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.)
0V
LED-OPEN FAULT PROTECTION
(BRIGHTNESS = 100%, LED OPEN ON FB1)
MAX17061 toc14
V FB1
1V/div
LED-SHORT FAULT PROTECTION
(BRT = 100%, 2 LEDs SHORT ON FB1)
MAX17061 toc15
V FB1
5V/div
0V
I FB2
10V/div
0V
0V
V FB2
10V/div
0V
0mA
400 μ s/div
LINE TRANSIENT RESPONSE
(V IN = 12V → 19V, BRIGHTNESS = 100%)
MAX17061 toc16
V OUT
20V/div
I FB2
20mA/div
V OUT
20V/div
0mA
0mA
1ms/div
LINE TRANSIENT RESPONSE
(V IN = 19V → 12V, BRIGHTNESS = 100%)
MAX17061 toc17
I FB1
20mA/div
I FB2
20mA/div
V OUT
20V/div
0V
0V
V IN
10V/div
0V
0V
V IN
10V/div
0A
0mA
100 μ s/div
I L
1A/div
I FB1
20mA/div
0A
0mA
100 μ s/div
I L
1A/div
I FB1
20mA/div
LED CURRENT BALANCE
vs. INPUT VOLTAGE
1.0
0.6
0.2
-0.2
-0.6
-1.0
5
8
11
14
17
20
INPUT VOLTAGE (V)
_______________________________________________________________________________________
9
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