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参数资料
| 型号： | A8500EECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 10/16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
To indicate the end of a programming sequence, set the EN pin
high for a period, t HID , which is either (a) greater than 256 oscil-
lator periods when the SKIP pin is high, or (b) greater than 64
oscillator periods when SKIP is low. When the A8500 evaluates
Flexible WLED/RGB Backlight Driver
for Medium Size LCDs
shuts down with the LED x pins disabled. External PWM applied
to the PWM pin should be in the range of 100 to 400 Hz for
optimal accuracy.
the end of a programming sequence, it changes the current level
to match the existing count (per table 2). The counter is then reset
to 0 and begins counting pulses again at the next valid pulse.
If the EN pin, along with the PWM and APWM pins, is pulled
low for period greater than t SHDN , the A8500 shuts down. When
the IC enters shutdown, LED1 through LED8 and the boost
switch turn off after the t SHDN period. During t SHDN , the con-
verter continues to work in normal fashion.
When enabled through the EN pin, internal references ramp up
during the t HI(init) period. The boost converter starts with soft
start to limit input inrush current. During soft start, the boost
C1
C2
C3
V OUT
I OUT
V PWM
stage is peak current limited to 1 A. All enabled LED x sinks are
set to 1 / 16 of the set 100% current level, as V OUT and the volt-
age on the LED x pins increases. When all LED x pins reach the
regulation level of 0.5 V, the IC comes out of soft start, resuming
normal operation with 2 A current limit on boost and 100% cur-
Symbol
C1
C2
C3
t
t
Parameter
V OUT
I OUT
V PWM
time
Units/Division
5.00 V
100 mA
1.00 V
1.00 ms
rent through LED x pins. A typical step response in steady state is
shown in figure 5.
On/off Control (PWM) with an External PWM Signal on the
Figure 7. PWM pin dimming f PWM = 200 Hz, Duty Cycle =10%.
Waveform is captured with AC coupling. DC value is zero.
PWM Pin. When the PWM pin is pulled high with the EN and
APWM pins low, the A8500 turns on and all enabled LED x pins
sink 100% current. When the PWM pin is pulled low, the IC
180
160
f PWM (Hz)
EN
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1 1 2 3 4 5 6 7 8
9 10 11 12 13 14 15
140
120
100
500
100
80
60
40
I OUT
20
0
0
20
40 60
80
100
Duty Cycle (%)
Figure 5. Serial dimming response. The numbers indicate the
quantity of EN pulses at each step.
PWM
6 μ s
100% Current level
Figure 8. PWM pin dimming linearity.
I LEDx
Figure 6. Timing diagram for dimming using the PWM pin.
Shutdown (0 μ A)
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
10
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8501 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:2 MHz, 4 Channel100 mA WLED/RGB Driver |
| A85014-000 | 制造商:TE Connectivity 功能描述:POLYOLEFINS ETC - Bulk 制造商:TE Connectivity 功能描述:MIL-LT-1/2-6-FSP-CS7223 |
| A8501ELPTR-T | 功能描述:IC LED DRVR WT/RGB BKLGT 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| A8501KLPTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| A8502 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency |
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