ISL97678IRZ-T Просмотр технического описания (PDF) - Intersil
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ISL97678IRZ-T Datasheet PDF : 18 Pages
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ISL97678
Typical Performance Curves (Continued)
100
95
8P10S
90
85
80
12V/50mA
75
70
65
24V/50mA
60
55
50
45
40
35
30
0
10
20
30
40
50
ILED (mA)
FIGURE 5. EFFICIENCY vs ILED
95
50mA
94
8P11S
93
92
24V
91
90
89
88
87
12V
86
85
84
400
600 800 1k
1.2k 1.4k
SWITCHING FREQUENCY (Hz)
1.6k
FIGURE 6. EFFICIENCY vs SWITCHING FREQUENCY
1.0
20mA - 8P12S
0.8 50mA - 8P11S
0.6
0.4
12V/20mA
0.2
0.0
-0.2
-0.4
-0.6
12V/50mA
-0.8
-1.0
12345678
CHANNEL
FIGURE 7. CHANNEL-TO-CHANNEL CURRENT
MATCHING EXAMPLE
1.0
50mA
0.8 8P11
0.6
0°C
0.4
0.2
0.0
-0.2
-0.4
+25°C
+85°C
-0.6
-0.8
-40°C
-1.0
0
5
10
15
20
25
30
VIN (V)
FIGURE 8. CURRENT MATCHING vs VIN vs
TEMPERATURE
2.0
1.8
20mA - 8P12S
50mA - 8P11S
1.6
12V/50mA
1.4
1.2
24V/50mA
1.0
0.8
5V/20mA
0.6
0.4
24V/20mA
0.2
0.0
0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0
PWM DIMMING DUTY CYCLE (%)
FIGURE 9. CURRENT LINEARITY vs LOW LEVEL PWM
DIMMING DUTY CYCLE
2.0
20mA - 8P12S
1.8
12V/50mA 50mA - 8P11S
1.6
1.4
1.2
1.0
0.8
0.6
12V/20mA
0.4
0.2
HEADROOM CONTROL CHANNEL
0.0
12345678
CHANNEL
FIGURE 10. TYPICAL CHANNEL VOLTAGE EXAMPLE
8
FN6998.1
November 5, 2009
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