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QX5278 Datasheet(PDF) 1 Page - QX Micro Devices Co.,Ltd.

Part # QX5278
Description  Buck-boost LED driver
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Manufacturer  QXMD [QX Micro Devices Co.,Ltd.]
Direct Link  http://www.qxmd.com.cn/
Logo QXMD - QX Micro Devices Co.,Ltd.

QX5278 Datasheet(HTML) 1 Page - QX Micro Devices Co.,Ltd.

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QX5278
升降压型 LED 驱动器
1 of 9
QX5278_DS03CN
泉芯电子技术(深圳)有限公司
www.qxmd.com.cn
典型应用电路图
LX
BAT
LED+
LED-
VSS
LS
RCS
VIN
C1
RCS
L1
C2
C3
图 1：QX5278 典型应用电路图
概述
QX5278 是一款升降压型 LED 恒流驱
动芯片，特别适合于锂电池或三节干电池
供电的 LED 灯具。
当电源电压低于 LED 灯的导通电压
时，QX5278 工作于升压状态；当电源电
压高于 LED 灯的导通电压时，QX5278 工
作于降压状态。
QX5278 工作电压范围 2.4V 至 5.5V，
工作电流小于 500mA，效率高达 90%，
LED 电流大小由外接电阻设定，电流精度
在 5%以内。
QX5278 还提供 2.4V 的欠压保护和
5V 的开路保护功能。
QX5278 采用 SOP8 封装。
特点
 工作电压：2.4V~5.5V
 LED 电流：小于 500mA
 LED 电流由外接电阻设定
 效率：高达 90%
 欠压保护电压：2.4V
 开路保护电压：5V
 电流精度：±5%
应用领域
 锂电池供电的 LED 灯具
 三节干电池供电的 LED 灯具


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