TLC5970 Datasheet, PDF (46/48 Pages) Texas Instruments – 3-Channel, 12-Bit, PWM LED Driver with Buck DC/DC Converter and Differential Signal Interface

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.
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
BOOT
FB
0.01 mF
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 _{0.01 mF}
BOOT
FB
OUT2
OUT1
OUT0
SDTY
SDTZ
SCKY
SCKZ
TLC5970
TLC5970
Figure 36. High-Current LED Operating Mode
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
BOOT
FB
OUT2
OUT1
OUT0
SDTY
SDTZ
SCKY
SCKZ
TLC5970
0.01 mF
0.01 mF
0.1 mF
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
TLC5970
Figure 37. Parallel Operating Mode
46
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