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| 型号： | A8500EECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 13/16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
Application Information
A typical application circuit for dimming an LCD monitor
backlight with 96 LEDs is shown in figure 1. Figure 12 shows
two dimming methods: digital PWM control (PWM signal on the
ISET
PWM pin) and analog PWM control, with the a nalog signal, V A ,
applied to the ISET pin through a resistor, RA.
The current flowing through RA can be calculated as:
I A = V A / R A .
RISETP
RISET
Q1
This current changes the reference current, I SET , as follows:
I SET = V SET / R SET – ( V A – V SET ) / R A .
LED current can be changed by changing V A . I SET can be
changed in the range from 40 μ A to 120 μ A.
Application Circuit for 1000:1 Dimming Level
A wider dimming range can be achieved by changing the refer-
ence current, I SET , while using PWM dimming. For higher output,
current levels turn on Q1. R ISET and R ISETP set the 100% current
level. This current level can be set to 25 mA, and then it can be
Figure 13. Configuration for 1000:1 dimming.
100
95
90
85
80
dimmed by applying 100% to 0.32% duty cycle on the PWM pin.
The reference current can be reduced by turning off Q1. LED
current can be dimmed to 8 mA by reducing reference current
75
0.1
1.0 10.0
Dimming Level (%)
100.0
through ISET pin. This provides 1000:1 combined dimming level
range. Figure 14 shows the accuracy, Err LEDX , results using this
circuit.
V IN
5 V ±10%
Figure 14. Typical accuracy, normalized to the 100% current level,
versus dimming level, with F PWM = 100 Hz.
ROVP
COUT
EN
PWM
APWM
SKIP
VIN
SW SW
OVP
AGND
PGND
COMP
FSET
ISET
LED1
C C
RFSET
RA
V A
RISET
A8500
SEL3
SEL2
SEL1
LED2
LED3 LED5 LED7 LGND LED8 LED6 LED4
V IN
Figure 12. Typical application circuit for PWM dimming, using digital PWM (on the
PWM pin, with APWM high).
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
13
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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PDF描述 |
|---|---|
| A8502KLPTR-T | IC LED DVR WHITE MULTI 16-TSSOP |
| A8504EECTR-T | IC LED DRVR WHT/RGB BCKLGT 26QFN |
| A8507ELBTR-T | IC DRIVER WLED/RGB 24-SOIC |
| A8508GLPTR-T | IC LED DVR WHITE 8X120MA 24TSSOP |
| A8509GLPTR-T | IC LED DVR WHITE 4X120MA 24TSSOP |
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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