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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 = -40 N C to +85 N C , unless otherwise noted. Typical values are at T A = +25 N C.) (Note 2)
Note 1: Specifications are guaranteed by design, not production tested.
Note 2: Specifications to T A = -40 N C are guaranteed by design, not production tested.
Note 3: LED full-scale current maximum value is subjected to string number, LED number per string, and LX current limit. In SMBus
modes, if the total load is heavier than 8 strings with 10 WLEDs per string at 25mA LED current, upon step-up regulator
input V S removal, an OC fault may occur, resulting in SMBus status register OV_CURR and FAULT bits being set to 1 and
violating SMBus specifications.
Note 4: Minimum voltage drop from V S to IN pin, including the forward voltage drop of diode DIN1 used in Figure 1, should be no
less than 0.8V. If lower forward voltage drop diode is used, upon step-up regulator input V S removal, an OC fault may occur,
resulting in SMBus status register OV_CURR and FAULT bits being set to 1 and violating SMBus specifications.
Note 5: Dimming modes not to be done after the driver starts up or on-the-fly.
Typical Operating Characteristics
(T A = +25°C, unless otherwise noted.)
BOOST CONVERTER EFFICIENCY
vs. INPUT VOLTAGE (V S )
(V OUT = 32V/I OUT = 160mA, BRIGHTNESS = 100%)
91
BOOST CONVERTER EFFICIENCY
vs. BRIGHTNESS
(V S = 12V, V OUT = 32V/I OUT = 160mA AT 100%)
90
20
LED CURRENT
vs. BRIGHTNESS SETTING
90
89
88
87
80
70
15
10
86
84
WITHOUT EXTERNAL p-CHANNEL MOSFET
60
DirectPWM MODE WITHOUT
EXTERNAL p-CHANNEL MOSFET
5
DIRECT-PWM MODE
85
7
10
13
16
19
22
50
0
20
40
60
80
100
0
0
20
40
60
80
100
INPUT VOLTAGE (V)
BRIGHTNESS (%)
PWM DUTY CYCLE (%)
________________________________________________________________________________________
7
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