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| 型号： | A8500EECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHT/RGB BCKLGT 26QFN |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 200kHz ~ 2MHz |
| 电源电压： | 4.2 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 26-WFQFN 裸露焊盘 |
| 供应商设备封装： | 26-QFN/MLP-EP（4x4） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1142 (CN2011-ZH PDF) |
| 其它名称： | 620-1204-6 |
A8500
Flexible WLED/RGB Backlight Driver
for Medium Size LCDs
ELECTRICAL CHARACTERISTICS (continued) , valid at T A = –40°C to 85°C, typical values at T A = 25°C, V IN = 5 V, unless
otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
LED Current Sinks
LED x Regulation Voltage
V LED x
–
500
–
mV
I SET to I LED x Current Gain
Voltage on ISET Pin
I SET Allowable Current Range
LED x Accuracy
LED x Matching
LED x Switch Leakage Current
LEDx Switch Leakage Current
A ISET
V ISET
I SET
Err LED x
? LED x
I LSleak5
I LSleak21
I SET = 100 μ A
R ISET = 12 k Ω ; 100% current ratio,
measured as average of LED1 to LED8;
LED1 to LED8 = 0.5 V
I SET = 100 μ A , 100% current ratio;
LED1 to LED8 = 0.5 V
V LEDx = 5 V, EN = PWM = APW M = 0, T A = 25°C
V LEDx = 21 V, EN = PWM = APWM=0
–
–
40
–
–
–
–
210
1.23
–
±1.2
±1.5
–
1
–
–
120
–
–
1
–
–
V
μ A
%
%
μ A
μ A
Serial Pulse Timing (see figure 4 for further explanation)
EN Pulse Low Time
EN Pulse High Time
t LO
t HI
0.5
0.5
–
–
100
100
μ s
μ s
Initial EN or APWM Pulse High Time (rela-
tive to switching period)
Level Change Delay (relative to switching
period)
Shutdown Delay (relative to switching
period on EN or APWM)
t HI(init)
t HID
t SHDN
First EN or APWM pulse after
shutdown
Falling edge of EN or APWM
pulse
SKIP = Low
SKIP = High
SKIP = Low
SKIP = High
SKIP = Low
SKIP = High
–
–
–
–
–
–
256
64
256
64
256
64
–
–
–
–
–
–
Switching
Pulses
Switching
Pulses
Switching
Pulses
Switching
Pulses
Switching
Pulses
Switching
Pulses
Soft Start
Soft Start Boost Current Limit
Soft Start LED x Current Limit
Thermal Shutdown Threshold
I SWSS
I LEDSS
T SHDN
Initial soft start current for boos t switch
Current through enabled LED x pins during soft
start, R ISET =12 k Ω
40°C hysteresis
-
-
–
1
1.25
165
-
-
–
A
mA
°C
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5
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