MAX16838B Datasheet, PDF (4/21 Pages) Maxim Integrated Products – Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller

MAX16838B
Integrated, 2-Channel, High-Brightness LED Driver
with High-Voltage Boost and SEPIC Controller
Electrical Characteristics (continued)
(V_IN = V_EN = 12V, R_RT = 12.2kΩ, R_ISET = 15kΩ, C_VCC = 1µF, V_CC = V_DRV = V_CFB, DRAIN, COMP, OUT_, FLT = unconnected, V_OV
= V_CS = V_LEDGND = V_DIM = V_PGND = V_SGND = 0V, V_GATE = V_NDRV, T_A = T_J = -40ºC to +125°C, unless otherwise noted. Typical
values are at T_A = 25°C.) (Note 2)
PARAMETER
LED CURRENT SINKS
OUT_ Current Range
LED Strings Current Matching
Output Current Accuracy
OUT_ Leakage Current
Current Foldback Threshold
Voltage
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
I_{OUT_} V_DIM = 5V, V_{OUT_} = 1.0V
20
150
mA
I_{OUT_} = 100mA, R_ISET = 15kΩ
±2
%
I_{OUT_} = 100mA,
T_A = +25ºC
97
100
103
mA
R_ISET = 15kΩ
T_A = -40ºC to +125ºC 95
100
105
mA
I_{OUT_} = 20mA,
R_ISET = 75kΩ
T_A = -40ºC to +125ºC 18.7
20
21.3
mA
V_DIM = 0V, V_{OUT_} = 40V
1
300
nA
1.23
V
CFB Input Bias Current
ENABLE COMPARATOR (EN)
Enable Threshold
Enable Threshold Hysteresis
Enable Input Current
DIM LOGIC
DIM Input Logic-High
DIM Input Logic-Low
Hysteresis
DIM Input Current
0 ≤ V_CFB ≤ 1.3V
V_ENHI
V_{EN_HYS}
V_EN rising
V_EN = 40V
V_IH
V_IL
V_{DIM_HYS}
I_DIM
V_DIM = 5V or 0
-0.3
+0.3
µA
1.1 1.24 1.34
V
71
mV
-500 +50 +700
nA
2.1
V
0.8
V
110
mV
-600
+100
nA
DIM to LED Turn-On Time
V_DIM rising edge to 90% of set current
50
290 1000
ns
DIM to LED Turn-Off Time
I_{OUT_} Rise Time
I_{OUT_} Fall Time
LED FAULT DETECTION
LED Shorted Fault Indicator
Threshold
LED String Shorted Shutoff
Threshold
Shorted LED Detection FLAG
Delay
V_DIM falling edge to 10% of set current
t_R
Rise time measured from 10% to 90%
t_F
Fall time measured from 90% to 10%
T_A = +125ºC
T_A = +125ºC
50
ns
120
600
ns
50
500
ns
3.1
5.5
3.55
4.2
4.85
V
6
9.5
6.8
7.7
8.6
V
6
µs
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