参数资料
型号: A8516ELPTR-T
厂商: Allegro Microsystems Inc
文件页数: 1/17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:
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
Features and Benefits
Description
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Six integrated high current sinks
Fixed frequency current mode control with integrated gate driver
300 kHz to 1 MHz adjustable Boost switching frequency
Controlled startup using options of Enable, PWM signal, or
battery voltage ramp
Active current sharing between LED strings for ±0.6% accuracy
and matching
No audible MLCC noise during PWM dimming
Adjustable overvoltage protection (OVP)
Open or shorted LED string protection
Overtemperature, cycle-by-cycle current limit, and
undervoltage protection
SOIC 24-pin package for easy single-side PCB manufacturing,
The A8516 is a multi-output WLED/RGB driver for
backlighting LCD monitors and televisions. It integrates a boost
controller to drive external MOSFET, and six internal current-
sinks. The boost converter operates in constant frequency
(programmable) current mode control.
The LED sink current is set by an external R_ISET resistor
(see chart below). More than one LED sinks can be combined
together to achieve even higher current per LED string.
The A8516 operates from a single supply of 8 to24 V. It provides
protection against overvoltage, open or shorted LED string,
and overtemperature. A dual level cycle-by-cycle current limit
function provides soft start and protects against overloads.
or TSSOP 24-pin package with exposed thermal pad for better
thermal performance
Packages:
24-pin SOICW
The device is provided in a 24-pin SOICW package (LB), with
internally fused pins for enhanced thermal dissipation, and a
24-pin TSSOP package (LP), with an exposed thermal pad
for enhanced thermal dissipation. All packages are lead (Pb)
free, with 100% matte tin leadframe plating.
with internally fused pins
(LB package)
Not to scale
24-pin TSSOP
with exposed thermal pad
(LP package)
Typical Application Circuit
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
130
120
LED Current versus ISET Resistor Value
V REF = 1.24 V, Gain = 640
R1
C5
FAULT
A8516
LED1
110
100
90
EN
PWM
LED2
80
70
R2
R3
R FSET
R ISET
Rz1
COMP
FSET
ISET
VREG7V
LED3
LED4
LED5
60
50
40
30
20
Cz1
C6
LED6
6
8
10
12
14
16 18 20
R ISET (k Ω )
22
24
26
28
30
AGND AGND LGND LGND PGND
R2, R3 optional (A8516 has
internal pull-down resistors)
A8516, Rev. 1
P
Figure 1. Typical application circuit; VIN pin tied to V BAT .
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