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TL4242_10 Datasheet, PDF (4/14 Pages) Texas Instruments – ADJUSTABLE LED DRIVER
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TL4242
SLVS641A – APRIL 2008 – REVISED MAY 2009 .............................................................................................................................................................. www.ti.com
OUTPUT ELECTRICAL CHARACTERISTICS
over recommended operating free-air temperature range, VI = 13.5 V, RREF = 0.47 Ω, VPWM,H, TJ = –40°C to 150°C, all
voltages with respect to ground (unless otherwise noted)
PARAMETER
IQ
Output current
IQmax Output current limit
Vdr
Drop voltage
TEST CONDITIONS
VQ – VREF(1) = 6.6 V
VQ – VREF = 6.6 V, RREF = 1 Ω
VQ – VREF = 6.6 V, RREF = 0.39 Ω
VQ – VREF = 5.4 V to 7.8 V, VI = 9 V to 16 V
RREF = 0 Ω
IQ = 300 mA
MIN TYP MAX UNIT
357 376 395
168 177 185
mA
431 454 476
357 376 395
600
mA
0.35 0.7 V
(1) VQ – VREF equals the forward voltage sum of the connected LEDs (see Figure 3).
PWM INPUT ELECTRICAL CHARACTERISTICS
over recommended operating free-air temperature range, VI = 13.5 V, RREF = 0.47 Ω, VPWM,H, TJ = –40°C to 150°C, all
voltages with respect to ground (unless otherwise noted)
PARAMETER
VPWM,
H
VPWM,
L
IPWM,H
IPWM,L
tPWM,O
N
tPWM,O
FF
High-level PWM voltage
Low-level PWM voltage
High-level PWM input current
Low-level PWM input current
Delay time, turn on
Delay time, turn off
TEST CONDITIONS
VPWM = 5 V
VPWM = 0 V
70% of IQnom, See Figure 6
30% of IQnom, See Figure 6
MIN TYP MAX UNIT
2.6
V
0.7 V
220 500 µA
–1
1 µA
0
15
40 µs
0
15
40 µs
REFERENCE (REF) ELECTRICAL CHARACTERISTICS
over recommended operating free-air temperature range, VI = 13.5 V, RREF = 0.47 Ω, VPWM,H, TJ = –40°C to 150°C, all
voltages with respect to ground (unless otherwise noted)
VREF
IREF
PARAMETER
Reference voltage
Reference input current
TEST CONDITIONS
RREF = 0.39 Ω to 1 Ω
VREF = 180 mV
MIN TYP MAX UNIT
168 177 185 mV
–1 0.1
1 µA
STATUS OUTPUT (ST) ELECTRICAL CHARACTERISTICS
over recommended operating free-air temperature range, VI = 13.5 V, RREF = 0.47 Ω, VPWM,H, TJ = –40°C to 150°C, all
voltages with respect to ground (unless otherwise noted)
VIQL
VIQH
VSTL
ISTLK
PARAMETER
Lower status-switching threshold
Upper status-switching threshold
Low-level status voltage
Leakage current
TEST CONDITIONS
ST = L
ST = H
IST = 1.5 mA
VST = 5 V
MIN TYP MAX UNIT
15
25
mV
30
40 mV
0.4 V
5 µA
STATUS DELAY (D) ELECTRICAL CHARACTERISTICS
over recommended operating free-air temperature range, VI = 13.5 V, RREF = 0.47 Ω, VPWM,H, TJ = –40°C to 150°C, all
voltages with respect to ground (unless otherwise noted)
tSTHL
tSTLH
PARAMETER
Delay time, status reaction
Delay time, status release
TEST CONDITIONS
CD = 47 nF, ST H→L
CD = 47 nF, ST L→H
MIN TYP MAX UNIT
6
10
14 ms
10
20 µs
4
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