参数资料
型号: A8516ELPTR-T
厂商: Allegro Microsystems Inc
文件页数: 7/17页
文件大小: 0K
描述: IC LED DVR BACKLIGHT MON 24TSSOP
标准包装: 8,000
拓扑: PWM,升压(升压)
输出数: 6
内部驱动器:
类型 - 主要: 背光
类型 - 次要: RGB,白色 LED
频率: 300kHz ~ 1MHz
电源电压: 8 V ~ 24 V
安装类型: 表面贴装
封装/外壳: 24-TSSOP(0.173",4.40mm)裸露焊盘
供应商设备封装: 24-TSSOP 裸露焊盘
包装: 带卷 (TR)
工作温度: -40°C ~ 85°C
A8516
LED Backlight Driver for LCD Monitors and Televisions
Characteristic Performance
95
94
93
92
91
90
89
88
87
Efficiency versus Battery Voltage
for Various LED Configurations
FET = IRFR120N, V IN = 12 V, f SW = 500 kHz
L = 22 μ H, Load = W92050C LEDs at 112 mA per string
95
94
93
92
91
90
89
88
87
Efficiency versus Battery Voltage
for Various LED Configurations
FET = FQB17N08L, V IN = 12 V, f SW = 500 kHz
L = 22 μ H, Load = W92050C LEDs at 112 mA per string
86
85
84
83
82
81
80
3 strings 18 LEDs per string
V OUT ≈ 60 V, P OUT ≈ 20.2 W
2 strings 18 LEDs per string
V OUT ≈ 60 V, P OUT ≈ 13.4 W
3 strings 14 LEDs per string
V OUT ≈ 47 V, P OUT ≈ 15.8 W
2 strings 14 LEDs per string
V OUT ≈ 47 V, P OUT ≈ 10.5 W
86
85
84
83
82
81
80
3 strings 18 LEDs per string
V OUT ≈ 60 V, P OUT ≈ 20.2 W
2 strings 18 LEDs per string
V OUT ≈ 60 V, P OUT ≈ 13.4 W
3 strings 14 LEDs per string
V OUT ≈ 47 V, P OUT ≈ 15.8 W
2 strings 14 LEDs per string
V OUT ≈ 47 V, P OUT ≈ 10.5 W
10
11
12
13
14
15
16
17
18
19
20
21
22
23
10
11
12
13
14
15
16
17
18
19
20
21
22
23
V BAT (V)
Efficiency of the boost converter stage is affected by the selection of
power MOSFET, switching frequency, input/output voltages, and output
power. The external MOSFET used for the above chart is the IRFR120N,
which has a relatively high R DS(on) = 0.21 Ω . This causes higher
conduction loss, especially at lower input voltage.
V BAT (V)
The power MOSFET is replaced with FQB17N08L, which has a lower
R DS(on) = 0.115 Ω . This results in less conduction loss at lower input
voltage, however, the switching loss becomes more significant at higher
input voltage.
Switching Frequency versus FSET Resistor Value
f SW (MHz) = 52 / R FSET (k Ω )
1100
1000
900
800
700
600
500
400
300
50
60
70
80
90 100 110
120
130
140
150
R FSET (k Ω )
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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