- 您现在的位置：买卖IC网 > Datasheet目录307 > A8511KLPTR-T (Allegro Microsystems Inc)IC LED DVR 150MA AUTO 28-TSSOP Datasheet资料下载
参数资料
| 型号： | A8511KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 20/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR 150MA AUTO 28-TSSOP |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 高亮度 LED（HBLED），RGB，白色 LED |
| 频率： | 600kHz ~ 2.1MHz |
| 电源电压： | 8 V ~ 21 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 620-1367-6 |
A8511
2 MHz, 4 Channel×150 mA WLED/RGB Driver
With Output Disconnect
Application Information
Design Example
This section provides a method for selecting component values
when designing an application using the A8511.
Select a common value: 14.7 k Ω , 1%.
4. Select resistor RFSET (connected between pin FSET and
AGND). Given:
Assumptions For the purposes of this example, the following are
given as the application requirements:
R FSET = 51 /f SW ,
(7)
? V BAT : 8 to 18 V
? Quantity of LED channels, # CHANNELS : 3
? Quantity of series LEDs per channel, # SERIESLEDS : 8
? LED current per channel, I LED : 80 mA
? Total current all channels, I OUT = I LED × # CHANNELS
for a 2 MHz switching frequency, select:
R FSET = 51 / 2 = 25.5 k Ω , 1%.
5. Select resistor ROVP (connect to the OVP pin to set the
OVP level, V OUT (max)). Given V f (max) = 3.4 V, 0.75 V as
the V LED regulation level, and worst case output disconnect
switch voltage drop, then:
? V f at 80 mA: 3 to 3.4 V
? f SW : 2 MHz
V OUT (max) = ( V f (max) × # SERIESLEDS )
+ V LED + ( R ODS(on) × I LED × # CHANNELS ) .
(8)
? T A (max): 65°C
Dimming The A8511 can work with wide range of PWM fre-
quencies. A small delay between the PWM signal and the LED
current may have a noticeable effect at high PWM frequencies
combined with low PWM duty cycles. For example, at 100 Hz
and 10% PWM duty cycle, the PWM on-period is 1 ms. In that
period, the delay causes only a 0.6% error. If the PWM frequency
is 1 kHz, this error is 6%. However, the error caused by the turn-
on delay can be decreased by increasing the applied PWM duty
cycle as shown on page 10 in the Performance Characteristics
Substituting:
V OUT (max) = (3.4 × 8 + 0.75) + (4 × 0.08 × 3) = 28.91 V .
The switch resistance R ODS(on) can be found in the electri-
cal table and is listed as worst case at 4 Ω at high tempera-
tures. To set the output OVP level to 33 V, given an I OVPH of
200 μ A, and V OVP(th) = 19.5 V:
R OVP = ( V OVP – V OVP(th) ) / I OVPH . (9)
Substituting:
section.
R OVP = (33 – 19.5) / 200 × 10 -6 = 68 k Ω .
(10)
Procedure The procedure consists of selecting the appropriate
configuration and then the individual component values, in an
ordered sequence.
6. Select inductor L1. This should assume a maximum boost
converter duty cycle, D(max), at V BAT (min) and 90% ef-
ficiency, η .
1. Identify the SEL x pins to use. For 3 channels:
? connect pin SEL2 to V TO
? connect pin SEL1 to ground
2. Connect LEDs to pins LED1 through LED3 (leave pin LED4
open).
3. Select resistor RISET (connected between pin ISET and
AGND). Given I LED = 80 mA and A ISET = 960, then:
R ISET = 1.235 / (I LED / A ISET ) . (6)
Substituting:
D (max) = 1– ( V BAT (min) × η ) / V OUT (max)
D (max) = 1– (8 × 0.9) / 28.91 = 75% .
Then calculate maximum switch on-time:
t on (max) = D(max) / f SW
= 0.75 / 2 × 10 6 = 375 ns .
Maximum input current can be calculated as:
I BAT = ( V OUT (max) × I OUT ) / ( V BAT (min) × η )
(11)
(12)
(13)
R ISET = 1.235 / (0.080 / 960) = 14.82 k Ω .
I BAT (max) = [28.91 × (0.080 × 3)] / (8 × 0.9) = 963 mA.
8511-DS
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 |
|---|---|
| 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 |
| A8516ELPTR-T | IC LED DVR BACKLIGHT MON 24TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| A8512ELPTR-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 |
| A8513 | 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 |
发布紧急采购，3分钟左右您将得到回复。