- 您现在的位置：买卖IC网 > Datasheet目录307 > A8509GLPTR-T (Allegro Microsystems Inc)IC LED DVR WHITE 4X120MA 24TSSOP Datasheet资料下载
参数资料
| 型号： | A8509GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHITE 4X120MA 24TSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，SEPIC，升压（升压） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 300kHz ~ 800kHz |
| 电源电压： | 9 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 24-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 105°C |
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页当前第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
A8509
Wide Input Voltage Range, High Efficiency
4-Channel Fault Tolerant LED Driver
Boost switch overcurrent protection
The boost switch is protected with pulse-by-pulse current limiting
RSENSE
set by the external RSENSE resistor. There also is a secondary
current limit that is sensed on the boost switch.
Setting the current sense resistor
A8509
SENP
SENN
V SENP
R SENSE
The current sense resistor (see figure 18) is set according to the
following formula:
I LIM = (5)
where V SENP is found in the Electrical Characteristics table, and
R SENSE is the current sense resistor value.
Current
Sense
Figure 18. Simplified schematic of the current sense resistor connections
to the current sense amplifier.
I LIM = I IN (max) +
The current limit is calculated by the following formula:
? I L
2
(6)
A
RSENSE
A
GND
where I IN (max) is the maximum input current, and Δ I L is the
inductor current ripple.
B
SENN
A8509LP
Current sense resistor routing
The current sense resistor must be routed as a differential pair to
minimize measurement accuracy errors. For most current sense
resistors the resistance is measured between the inside edges of
the mounting pads of the RSENSE resistor.
Figure 19 shows correct differential current sensing connections
to the A8509. The individual current sense traces are kept short
and side-by-side to get proper signal voltage levels. The trace for
SENP
Figure 19. Correct layout of current sense resistor traces: (A) connect to
inside edges of pads, (B) parallel and dedicated
RSENSE
the positive sense pin (SENP) must be routed to the inside edge
of the mounting pad on the high side of RSENSE. The trace for
the negative sense pin (SENN) must be routed to the inside edge
of the mounting pad on the ground side of RSENSE.
It should be noted that when designing the PCB layout, the trace
A
SENN
B
A8509LP
GND
for the negative sense pin (SENN) is often automatically merged
with the ground flood fill and with the mounting pad on the
ground side of RSENSE (shown in figure 20). However, the trace
must be kept separate and dedicated, and careful attention must
be given when routing the PCB.
SENP
Figure 20. Incorrect layout of current sense resistor traces: (A) do not
connect to outside edge of pad, (B) do not merge trace into ground
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 |
|---|---|
| A8510GECTR-T | IC LED DRVR BCKLGHT/WHT 26QFN-EC |
| 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 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A8510 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency |
| A8510GECTR-T | 功能描述:IC LED DRVR BCKLGHT/WHT 26QFN-EC 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 |
| 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 |
发布紧急采购，3分钟左右您将得到回复。