A8507 데이터 시트보기 (PDF) - Allegro MicroSystems
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A8507 Datasheet PDF : 16 Pages
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A8507
LED Backlight Driver for LCD Monitors and Televisions
90
80
70
60
50
40
30
20
10
0
10
15
20
25
30
RISET (kΩ)
Figure 7. LED Current versus RISET
100
90
80
70
Uncompensated
60
Compensated (3 μs)
50
40
0.1
1
10
100
PWM Duty Cycle (%)
Figure 9. LED Current Accuracy versus PWM Duty Cycle,
LED Current Accuracy normalized to the 100% Current level,
VBAT = 12 V, 6 parallel strings with 9 series LEDs each, ILED = 55 mA
per channel fPWM = 200 Hz
1.034
1.033
1.032
1.031
1.030
1.029
1.028
1.027
--35 -20
0
20
40
60
80
Ambient Temperature (°C)
Figure 8. Switching Frequency versus Ambient Temperature
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
10 20 30 40 50 60 70 80 90 100
PWM Duty Cycle (%)
Figure 10. LED Current Matching Error versus PWM Duty Cycle,
VBAT = 12 V, 6 parallel strings with 9 series LEDs each, ILED = 55 mA
per channel, fPWM = 200 Hz
1050
950
850
750
650
550
450
350
250
50 60 70 80 90 100 110 120 130 140 150 160 170 180
RFSET(kΩ)
Figure 11. Switching Frequency versus RFSET
Allegro MicroSystems, Inc.
7
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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