内嵌EEPROM的升压LED驱动器控制芯片设计  

Design of Step-up LED Driver Chip Embedded with EEPROM

作　　者：陈晓飞[1] 邹雪城[1] 曾子玉[1] 金海[2] 

机构地区：[1]华中科技大学电子科学与技术系,湖北武汉430074 [2]华中科技大学计算机科学与技术学院,湖北武汉430074

出　　处：《半导体光电》2008年第2期300-303,共4页Semiconductor Optoelectronics

摘　　要：设计了一款集成了输入串行数字接口、内嵌EEPROM单元的同步整流升压式DC-DC转换芯片,用于手机背光灯的白光发光二极管(LED)驱动控制。通过内嵌的8位EEPROM存储阵列电路对芯片进行配置可得到3个不同型号的芯片系列,分别驱动3、4、5个串联白光二极管,并依次对应三种过压保护阈值(14.5、18.5和23.5 V)。该芯片可采用1、1.2、1.4和1.6 MHz高频开关频率,具体频率可通过EEPROM进行配置,给芯片外围电路的设计带来了极大的灵活性。同时,可利用EEPROM单元对芯片中的参考电压基准电路进行校准,提升芯片性能。A synchronous rectification step-up DC-DC converter integrated with serial input digital interface and embedded with EEPROM was designed, which can be used as the white LED driver in the backlight of a mobile phone. By setting the ship with the embedded 8-digit EEPROM memory array circuit, three different types of chip series can be acquired. They are able to drive 3,4, 5 serial white LEDs and in turn correspond to three different over voltage protection threshold （14. SV,18. SV,23. SV）. 1MHz,1.2MHz,1.4MHz,1.6MHzhighswitchfrequency is available in this chip. The feature of setting concrete frequency by EEPROM brings much flexibility in design. The EEPROM element also improves the performance of the chip by calibrating the voltage reference circuit.

关 键 词：白光LED驱动 数字接口 EEPROM单元 

分 类 号：TN141[电子电信—物理电子学]