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.)
LED-SHORT FAULT PROTECTION
(BRIGHTNESS = 100%, 3LEDs SHORT ON FB1)
MAX17105 toc16
V FB1
10V/div
0V
V FB2
5V/div
0V
I FB1
50mA/div
0A
0A
I FB2
50mA/div
400 F s/div
LINE-TRANSIENT RESPONSE
(V S = 9V 21V, BRIGHTNESS = 100%)
MAX17105 toc17
200 F s/div
V OUT
20V/div
0V
V S
10V/div
0V
INDUCTOR CURRENT
1A/div
0A
I FB1
20mA/div
0A
LINE-TRANSIENT RESPONSE
(V S = 21V 9V, BRIGHTNESS = 100%)
MAX17105 toc18
V OUT
20V/div
0V
V S
10V/div
0V
INDUCTOR CURRENT
1.6
1.2
0.8
LED CURRENT BALANCE
vs. BRIGHTNESS
1A/div
0A
I FB1
20mA/div
0A
0.4
0
DIRECT-PWM MODE
200 F s/div
10
20
30
40
50 60
70
80 90 100
BRIGHTNESS (%)
LED CURRENT BALANCE
vs. INPUT VOLTAGE
1.0
0.9
0.8
0.7
0.6
0.5
7
10
13
16
19
22
INPUT VOLTAGE (V)
10
______________________________________________________________________________________
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