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参数资料
| 型号： | A8500EECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 9/16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
This current is multiplied internally with a gain of 210, and then
mirrored on all enabled LED x pins. This sets the maximum cur-
Flexible WLED/RGB Backlight Driver
for Medium Size LCDs
A8500 begins evaluating pulse patterns applied on the EN pin.
Until a valid series is evaluated, the count remains 0 and the
rent through the LEDs, referred to as “100% current.” The effects
of the value of R ISET are shown in figure 3.
The LED current can be reduced from 100% by any of three
alternative methods. These modes are:
? serial dimming through the EN pin,
? on/off control (PWM) with an external PWM signal on the
PWM pin, and
? analog dimming with an external PWM signal on the APWM pin .
Note: Only one dimming technique can be used at a time.
Serial Dimming Through the EN Pin. When the EN pin is pulled
high with PWM, and the APWM pin is low, the A8500 starts
up in serial programming mode. In this mode, series of pulses
default I LED x level remains at “100% current.” A count in the
range 1 to 15 is evaluated proportionately; for example, when
a series of 12 pulses is evaluated, I LED x is set to 25% (100% ×
4/16) of 100% current . At a 16th pulse, the counter resets to 0 and
continues to count if additional pulses are applied.
25
20
15
10
5
applied to the EN pin are used to adjust the output current level,
I LED x , to a proportion of the ISET current, in equal increments, as
listed in table 2.
0
0
10
20
(A)
30 40
R ISET (k Ω )
50
60
70
As shown in the timing diagram in figure 4, serial dimming is
disabled during startup, for the t HI(init) period. After that, the
212
Table 2. Serial D imming Levels
Pulse Count I LEDx
Pulse Count
I LEDx
211
210
209
V IN (V)
4.5
5.0
0
1
2
3
100%
100%×15/16
100%×14/16
100%×13/16
8
9
10
11
100%×8/16
100%×7/16
100%×6/16
100%×5/16
208
207
206
205
5.5
4
5
6
100%×12/16
100%×11/16
100%×10/16
12
13
14
100%×4/16
100%×3/16
100%×2/16
204
203
202
0
10
20
30
40
50
60
70
7
100%× 9/16
15
100%×1/16
(B)
R ISET (k Ω )
16*
*The counter resets on the sixteenth pulse.
100%
Figure 3. Effect of value of RISET on (A) “100% current” level, and
(B) LED x gain.
Pulses 0
t HI(init)
1
2
3
4
1
2
3
EN
t LO
t HID
t HI
t HID
t SHDN
I LEDX
100% as set by R ISET
100% ×1/16 level
Shutdown
Dimming
Counter
Reset
75%
Dimming
Counter
Reset
81.2%
Dimming
Counter
Reset
Figure 4. Timing diagram for serial dimming.
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
9
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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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