参数资料
型号: A8504EECTR-T
厂商: Allegro Microsystems Inc
文件页数: 18/19页
文件大小: 0K
描述: IC LED DRVR WHT/RGB BCKLGT 26QFN
标准包装: 1
拓扑: PWM,升压(升压)
输出数: 8
内部驱动器:
类型 - 主要: 背光
类型 - 次要: RGB,白色 LED
频率: 200kHz ~ 2MHz
电源电压: 4.2 V ~ 5.5 V
输出电压: 47V
安装类型: 表面贴装
封装/外壳: 26-WFQFN 裸露焊盘
供应商设备封装: 26-QFN/MLP-EP(4x4)
包装: 标准包装
工作温度: -40°C ~ 85°C
产品目录页面: 1141 (CN2011-ZH PDF)
其它名称: 620-1215-6
A8504
WLED/RGB Backlight Driver for Medium Size LCDs
Pin-out Diagram
PGND
SKIP
COMP
1
2
3
21 PGND
20 PWM
19 GND
FSET
ISET
GND
LED1
4
5
6
7
EP
18 SEL3
17 SEL2
16 SEL1
15 LED2
(Top View)
Terminal List Table
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Name
PGND
SKIP
COMP
FSET
ISET
GND
LED1
LED3
LED5
LED7
LGND
LED8
LED6
LED4
LED2
SEL1
SEL2
SEL3
GND
PWM
PGND
OVP
SW
SW
VIN
AGND
EP
Description
Power ground pin.
Reduces boost switching frequency in case of light load to improve frequency. Normally, this pin should be low; when
high, f SW is divided by 4.
Compensation pin; connect external compensation network for boost converter.
Sets boost switching frequency. Connect RFSET from FSET to GND to set frequency. Range for RFSET is 13 to 40 k Ω .
Sets 100% current through LED string. Connect RISET from ISET to GND. Range for RISET is 8.45 to 30 k Ω .
Connect to AGND.
LED x capable of 45 mA.
Power ground pin for LED current sink.
LED x capable of 45 mA.
SEL1, SEL2, and SEL3 decide active LED strings.
Connect to AGND.
On/off and on/off LED current control with external PWM. Apply logic level PWM for PWM controlled dimming mode.
When unused, connect to AGND.
Power ground pin.
Connect to this pin to output capacitor +Ve node through a resistor to enable OVP (overvoltage protection). Default OVP
level with 0 Ω resistor is 30 V, and it can be programmed up to 47 V.
DMOS drain node.
Input supply for the IC. Decouple with a 0.1 μ F ceramic capacitor.
Circuit ground pin.
Exposed pad. Electrically connected to PGND and LGND; connect to PCB copper plane for heat transfer.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1 . 508.853.5000; www.allegromicro.com
17
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