Six-String WLED Driver with Integrated
Step-Up Converter
Typical Operating Characteristics (continued)
(Circuit of Figure 1. V IN = 12V, T A = +25 N C, unless otherwise noted.)
LED CURRENT vs. BRIGHTNESS SETTING
LED CURRENT (I LED = 20mA AT 100% BRIGHTNESS)
vs. INPUT VOLTAGE (V S )
20
15
10
5
0
f PWM = 200Hz
20.20
20.15
20.10
20.05
20.00
0
20
40
60
80
100
5
8
11
14
17
20
23
26
PWM DUTY CYCLE (%)
LED CURRENT (I LED = 20mA AT 10% BRIGHTNESS)
vs. INPUT VOLTAGE (V S )
2.04
6
INPUT VOLTAGE (V)
IN QUIESCENT CURRENT
vs. IN VOLTAGE
5
2.02
4
100% BRIGHTNESS
2.00
3
1.98
1.96
2
1
0
200Hz/1% BRIGHTNES S
5
8
11
14
17
20
23
26
5
7
11
14
17
20
23
26
INPUT VOLTAGE (V)
IN VOLTAGE (V)
10
8
6
4
2
IN SHUTDOWN CURRENT
vs. IN VOLTAGE
EN = LOW
SWITCHING WAVEFORMS
(V S = 5V, BRIGHTNESS = 100%)
MAX17127 toc08
V OUT = 32V, I OUT = 120mA
V LX
20V/div
0V
INDUCTOR
CURRENT
500mA/div
0mA
0
5
8
11
14
17
20
23
26
1μs/div
IN VOLTAGE (V)
6
______________________________________________________________________________________
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