- 您现在的位置：买卖IC网 > Datasheet目录307 > A8510GECTR-T (Allegro Microsystems Inc)IC LED DRVR BCKLGHT/WHT 26QFN-EC Datasheet资料下载
参数资料
| 型号： | A8510GECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 29/33页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR BCKLGHT/WHT 26QFN-EC |
| 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： | 白色 LED |
| 频率： | 600kHz ~ 2.25MHz |
| 电源电压： | 5 V ~ 40 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 ~ 105°C |
| 其它名称： | 620-1385-6 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页当前第29页第30页第31页第32页第33页
A8510
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
tions, due to stringent EMI requirements, the system must operate
then:
V OUT(OVP) + V d
V IN (min)
in continuous conduction mode throughout the whole input volt-
age range.
Step 4a Determining the duty cycle, calculated as follows:
D (max) = (34)
V IN (min) + V OUT(OVP) + V d
L =
=
Δ I L f SW
D (max)
5 (V)
0.339 (A) 800 (kHz)
0.765 = 14.1 μ H
(39)
= = 76.5%
15.9 (V) + 0.4 (V)
5 (V) + 15.9 (V) + 0.4 (V)
Step 4d Double-check to make sure the ? current ripple is less
than I IN (min):
Step 4b Determining the maximum and minimum input current
to the system. The minimum input current will dictate the induc-
tor value. The maximum current rating will dictate the current
rating of the inductor. First, the maximum input current, given:
I IN (min) > 1 / 2 Δ I L
0.353 A > 0.170 A
A good inductor value to use would be 15 μ H.
(40)
I OUT = # CHANNELS
I LED
(35)
Step 4e Next insert the inductor value used in the design to
then:
= 8
40 (mA) = 0.320 A
determine the actual inductor ripple current:
I IN (max) =
=
V OUT(OVP) I OUT
V IN (min)
15.9 (V) 0.32 (A)
5 (V) 0.90
= 1.131 A
(36)
Δ I Lused =
=
V IN (min) D (max)
L used f SW
5 (V) 0.765
15 ( μ H) 800 (kHz)
= 0.319 A
(41)
I IN (min) =
where η is efficiency.
Next, calculate minimum input current, as follows:
V OUT(OVP) I OUT
V IN (max)
(37)
Step 4f Determining the inductor current rating. The inductor
current rating must be greater than the I IN (max) value plus half of
the ripple current Δ I L , calculated as follows:
L (min) = I IN (max) + 1 / 2 Δ I Lused (42)
=
15.9 (V)
16 (V)
0.32 (A)
0.90
= 0.353 A
= 1.131 (A) + 0.160 (A) = 1.291 A
Step 5 Determining the resistor value for a particular switching
Step 4c Determining the inductor value. To ensure that the
inductor operates in continuous conduction mode, the value of
the inductor must be set such that the ? inductor ripple current
is not greater than the average minimum input current. As a first
pass assume I ripple to be 30% of the maximum inductor current:
frequency. Use the R FSET values shown in figure 6. For example,
a 25.5 k Ω resistor will result in an 800 kHz switching frequency.
Step 6 Choosing the proper switching diode. The switching
diode must be chosen for three characteristics when it is used in
Δ I L = I IN (max) × I ripple
= 1.131 × 0.30 = 0.339 A
(38)
LED lighting circuitry. The most obvious two are: current rating
of the diode and reverse voltage rating.
29
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
相关PDF资料 |
PDF描述 |
|---|---|
| A8511KLPTR-T | IC LED DVR 150MA AUTO 28-TSSOP |
| A8512ELBTR-T | IC LED DVR WHT/RGB BKLGT 24SOIC |
| A8513KLPTR-T | IC LED DRVR AUTO BCKLGHT 16TSSOP |
| A8514KLPTR-T | IC LED DVR WHT 4X80MA 16-ETSSOP |
| A8515GLPTR-T | IC LED DVR WHT/RGB BKLGT 16TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A8511 | 制造商:ROCKWE 功能描述: |
| A8511KLPTR-T | 功能描述:IC LED DVR 150MA AUTO 28-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 特色产品:LM3445 TRIAC Dimmable LED Driver 标准包装:55 系列:PowerWise® 恒定电流:是 恒定电压:- 拓扑:PWM，降压（降压） 输出数:1 内部驱动器:无 类型 - 主要:- 类型 - 次要:高亮度 LED（HBLED） 频率:30kHz ~ 1MHz 电源电压:8 V ~ 12 V 输出电压:- 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:管件 工作温度:-40°C ~ 125°C 产品目录页面:1285 (CN2011-ZH PDF) 其它名称:LM3445M |
| A8512 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:LED Backlight Driver for Medium/Large Displays |
| A8512EETTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 28QFN 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 |
| A8512ELBTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 24SOIC 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 |
发布紧急采购，3分钟左右您将得到回复。