Six-String WLED Driver with Integrated
Step-Up Converter
ELECTRICAL CHARACTERISTICS (continued)
(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
FB_ Minimum On-Time
CONDITIONS
MIN
400
TYP
MAX
700
UNITS
ns
FAULT PROTECTION
OVP Threshold Voltage
FB_ Overvoltage Threshold
FB_ Open Threshold Voltage
FB_ Check LED Source Current
FB_ Check LED Time
Overcurrent Fault Timer
Rising edge, typical hysteresis = 90mV
Latch-off timer
1.23
7
130
0.4
0.7
88
1.27
9
280
1.3
1.3
168
V
V
mV
mA
ms
μs
PWM CONTROL
PWM Input On-Time
400
ns
PWM Input Frequency Range
0.1
25
kHz
Note 1: Specifications are guaranteed by design, not production tested.
Typical Operating Characteristics
(Circuit of Figure 1. V IN = 12V, T A = +25 N C, unless otherwise noted.)
BOOST CONVERTER EFFICIENCY vs. INPUT VOLTAGE (V S )
(V OUT = 32V, I OUT = 120mA, BRIGHTNESS = 100%)
92
90
88
BOOST CONVERTER EFFICIENCY vs. BRIGHTNESS
(V S = 2V, V OUT = 32V, I OUT = 120mA AT 100%)
90
80
86
70
84
82
80
78
60
50
5
8
11
14
17
20
23
26
0
20
40
60
80
100
INPUT VOLTAGE (V)
BRIGHTNESS (%)
_______________________________________________________________________________________
5
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