LM3431_08 Datasheet, PDF (5/24 Pages) National Semiconductor (TI) – 3-Channel Constant Current LED Driver with Integrated Boost Controller

Symbol
bw
V_LEDOFF
V_DIM
T_DIM
DIM_{DLY_R}
DIM_{DLY_F}
TH_MODE/F
I_MODE/F
V_{MODE_L}
V_{MODE_H}
Protection
V_{SC_SHORT}
V_{SC_OPEN}
I_{DLY_SC}
I_{DLY_SK}
V_DLY
V_{DLY_reset}
T_{DLY_BLK}
V_THM
I_THM
I_ILIM
V_{AFB_max}
V_{AFB_UVP}
T_SD
Boost controller
V_CFB
I_CFB
CFB_TC
ΔV_CFB / ΔV_IN
I_SS/SH
V_{SS_END}
V_RT
F_SW
T_{on_min}
D_MAX
ILIM_gm
Vslope
I_{COMP_SC}
I_{COMP_SK}
EA_gm
R_LG
Parameter
SNSx amp bandwidth
LEDOFF voltage
DIM threshold
hysteresis
Minimum internal DIM pulse width
(Note 8)
DIM to NDRV delay time
DIM to NDRV delay time
MODE/F threshold
MODE/F source/sink current
MODE/F minimum voltage
MODE/F peak voltage
SC high threshold
SC open clamp voltage
DLY source current
DLY sink current
DLY threshold voltage
DLY reset threshold voltage
DLY blank time
THM threshold
THM hysteresis current
ILIM max source current
AFB overvoltage threshold
AFB undervoltage threshold
Thermal shutdown threshold
CFB voltage
CFB source current
CFB temperature coefficient
CFB Line regulation
SS/SH source current
SS/SH voltage
RT voltage
Switching Frequency
Minimum Switching Frequency
Maximum Switching Frequency
Minimum on time
Maximum duty cycle
ILIM amplifier transconductance
Slope compensation
COMP source current
COMP sink current
Error amplifier transconductance
Gate Drive On Resistance
I_LG
Driver Output Current
Conditions
At unity gain
DIM low
MODE/F > 4V
DIM rising
DIM falling
For Digital Dimming control
Analog dimming mode
Analog dimming mode
Min Typ Max Units
2
MHz
5
V
1.9 2.3 V
0.8
V
0.4
µs
100
ns
90
ns
3.8
V
40
uA
0.37
V
2.5
V
LED short circuit fault, SC rising
LED open circuit fault, SC rising
DLY = 1.0V
DLY = 1.0V
DLY rising
DLY falling
DIM rising
THM = 1V
COMP = 2.0V
AFB falling
5.7 6 6.2 V
3.16 3.50 3.87 V
39 57 73 µA
1.8
µA
2.40 2.8 3.16 V
350
mV
1.6
µs
1.19 1.23 1.27 V
9.6
µA
31 40 46 µA
1.87 2.0 2.22 V
0.73 0.85 0.98 V
160
°C
DIM high
DIM high
5.5V < VIN < 36V
At EN going high
At end of soft-start cycle
R_RT = 34.8 kΩ
R_RT = 34.8 kΩ
R_RT = 130 kΩ
R_RT = 22.6 kΩ
COMP to ILIM gain
Peak voltage per cycle
VCOMP = 1.2V, AFB = 0.5V
VCOMP =1.2V, AFB = 1.5V
CFB to COMP gain, DIM high
Source Current = 200 mA, VIN = 5.5V
Sink Current = 200 mA
Source, LG = 2.5V, VIN = 5.5V
Sink, LG = 2.5V
1.60 1.71 1.82 V
35 50 65 µA
-2.6
mV/°C
0.001
%/V
13 19 24 µA
1.80 1.85 1.90 V
1.22
V
651 700 749 kHz
180 200 220
900 1000 1100
170 230 ns
80 85
%
85
umho
75
mV
155
µA
150
µA
230
umho
6.4
Ω
2.2
Ω
0.35
A
0.70
A
5
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