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| TLC5970 Datasheet, PDF (6/48 Pages) Texas Instruments – 3-Channel, 12-Bit, PWM LED Driver with Buck DC/DC Converter and Differential Signal Interface | |||
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TLC5970
SBVS140 â MARCH 2010
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
At VCC = 10 V to 36 V and TA = â40°C to +85°C. Typical values at VCC = 24 V, FB = 17 V, and TA = +25°C, unless otherwise
noted.
TLC5970
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
LED DRIVER BLOCK
IOLC
IOLKG
ÎIOLC
ÎIOLC1
ÎIOLC2
ÎIOLC3
VIREF
Constant output current
Leakage output current
Constant-current error
(channel-to-channel) (1)
Constant-current error
(device-to-device) (2)
Line regulation(3)
Load regulation(4)
Reference voltage output
At OUT0 to OUT2 pins. OUTn are on,
DCn = BC = 7Fh,
VOUT = 1 V, RIREF = 1 kΩ
At OUT0 to OUT2 pins. OUTn are off, DCn = 7Fh,
BC = 7Fh, VOUT = 17 V, RIREF = 1 kΩ
At OUT0 to OUT2 pins. OUTn are on,
DCn = BC = 7Fh,
VOUT = 1 V, RIREF = 1 kΩ
At OUT0 to OUT2 pins. OUTn are on,
DCn = BC = 7Fh,
VOUT = 1 V, RIREF = 1 kΩ
OUT0 to OUT2 are on, DCn = BCn = 7Fh,
VOUT = 1 V, RIREF = 1 kΩ, VREG = 3.3 V to 5.5 V
OUT0 to OUT2 are on, DCn = BCn = 7Fh,
VOUT = 1 V to 3 V, RIREF = 1 kΩ
IREF0 to IREF2, RIREF = 1 kΩ
136
151
±0.5
166 mA
0.1
µA
±3
%
±3
±6
%
±0.5
±2 %/V
±1
±2 %/V
1.17
1.20
1.23
V
(1) The deviation of each output from the average of OUT0âOUT2 constant-current. Deviation is calculated by the formula:
D (%) =
IOUTn
- 1 ´ 100
(IOUT0 + IOUT1 + IOUT2)
3
(2) The deviation of the OUT0âOUT2 constant-current average from the ideal constant-current value.
Deviation is calculated by the following formula:
D (%) =
(IOUT0 + IOUT1 + IOUT2)
- (Ideal Output Current)
3
Ideal Output Current
´ 100
Ideal current is calculated by the formula:
IOUT(IDEAL) = 125 ´
1.20
RIREF
(3) Line regulation is calculated by this equation:
(IOUTn at VREG = 5.5 V) - (IOUTn at VREG = 3 V)
100
D (%/V) =
´
(IOUTn at VREG = 3.0 V)
5.5 V - 3 V
(4) Load regulation is calculated by the equation:
D (%/V) =
(IOUTn at VOUTn = 3 V) - (IOUTn at VOUTn = 1 V)
(IOUTn at VOUTn = 1 V)
100
´
3V-1V
6
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Copyright © 2010, Texas Instruments Incorporated
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