- 您现在的位置：买卖IC网 > Datasheet目录307 > A8513KLPTR-T (Allegro Microsystems Inc)IC LED DRVR AUTO BCKLGHT 16TSSOP Datasheet资料下载
参数资料
| 型号： | A8513KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 20/25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
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
For a stable system, the required minimum slope must be smaller
than the IC slope compensation.
200 Hz and the minimum duty cycle is 1%. Typically the voltage
variation on the output during PWM dimming must be less than
Note: The slope compensation value is in A/ μ s; the
constant multiplier.
1 × 10 -6
is a
250 mV (V COUT ) so that no audible noise can be heard. The
capacitance can be calculated as follows:
STEP 4e: Determine the inductor current rating :
f PWM(dimming) V
I L minimum rating = I IN (max) + 1 / 2 Δ I Lused
= 0.595 A + 0.20 A / 2 = 0.695 A
(22)
C OUT = I lkg
1 – D dimming (min)
COUT
(24)
Step 5: Choose the proper switching diode. The switching diode
should be chosen for three characteristics when it is used in LED
= 120 μ A
1 – 0.01
200 Hz 0.250 V
= 2.38 μ F
lighting circuitry. The first and most obvious are the current
rating of the diode and the reverse voltage rating. The reverse
voltage rating should be such that during operation condition the
voltage rating of the device is larger than the maximum output
voltage; in this case it is V OUT (OVP) . The peak current through
the diode is:
A capacitor larger than 2.38 μ F capacitor should be selected due
to degradation of capacitance at high voltages on the capacitor.
One ceramic 4.7 μ F, 50 V capacitor is a good choice to fulfill this
requirement. Corresponding capacitors include:
I dp = I IN (max) + 1 / 2 Δ I Lused
(23)
Vendor
Value
Part number
= 0.595 A + 0.20 A / 2 = 0.695 A
The third major component in deciding the switching diode is the
Murata
Murata
4.7 μ F 50 V
2.2 μ F 50 V
GRM32ER71H475KA88L
GRM31CR71H225KA88L
reverse current, I R , characteristic of the diode. This characteristic
is especially important when PWM dimming is implemented.
During PWM off-time the boost converter is not switching. This
results in a slow bleeding off of the output voltage, due to leakage
The rms current through the capacitor is given by:
? I L
I IN (max) 12
currents. I R can be a large contributor, especially at high tempera-
tures. On the diode that was selected in this design, the current
varies between 1 and 100 μ A.
Step 6: Choose the output capacitors. The output capacitors
I COUT rms = I OUT
D (max) +
1 – D (max)
(25)
0.78 +
should be chosen such that they provide filtering for both the
boost converter and for the PWM dimming function. The biggest
factors that contribute to the size of the output capacitor is PWM
dimming frequency and the PWM duty cycle. Another major
= 0.120 A
0.20 A
0.595 A
1 – 0.78
12 = 0.23 A
contributor is leakage current, I lkg . This current is a combination
of the OVP resistor divider, I OVP , and the reverse leakage of the
switching diode. In this design the PWM dimming frequency is
The output capacitor should have a current rating of at least
230 mA. The current rating of the 4.7 μ F, 50V capacitor is 1.5 A.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
20
相关PDF资料 |
PDF描述 |
|---|---|
| A8514KLPTR-T | IC LED DVR WHT 4X80MA 16-ETSSOP |
| A8515GLPTR-T | IC LED DVR WHT/RGB BKLGT 16TSSOP |
| A8516ELPTR-T | IC LED DVR BACKLIGHT MON 24TSSOP |
| A8740EEETR-T | IC PHOTOFLASH CAP CHARGER 8DFN |
| AC162049-2 | MOD PROGR UNIV MPLAB ICD2 ICD3 |
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. |
发布紧急采购，3分钟左右您将得到回复。