ISL97672A
Typical Performance Curves
100
(Continued)
0.40
90
80
70
60
+25°C
+85°C
0°C
- 40°C
0.30
0.20
0.10
50
40
30
20
10
0.00
-0.10
-0.20
-0.30
4.5 V IN
21 V IN
12 V IN
0
0
5
10
15
20
25
30
-0.40
0
1
2
3
4
5
6
7
V IN
FIGURE 7. EFFICIENCY vs V IN vs TEMPERATURE AT 20mA (100%
LED DUTY CYCLE)
1.2
CHANNEL
FIGURE 8. CHANNEL-TO-CHANNEL CURRENT MATCHING
0.60
1.0
0.8
4.5 V IN
0.55
+25°C
-40°C
0.6
12 V IN
0.50
0°C
0.4
0.45
0.2
0
0
1
2 3
4
5
6
0.40
0
5
10
15
20
25
30
V_OUT
V_EN
PWM DIMMING DUTY CYCLE (%)
FIGURE 9. CURRENT LINEARITY vs LOW LEVEL PWM DIMMING
DUTY CYCLE vs V IN
V O = 50mV/DIV
2.00μs/DIV
FIGURE 11. V OUT RIPPLE VOLTAGE, V IN = 12V, 6P12S AT
20mA/CHANNEL
7
V IN (V)
FIGURE 10. V HEADROOM vs V IN vs TEMPERATURE AT 20mA
V_OUT
V_EN
V_LX
I_INDUCTOR
FIGURE 12. START UP WAVEFORMS AT V IN = 6V FOR 6P12S AT
20mA/CHANNEL
FN7710.3
November 22, 2013
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