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参数资料
| 型号： | A8510GECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 13/33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 |
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A8510
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
The basic requirement of the SYNC signal is 150 ns minimum
on-time and 150 ns minimum off time, as indicated by the speci-
fications for t PWSYNCON and t PWSYNCOFF . Figure 10 shows the
timing for a synchronization clock into the A8510 at 800 kHz.
Thus any pulse with a duty cycle of 12% to 88% at 800 kHz can
be used to synchronize the IC.
The SYNC pulse duty cycle ranges for selected switching fre-
quencies are:
LED current setting and LED dimming
The maximum LED current can be up to 40 mA per channel, and
is set through the ISET pin. To set the I LED current, connect a
resistor, R ISET , between this pin and GND, according to the fol-
lowing formula:
R ISET = (1.003 × 327) / I LED (2)
where I LED is in mA and R ISET is in Ω . This sets the maximum
current through the LEDs, referred to as the 100% current . Stan-
dard R ISET values, at gain equals 327, are as follows:
SYNC Pulse Frequency
(kHz)
2200
2000
1000
800
600
Duty Cycle Range
(%)
33 to 66
30 to 70
15 to 85
12 to 88
9 to 91
Standard Resistor Value
Closest to R ISET
(k Ω )
8.25
10.5
13.0
16.2
LED current per LED, I LED
(mA)
40
30
25
20
If during operation a SYNC clock is lost, the IC will revert to the
preset switching frequency that is set by the resistor R FSET . Dur-
ing this period the IC will stop switching for a maximum period
of about 7 μ s to allow the sync detection circuitry to switch over
to the externally preset switching frequency.
If the clock is held low for more than 7 μ s, the A8510 will shut
down. In this shutdown mode the IC will stop switching, the
input disconnect switch is open, and the LEDs will stop sinking
current. To shutdown the IC into low power mode, the IC must be
disabled by keeping the EN/PWM pin low for a period of 32750
clock cycles. If the FSET/SYNC pin is released at any time after
7 μ s, the A8510 will proceed to soft start.
PWM dimming
The LED current can be reduced from the 100% current level
by PWM dimming using the EN/PWM pin. When the EN/PWM
pin is pulled high, the A8510 turns on and all enabled LEDs sink
100% current. When EN/PWM is pulled low, the boost converter
and LED sinks are turned off. The compensation (COMP) pin is
floated, and critical internal circuits are kept active. The typical
PWM dimming frequencies fall between 200 Hz and 1 kHz. Fig-
ures 12A to 12D provide examples of PWM switching behavior.
Another important feature of the A8510 is the PWM signal to
LED current delay. This delay is typically less than 500 ns, which
allows greater accuracy at low PWM dimming duty cycles, as
shown in figure 11.
t PWSYNCON
150 ns
950 ns
10
8
6
Worst-case
Typical
4
2
T = 1.25 μ s
150 ns
t PWSYNCOFF
0
0.1
1 10
PWM Duty Cycle, D (%)
100
Figure 10. SYNC pulse on and off time requirements, for an
800-kHz clock.
Figure 11. Percentage Error of the LED current versus PWM duty cycle
(at 200 Hz PWM frequency), for 500 ns delay.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
13
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 |
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