8-String WLED Driver with Integrated Step-Up
Regulator and SMBus/PWM Dimming Capability
Typical Operating Characteristics (continued)
(T A = +25°C, unless otherwise noted.)
20
15
10
LED CURRENT
vs. SMBus BRIGHTNESS SETTING
20
15
10
LED CURRENT
vs. PWMI DUTY CYCLE
DPST MODE
SMBus = 255
5
0
SMBus MODE
5
0
SMBus = 128
0
50
100
150
200
250
0
20
40
60
80
100
25
SMBus BRIGHTNESS SETTING
LED CURRENT
vs. INPUT VOLTAGE
6
PWMI DUTY CYCLE
IN QUIESCENT CURRENT
vs. IN VOLTAGE
20
BRIGHTNESS = 100%
5
SMBus = 255
4
15
10
5
0
DIRECT-PWM MODE
BRIGHTNESS = 10%
3
2
1
0
SMBus = 0
7
10
13
16
19
22
7
10
13
16
19
22
INPUT VOLTAGE (V)
IN VOLTAGE (V)
35
IN SHUTDOWN CURRENT
vs. IN VOLTAGE
SWITCHING WAVEFORMS
(V S = 7V, BRIGHTNESS = 100%)
MAX17105 toc09
32
29
SMBus MODE
V LX
20V/div
0V
26
23
DIRECT-PWM MODE
INDUCTOR
CURRENT
500mA/div
0A
20
7
10
13
16
19
22
1 F s/div
IN VOLTAGE (V)
8
_______________________________________________________________________________________
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