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-SHORT FAULT PROTECTION
(BRIGHTNESS = 100%, 3 LEDs SHORT ON FB1)
MAX17127 toc15
V FB1
10V/div
0V
I FB1
50mA/div
0mA
10μs/div
LINE-TRANSIENT RESPONSE
(V S = 9V 21V, BRIGHTNESS = 100%)
MAX17127 toc16
9V
21V
20mA
200μs/div
V OUT
(AC-COUPLED)
2V/div
0V
V S
10V/div
0V
0A
INDUCTOR
CURRENT
1A/div
I FB1
10mA/div
0mA
LINE-TRANSIENT RESPONSE
(V S = 21V 9V, BRIGHTNESS = 100%)
MAX17127 toc17
MAXIMUM UNBALANCE RATE BETWEEN STRING
vs. BRIGHTNESS (V S = 12V, I LED = 20mA)
1.0
21V
9V
0V
V OUT
(AC-COUPLED)
1V/div
V S
10V/div
0V
0.8
0.6
I FB(AVG)
20mA
0A
INDUCTOR
CURRENT
1A/div
I FB1
10mA/div
0mA
0.4
0.2
0
MAXIMUM = I FB_ ? I FB(AVG) MAX %
UNBALANCE RATE (%)
200μs/div
10
20
30
40
50
60
70
80
90 100
BRIGHTNESS (%)
MAXIMUM UNBALANCE RATE BETWEEN STRINGS
(I LED = 20mA) vs. INPUT VOLTAGE (V S )
0.8
0.7
0.6
0.5
0.4
I FB(AVG)
0.3
0.2
MAXIMUM = I FB_ ? I FB(AVG) MAX %
UNBALANCE RATE (%)
5
8
11
14
17
20
23
26
INPUT VOLTAGE (V)
8
______________________________________________________________________________________
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