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| 型号： | A8513KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 19/25页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR AUTO BCKLGHT 16TSSOP |
| 特色产品： | Allegro A8513 LED Driver |
| 标准包装： | 1 |
| 拓扑： | PWM，SEPIC，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1.8MHz ~ 2.2MHz |
| 电源电压： | 4.5 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 620-1440-6 |
A8513
Step 4a: Determine the Duty Cycle:
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
then:
D (max) = 1 –
= 1 –
V IN (min)
V OUT(OVP) + V d
5V
22.32 V + 0.4 V
= 78%
(14)
L =
=
V IN (min)
Δ I L f SW
5V
0.18 A
D (max)
2 MHz
0.78 = 10.83 μ H
(18)
where V d is the voltage drop of the boost diode.
Step 4b: Determine the maximum and minimum input current to
the system. The minimum input current will dictate the inductor
value. The maximum current rating will dictate the current rating
of the inductor. Given I OUT = I LED = 120 mA:
Double-check to make sure the ? current ripple is less than
I IN (min):
I IN (min) > 1 / 2 Δ I L
0.19 A > 0.09 A
A good inductor value to use would be 10 μ H.
(19)
V OUT(OVP) I OUT
I IN (max) =
= 0.595 A
22.32 V 120 mA
=
(15)
V IN (min)
5 V 0.9
where η is efficiency. Next, calculate minimum input current, as
follows:
Step 4d: This step verifies that there is sufficient slope compensa-
tion for the inductor chosen. The required slope compensation
value for different frequencies is listed below:
f SW Slope Compensation
(MHz) (A/ μ s)
2 3.73
1 1.85
I IN (min) =
V OUT(OVP)
V IN (max)
I OUT
(16)
0.500
0.250
3.70
1.83
=
22.32 V
16 V
120 mA
0.9
= 0.19 A
Next insert the inductor value used in the design:
A good approximation of efficiency η can be taken from the effi-
ciency curves located in the data sheet. A value of 90% is a good
starting approximation.
STEP 4c: Determine the inductor value.
Δ I Lused =
=
V IN (min) D (max)
L used f SW
5V 0.78
10 μ H 2.0 MHz
= 0.20 A
(20)
To assure that the inductor operates in continuous conduction
Calculate the minimum required slope:
(1 – D (max))
mode the value of inductor should be set such that the ? inductor
ripple current is not greater than the average minimum input cur-
rent. A good inductor choice for inductor ripple current is 30% of
Required Slope (min) =
Δ I Lused 1 10 – 6
1
f SW
(21)
the maximum input current:
Δ I L = I IN (max) × 0.3
(17)
=
0.20 A
1
2.0 MHz
1 10 – 6
(1 – 0.78)
= 1.8 A/ μ s
= 0.595 A × 0.3 = 0.18 A
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8513KLYTR-1-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver |
| A8513KLYTR-2-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver |
| A8513KLYTR-3-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver |
| A8513KLYTR-T | 功能描述:IC LED DRVR AUTO BCKLGHT 10MSOP 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 |
| A8514 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A8514 is a multi-output white LED driver for small-size LCD backlighting. |
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