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| 型号： | A8516ELPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/17页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR BACKLIGHT MON 24TSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 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）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 ~ 85°C |
A8516
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 1 for a typical application schematic. The
A8516 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
A8516, 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.
? A8516 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.
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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