如图我用单片机和此芯片连接作了个充电器。,CT和RESTRT之间的电容,是100nf,根据数据手册的公式其充电时间是最多3小时,但是我接上电池1小时后,LED就开始闪烁了。手册给出了四种情况,我的就属于第四种:LED开始频闪,电压小于2.5V(就是没达到4.5V的电池充满电压),到达了100nf电容的预设时间45分钟(我试验时候计时了,还真是45分钟,1分不差)
45No battery or no charger input. High impedance (LED off) ---The cell voltage is less than 2.5V and charge current is regulated to 10% of the selected fastcharge current (prequalification state).
Low impedance (LED on)----Cell voltage is greater than 2.5V (fast-charge state).
Low impedance (LED on)----Charge cycle complete—charge current is less then 20% of the selected fast charge current or safety timer expires (3 hours for CCT = 100nF).
High impedance (LED off)-----Charge cycle fault—the cell voltage is less than 2.5V and the prequalification timer (45min for CCT
= 100nF) has expired. Blinking, LED on 50% dutyfactor, 1.5Hz
焊接肯定没问题,但是我的对技术手册的理解感觉很生涩,图和附件附下,望前辈们百忙中帮我分析一下问题的症结,感激不尽!
[ 本帖最后由 zxpla 于 2010-5-9 07:11 编辑 ]
有的时候是有误差
我做过充电电源,但不是用MAX1898
不过我知道你怎么样找错误,09年的国赛题目是这个,有的人用的是MAX1898,你可以参考下!!!
谢前辈!09年国赛,网上全是题目,要怎么搜能找到那个实例呢?