User Guide 035
UG035.0
June 15, 2015
Submit Document Feedback
13
FIGURE 15. EFFICIENCY vs LED CURRENT AT LX
FREQUENCY = 1.2MHz AT +
105°C vs V
IN
FIGURE 16. EFFICIENCY VS INPUT VOLTAGE AT LX
FREQUENCY = 1.2MHz
vs V
IN
FIGURE 17. CHANNEL-TO-CHANNEL CURRENT MATCHING, 600kHz vs V
IN
FIGURE 18. CURRENT LINEARITY vs LOW LEVEL PWM DIMMING
DUTY CYCLE vs V
IN
FIGURE 19. NORMALIZED LED CURRENT vs. DIMMING FACTOR,
(MEASURED AT I
LED
= 20mA)
Typical Performance Curves
(Continued)
EFFICIENCY (%)
LED CURRENT (A)
50
55
60
65
70
75
80
85
90
95
0
0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20
5V
12V
24V
26.5V
60
65
70
75
80
85
90
95
0
5
10
15
20
25
30
EFFECI
ENC
Y
(
%
)
V
IN
(V)
-40°C
+25°C
+105°C
CH
ANNEL MATCH
ING (%)
CHANNEL NUMBER
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
0
1
2
3
4
5
5V
12V
24V
26.5V
5V
12V
24V
26.5V
5V
12V
24V
26.5V
+25°C,
+105°C,
-40°C,
0
0.2
0.4
0.6
0.8
1.0
1.2
0
1
4
PWM DIMMING DUTY CYCLE (%)
2
3
5
6
12 V
IN
4.5 V
IN
CURRENT (m
A
)
NORMALIZE
D
LED CUR
RE
NT
0.00001
0.0001
0.001
0.01
0.1
1
0.00001
0.0001
0.001
0.01
0.1
1
DIMMING FACTOR
(PWM Reg Value x DC Reg Value) / (255 x 255)
