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| 型号： | A8504EECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/19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 |
| 输出电压： | 47V |
| 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： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1215-6 |
A8504
Typical Application Circuits
WLED/RGB Backlight Driver for Medium Size LCDs
A typical application circuit for dimming an LCD monitor back-
light with multiple LED strings is shown in figure 1. Figure 8
ISET
shows two dimming methods: digital PWM control (PWM signal
on the PWM pin) and analog PWM control, with the a nalog sig-
nal, V A , applied to the ISET pin through a resistor, RA.
The current flowing through RA can be calculated as:
RISETP
RISET
Q1
I A = V A / R A .
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 100 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 45 mA, and then it can be
Figure 9. Configuration for 1000:1 dimming.
100
95
90
85
80
dimmed by applying 100% to 0.25% duty cycle on the PWM pin.
The reference current can be reduced by turning off Q1. LED
current can be dimmed to 18 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 10 shows the accuracy, Err LEDX , results using this
circuit.
Figure 10. Typical accuracy, normalized to the 100% current level,
versus dimming level, with F PWM = 100 Hz.
V IN
5 V ±10%
C IN
V BAT
24 V
ROVP
COUT
V OUT
PWM
SKIP
VIN
SW SW
OVP
GND
AGND
PGND
COMP
FSET
ISET
LED1
C C
RFSET
RA
V A
RISET
A8504
SEL3
SEL2
SEL1
LED2
LED3 LED5 LED7 LGND LED8 LED6 LED4
V IN
Figure 8. Typical application circuit for PWM dimming, using digital PWM (on the PWM pin).
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1 . 508.853.5000; www.allegromicro.com
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8507 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:LED Backlight Driver for LCD Monitors and Televisions |
| A8507ELBTR-T | 功能描述:IC DRIVER WLED/RGB 24-SOIC 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 |
| A8507ELPTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 24TSSOP 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 |
| A8508 | 制造商:ROCKWE 功能描述: |
| A8508GLPTR-T | 功能描述:IC LED DVR WHITE 8X120MA 24TSSOP 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 |
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