Operating Mode
46
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