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Six-String WLED Driver with Integrated
Step-Up Converter
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1. V IN = 12V, C COMP = 0.51nF, C COUT = 4.7μF, R COMP = 82.5k?, R ISET = 180k?, R FSLCT = 100k?, L = 10μH,
T A = -40°C to +85°C , unless otherwise noted. Typical values are at T A = +25°C.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V IN Input Voltage Range
V IN Quiescent Current
MAX17127 is enabled, V EN = 3.3V, V IN = 26V
MAX17127 is disabled, EN = AGND
MAX17127 is enabled, V EN = 3.3V,
5.4V < V IN < 26V, 0A < I VDDIO < 10mA
5
4.85
26
3.2
15
5.15
V
mA
μA
V DDIO Output Voltage
MAX17127 is enabled , V EN = 3.3V, V IN = 5V,
I VDDIO = 10mA, dropout condition
EN = AGND, 0A < I VDDIO < 50 F A
4.6
3.1
4.1
V
V DDIO Current Limit
V DDIO UVLO Threshold
V IN UVLO Threshold
V DDIO is forced to 4.2V
Rising edge, typical hysteresis = 250mV
Falling edge
Rising edge
25
3.90
4.3
4.55
70
4.10
4.7
4.95
mA
V
V
BOOST CONVERTER
SW On-Resistance
SW Leakage Current
20mA from SW to PGND
40V on SW, T A = +25 N C
0.25
1
ω
μA
Operating Frequency
R FSLCT Operative Range
R FSLCT = 100k I
R FSLCT = 400k I
0.95
0.225
90
1.05
0.28
500
MHz
kω
Maximum Duty Cycle
Boost Output Voltage
Minimum On-Time
At f SW = 1MHz
With suitable OVP network
(Note 1)
92
45
80
%
V
ns
CONTROL INPUT
PWM, EN Logic-Input High Level
PWM, EN Logic-Input Low Level
2.1
0.8
V
V
EN Pulldown Resistor
110
290
kω
FPO OUTPUT
FPO On Output-Voltage Low
I SINK = 1mA, fault active
0.4
V
LED CURRENT
R ISET = 120k I
29.1
30.9
Full-Scale FB_ Output Current
R ISET Range
Current Regulation Between
Strings
R ISET = 180k I
R ISET = 360k I
V ISET < 0.7V
Operating range
Accuracy = 3%
10mA < I FB _< 30mA
I FB_ = 30mA
19.4
9.7
0.2
100
120
-2.0
400
20.6
10.3
0.4
400
360
+2.0
770
mA
kω
%
Minimum FB_ Regulation Voltage I FB _= 20mA
I FB _= 10mA
670
630
mV
FB_ On-Resistance
FB_ Bias Current
V FB _= 50mV (includes 10 I sense resistor)
V FB _ = 40V, T A = +25 N C
28.4
1
ω
μA
4
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