8-String White LED Driver with
SMBus for LCD Panel Applications
Typical Operating 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, LEDs =
10 series x 4 parallel strings, T A = +25°C, unless otherwise noted.)
SWITCHING WAVEFORMS
(V IN = 7V, BRIGHTNESS = 100%)
MAX17061 toc08
V LX
20V/div
0V
SWITCHING WAVEFORMS
(V IN = 20V, BRIGHTNESS = 100%)
MAX17061 toc09
V LX
20V/div
0V
I L
200mA/div
I L
200mA/div
1 μ s/div
STARTUP WAVEFORMS
(BRIGHTNESS = 100%)
MAX17061 toc10
0mA
V LX
20V/div
1 μ s/div
STARTUP WAVEFORMS
(SMBus = 0x04)
MAX17061 toc11
0mA
V LX
20V/div
0V
0A
I L
1A/div
0V
0A
I L
1A/div
0V
0V
0V
0mA
0mA
0V
400 μ s/div
LED CURRENT WAVEFORMS
(SMBus = 0x80)
MAX17061 toc12
2ms/div
V OUT
20V/div
V CCV
2V/div
V FB1
10V/div
I LED
20mA/div
I L
500mA/div
V OUT
20V/div
0V
0V
0V
0mA
0mA
0V
400 μ s/div
LED CURRENT WAVEFORMS
(SMBus = 0x04)
MAX17061 toc13
2ms/div
V OUT
20V/div
V CCV
2V/div
V FB1
10V/div
I LED
20mA/div
I L
500mA/div
V OUT
20V/div
8
_______________________________________________________________________________________
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