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8-String White LED Driver with
SMBus for LCD Panel Applications
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V IN = 12V, C CCV = 0.022μF, R CCV = 5.1k Ω , V ISET = V OSC = V DD = V CC , R FSET = 464k Ω , V PWMI = GND,
T A = -40°C to +85°C , unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
FAULT PROTECTION
OV Threshold Voltage
FB_ Overvoltage Threshold
FB_ Undervoltage Threshold
OV Undervoltage Threshold
(Boost Global Fail)
Overcurrent FAULT Shutdown Timer
FB_ Overvoltage Fault Timer
Rising edge, typical hysteresis = 60mV
I PEAK > 3.3A at duty = 0%
1.166
5.2
130
48
88
1.6
1.306
6.0
220
120
168
2.4
V
V
mV
mV
μs
ms
PWM FILTER
PWM Output Impedance
R FSET = 464k Ω
20
197
60
203
k Ω
kHz
DPWM Oscillator Frequency
R FSET = 113k Ω
750
820
Hz
PWMI Input Frequency Range
PWMI Full-Range Accuracy
R FSET = 65k Ω
PWMI duty cycle = 100%
1.27
5
98
1.40
100
5
kHz
kHz
LSB
PWMI Brightness Setting
PWMI duty cycle = 50%
PWMI duty cycle = 0%
48
2.6
52
2.8
%
SMBus TIMING SPECIFICATION
SMBus Frequency
Bus Free Time
START Condition Hold
Time from SCL
START Condition Setup
Time from SCL
STOP Condition Setup
Time from SCL
SDA Hold Time from SCL
SDA Setup Time from SCL
SCL Low Period
SCL High Period
FSMB
TBUF
THD:STA
TSU:STA
TSU:STO
THD:DAT
TSU:DAT
T LOW
T HIGH
10
4.7
4
4.7
4
300
250
4.7
4
100
kHz
μs
μs
μs
μs
ns
ns
μs
μs
Note 1: Specifications are guaranteed by design, not production tested.
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
6
_______________________________________________________________________________________
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