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| 型号： | A8512ELPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/18页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHT/RGB BKLGT 24TSSOP |
| 标准包装： | 8,000 |
| 拓扑： | 高端，低端，PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 300kHz ~ 1MHz |
| 电源电压： | 8 V ~ 24 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
A8512
LED Backlight Driver for LCD Monitors and Televisions
Application Information
PCB Layout Guidelines As with any switching power supply,
care should be taken in laying out the board. A switching power
supply has sources of high dv/dt and high di/dt which can cause
malfunction. All general norms should be followed for board
layout. Refer to figure 14 for a typical application schematic. The
A8512 evaluation board provides a useful model for designing
application circuit layouts.
The following guidelines should be observed:
? Place bypass capacitors physically close to their respective pins
(VIN, VBIAS, and VREG7V).
? Route analog ground, digital signal ground, LED ground
(LGND pin), and power ground (PGND pin) separately. Con-
nect all these grounds at the common ground plane under the
A8512, serving as a star ground.
? Place the input capacitors (C1, C2), inductor (L1), boost diode
(D1), MOSFET (Q1), and output capacitors (C3, C4) so that
they form the smallest loop practical. Avoid long traces for
these paths.
? Place the resistors R FSET and R ISET , and the compensation com-
ponents (Rz and Cz) close to the FSET, ISET, and COMP pins,
respectively. Connect the other ends to the common star ground.
? A8512 has 50 k Ω internal pull-down resistors on the EN and
PWM pins to keep these pins low while driving through tri-state
state (for example, shutdown). Add external resistors R2 and
R3 between the EN and PWM pins and ground, for added noise
immunity. Connect these resistors close to the pins and return to
the common star ground.
? Sense voltage across R SC with smaller length traces. Place the
SENSE1 and SENSE2 traces as close to each other as pos-
sible to minimize noise pickup. Connect the SENSE2 trace to
the negative end of the resistor and do not connect it to power
ground plane.
? Provide a substantial copper plane near MOSFET Q1 and the
IC, to provide good thermal conduction. When using multi-layer
PCB, make sure there are sufficient numbers of thermal vias
underneath and around the IC's exposed pads.
V OUT
18 LEDs per string
V BAT
8 to 24 V
C1
C2
L1
Q1
D1
R SC
R OVP
C3
C4
P
P
DRIVER SENSE1 SENSE2 OVP
VIN
VBIAS
P
R1
C5
FAULT
A8512
LED1
EN
PWM
LED2
R2
R3
R FSET
R ISET
COMP
FSET
ISET
LED3
LED4
Rz1
Cz1
C6
VREG7V
LED5
LED6
AGND AGND LGND LGND PGND
P
R2, R3 optional (A8512 has
internal pull-down resistors)
Figure 14. Typical application circuit with single controller; VIN pin tied to V BAT .
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
14
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| A8513KLPTR-T | 功能描述:IC LED DRVR AUTO BCKLGHT 16TSSOP 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 |
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