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| 型号： | A8512ELBTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 1/18页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHT/RGB BKLGT 24SOIC |
| 标准包装： | 3,000 |
| 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-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
A8512
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 switching frequency
Controlled startup using options of Enable, PWM signal, or
battery voltage ramp
Parallel operation with one boost controller (master) and up to
five slave controllers
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,
or TSSOP 24-pin and QFN 28-contact packages with exposed
thermal pad for better thermal performance
The A8512 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.
PWM dimming allows LED currents to be controlled in 500:1
ratio. 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. Multiple
A8512s can be connected in parallel, with one master controller
controlling the boost stage, and up to five slave controllers,
which act as LED sinks. This allows up to 36 LED strings to
be powered by just one boost converter.
The A8512 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
Packages:
28-contact QFN
with exposed thermal pad
(ET Package)
24-pin SOICW
with internally fused pins
(LB package)
24-pin TSSOP
with exposed thermal pad
(LP package)
Not to scale
function provides soft start and protects against overloads.
The device is provided in a 24-pin SOICW package (LB), with
internally fused pins for enhanced thermal dissipation, and a
28-contact 5 mm × 5 mm QFN package (ET) and a 24-pin
TSSOP package (LP), both with an exposed thermal pad for
enhanced thermal dissipation. All packages are lead (Pb) free,
with 100% matte tin leadframe plating.
Typical Application Circuit
V BAT
8 to 24 V
C1
C2
L1
Q1
D1
R SC
R OVP1
C3
C4
18 LEDs per string
V OUT
R OVP2
18 LEDs per string
130
LED Current versus ISET Resistor Value
V REF = 1.24 V, Gain = 640
P
P
P
P
DRIVER SENSE1 SENSE2 OVP
VIN
VBIAS
V BAT
DRIVER SENSE1 SENSE2
VIN
VBIAS
OVP
120
110
Fault
Enable
PWM
R1
C5
R FSET
R ISET
FAULT
EN
PWM
COMP
FSET
ISET
A8512
Master
LED1
LED2
LED3
LED4
C7
R FSET
R ISET
FAULT
EN
PWM
COMP
FSET
ISET
A8512
Slave A
LED1
LED2
LED3
LED4
100
90
80
70
60
Rz1
VREG7V
LED5
Rz2
VREG7V
LED5
50
Cz1
C6
LED6
AGND AGND LGND LGND PGND
Cz2
C8
LED6
AGND AGND LGND LGND PGND
40
30
20
P
Control Bus
P
To additional slaves
6
8
10
12
14
16 18 20
22
24
26
28
30
R ISET (k Ω )
Figure 1. Typical application circuit for single IC operation, and (in dotted box) master/slave multiple IC operation.
A8512L-DS, Rev. 6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8512ELPTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 24TSSOP 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 |
| A8513 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver |
| A8513KLPTR-1-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver |
| A8513KLPTR-2-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver |
| A8513KLPTR-3-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver |
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