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A8500 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 6 Page - Allegro MicroSystems

๋ถ€ํ’ˆ๋ช… A8500
์ƒ์„ธ๋‚ด์šฉ  Flexible WLED/RGB Backlight Driver for Medium Size LCDs
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์ œ์กฐ์‚ฌ  ALLEGRO [Allegro MicroSystems]
ํ™ˆํŽ˜์ด์ง€  http://www.allegromicro.com
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A8500 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 6 Page - Allegro MicroSystems

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Flexible WLED/RGB Backlight Driver
for Medium Size LCDs
A8500
6
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
V
BAT (V)
5
8.5
17.6
I
LED(mA)
1
10
20
95
90
85
80
75
70
95
90
85
80
75
70
0
20
40
60
80
100
Duty Cycle (%)
95
90
85
80
75
70
65
4.5
4.7
4.9
5.1
5.3
5.5
VIN (%)
V
BAT (V)
5
8.5
17.6
100
90
80
70
60
50
40
30
0
20
40
60
80
100
Duty Cycle (%)
V
BAT (V)
5
8.5
17.6
100
90
80
70
60
50
40
30
0
20
40
60
80
100
Duty Cycle (%)
V
BAT (V)
5
8.5
17.6
0
20
40
60
80
100
Duty Cycle (%)
APWM Efficiency
VIN= 5 V, 6 ch. with 7 LEDs per ch., 20 mA per ch., fSW = 1 MHz
APWM Efficiency
VIN= 5 V, 6 ch. with 7 LEDs per ch., 20 mA per ch., fSW = 2 MHz
Efficiency versus Input Voltage with EN Dimming
VIN= VBAT, 8 ch. with 8 LEDs per ch., fSW = 1 MHz
Performance Characteristics
Efficiency with EN dimming is similar to that with APWM dimming. APWM light load
efficiency can be improved by reducing boost switching frequency with SKIP set high.
PWM Efficiency
VIN= 5 V, 6 ch. with 7 LEDs per ch., 20 mA per ch., fSW = 1 MHz
PWM Efficiency
VIN= 5 V, 6 ch. with 7 LEDs per ch., 20 mA per ch., fSW = 2 MHz


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