TLC5970
SBVS140 –MARCH 2010
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ELECTRICAL CHARACTERISTICS (continued)
At VCC = 10 V to 36 V and TA = –40°C to +85°C. Typical values at VCC = 24 V, FB = 17 V, and TA = +25°C, unless otherwise
noted.
TLC5970
PARAMETER
LED DRIVER BLOCK
TEST CONDITIONS
MIN
TYP
MAX
UNIT
At OUT0 to OUT2 pins. OUTn are on,
DCn = BC = 7Fh,
VOUT = 1 V, RIREF = 1 kΩ
IOLC
Constant output current
Leakage output current
136
151
166
0.1
±3
mA
µA
%
At OUT0 to OUT2 pins. OUTn are off, DCn = 7Fh,
BC = 7Fh, VOUT = 17 V, RIREF = 1 kΩ
IOLKG
At OUT0 to OUT2 pins. OUTn are on,
DCn = BC = 7Fh,
VOUT = 1 V, RIREF = 1 kΩ
Constant-current error
(channel-to-channel)(1)
ΔIOLC
±0.5
At OUT0 to OUT2 pins. OUTn are on,
DCn = BC = 7Fh,
VOUT = 1 V, RIREF = 1 kΩ
Constant-current error
(device-to-device)(2)
ΔIOLC1
±3
±6
±2
%
OUT0 to OUT2 are on, DCn = BCn = 7Fh,
VOUT = 1 V, RIREF = 1 kΩ, VREG = 3.3 V to 5.5 V
ΔIOLC2
Line regulation(3)
±0.5
%/V
OUT0 to OUT2 are on, DCn = BCn = 7Fh,
VOUT = 1 V to 3 V, RIREF = 1 kΩ
ΔIOLC3
Load regulation(4)
±1
±2
%/V
V
VIREF
Reference voltage output
IREF0 to IREF2, RIREF = 1 kΩ
1.17
1.20
1.23
(1) The deviation of each output from the average of OUT0–OUT2 constant-current. Deviation is calculated by the formula:
IOUTn
D (%) =
- 1 ´ 100
(IOUT0 + IOUT1 + IOUT2
)
3
(2) The deviation of the OUT0–OUT2 constant-current average from the ideal constant-current value.
Deviation is calculated by the following formula:
(IOUT0 + IOUT1 + IOUT2
)
- (Ideal Output Current)
3
D (%) =
´ 100
Ideal Output Current
Ideal current is calculated by the formula:
1.20
IOUT(IDEAL) = 125 ´
RIREF
(3) Line regulation is calculated by this equation:
(IOUTn at VREG = 5.5 V) - (IOUTn at VREG = 3 V)
D (%/V) =
100
´
(IOUTn at VREG = 3.0 V)
5.5 V - 3 V
(4) Load regulation is calculated by the equation:
(IOUTn at VOUTn = 3 V) - (IOUTn at VOUTn = 1 V)
100
D (%/V) =
´
3 V - 1 V
(IOUTn at VOUTn = 1 V)
6
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