ISL97672AIRZ-T Datasheet, PDF (7/17 Pages) Intersil Corporation – 6-Channel LED Driver with Ultra Low Dimming Capability

ISL97672A
Typical Performance Curves (Continued)
100
90
80
70 ^+25°C
60
+85°C
0°C
50
-40°C
40
30
20
10
0
0
5
10
15
20
25
30
V_IN
FIGURE 7. EFFICIENCY vs V_IN vs TEMPERATURE AT 20mA (100% LED
DUTY CYCLE)
0.40
0.30
0.20
0.10
0.00
-0.10
4.5 V_IN
12 V_IN
-0.20
-0.30
21 V_IN
-0.40
0
1
2
3
4
5
6
7
CHANNEL
FIGURE 8. CHANNEL-TO-CHANNEL CURRENT MATCHING
1.2
1.0
0.8
4.5 V_IN
0.6
12 V_IN
0.4
0.2
0
0
1
2
3
4
5
6
DC
FIGURE 9. CURRENT LINEARITY vs LOW LEVEL PWM DIMMING
DUTY CYCLE vs V_IN
0.60
+25°C
-40°C
0.55
0.50
0°C
0.45
0.40
0
5
10
15
20
25
30
V_IN (V)
FIGURE 10. V_HEADROOM vs V_IN AT 20mA
V_O = 50mV/DIV
2.00µs/DIV
FIGURE 11. V_OUT RIPPLE VOLTAGE, V_IN = 12V, 6P12S AT
20mA/CHANNEL
V_IN = 6V, 6P12S
V_O = 20V/DIV
2.00µs/DIV
I_V_IN = 1A/DIV
ILED = 20mA/DIV
EN
FIGURE 12. IN-RUSH and LED CURRENT AT V_IN = 6V FOR 6P12S AT
20mA/CHANNEL
7
FN7710.2
May 2, 2011