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8-String WLED Driver with Integrated Step-Up
Regulator and SMBus/PWM Dimming Capability
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V IN = 12V, C COMP = 33nF, R COMP = 1k I , R ISET = 50k I , R OSC = 100k I , R DFSET = 250k I , PWMI = SGND,
C PWMO = 1μF, T A = 0 N C to +85 N C , unless otherwise noted. Typical values are at T A = +25 N C.)
PARAMETER
LX Current Limit
CONDITIONS
Duty cycle = 75% (Note 1)
MIN
2.4
TYP
2.9
MAX
3.4
UNITS
A
CONTROL INPUT
Logic-Input High Level
Logic-Input Low Level
SDA, SCL, PWMI, EN
SDA, SCL, PWMI, EN
2.1
0.8
V
V
INPUT LEAKAGE
PWMI Leakage Current
Logic Input Bias Current
OVP Leakage Current
SDA Output-Low Sink Current
T A = +25 N C
T A = +25 N C, EN, SDA, SCL
TA = +25 N C
V SDA = 0.4V
-0.1
-1
-0.1
4
+0.1
+1
+0.1
F A
F A
F A
mA
LED CURRENT
Full-Scale FB_ Output Current-
Adjustable Range (Note 4)
PWM-only dimming mode
SMBus-enabled dimming modes
R ISET = 33.3k I
15
15
29.1
30.0
30
25
30.9
mA
Full-Scale FB_ Output Current
ISET Output Voltage
R ISET = 50.0k I
R ISET = 66.6k I
V ISET < 0.4V
19.4
14.45
0.2
1.1
20.0
15.0
0.3
1.2
20.6
15.55
0.4
1.3
mA
V
Current Regulation Between
Strings
Minimum FB_ Regulation
Voltage
FB_ On-Resistance
FB_ Leakage Current
FB_ On-Time
I FB_ = 30mA
I FB_ = 20mA
I FB_ = 15mA
I FB_ = 30mA
I FB_ = 20mA
I FB_ = 15mA
V FB_ = 50mV
V FB_ = 40V, T A = +25 N C
-2.0
-2.0
-2.0
400
480
450
15
0.1
+2.0
+2.0
+2.0
770
26
5
%
mV
I
F A
ns
FAULT PROTECTION
OVP Threshold Voltage
Rising edge, hysteresis = 60mV
1.15
1.25
1.35
V
OVP Shutdown Voltage
OVP Global Fail
Rising edge
48
1.35
120
V
mV
FB_ UVLO Threshold
FB_ Overvoltage Threshold
FB open
140
7.4
220
8
300
8.6
mV
V
FB_ Check LED Source Current
FB_ Check LED Time
0.4
1
mA
ms
________________________________________________________________________________________
3
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