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[问答] MCP73843充电问题
76 电池 电容器
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嗨,我用100mR电阻和0.1uF电容在DS21823D、MCP73843数据表的第1页上建立了示例电路。我可以从3.6V-4.2V充电3000毫安电池,不会发生错误。然而,如果我从1.2V-4.2V给这个电池充电,充电电路超时并显示出闪烁故障。我试着将电阻降低到50mR以便更快地给电池充电,但是充电单元立即显示出闪烁故障。在数据表中,建议只使用0.1uF电容器?除了改变充电电阻,我看不出还有什么需要充电更大容量的电池。请你指出我要从1页上显示的示例电路中更换一个3000毫安的电池。谢谢。
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2019-10-21 14:06:04   评论 分享淘帖 邀请回答

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你看过数据表的第4.1部分,收费资格和预处理吗?跟随阅读部分5.1.5定时器设置输入(定时器)和5.2.1充电状态输出(STAT1)。我想这些章节解释你的问题是试图对耗尽的电池进行充电。
2019-10-21 14:18:50 评论

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你解决了你的问题吗?我从数据表中得到的结论是,你需要一个大的定时帽,以便在这种情况下,在有限的充电电流下,为一个高度耗尽的电池充电时,能够持续很长很长的时间。
2019-10-21 14:24:58 评论

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" 3.6V-4.2V充电3000毫安电池,不会发生错误。"," 1.2V-4.2V给这个电池充电,充电电路超时并显示出闪烁故障。”
1.2V-4.2V,电池是什么类型的?
注意一下Lithium-Ion/Lithium-Polymer Battery 的截至电压,MCP73843会怎么认为呢。
2019-10-22 16:00:37 评论

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MCP73843 Typical Application Circuit
MCP73843 Typical Application Circuit.jpg
MCP73841-2 Operational Flow Algorithm.jpg
MCP73843 Functional Block Diagram.jpg
2019-10-22 16:25:24 评论

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4.1 Charge Qualification and Preconditioning

Upon insertion of a battery or application of an external supply, the MCP7384X family of devices automatically perform a series of safety checks to qualify the charge.
The input source voltage must be above the undervoltage lockout threshold, the enable pin must be above the logic-high level and the cell temperature monitor must be within the upper and lower thresholds.
The cell temperature monitor applies to both the MCP73841 and MCP73842, with the qualification parameters being continuously monitored. Deviation beyond the limits automatically suspends or terminates the charge cycle.
Once the qualification parameters have been met, the MCP7384X initiates a charge cycle. The charge status output is pulled low throughout the charge cycle (see Table 5-1 for charge status outputs). If the battery voltage is below the preconditioning threshold (VPTH), the MCP7384X preconditions the battery with a tricklecharge.
The preconditioning current is set to approximately 10% of the fast charge regulation current. The preconditioning trickle-charge safely replenishes deeply depleted cells and minimizes heat dissipation in the external pass transistor during the initial charge cycle. If the battery voltage has not exceeded the preconditioning threshold before the preconditioning timer has expired, a fault is indicated and the charge cycle is terminated.
2019-10-22 16:33:22 评论

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If the battery voltage has not exceeded the preconditioning threshold before the preconditioning timer has expired, a fault is indicated and the charge cycle is terminated.
如果在预充计时器到期之前电池电压未超过预充阈值,则表明存在故障,并且充电周期终止。
2019-10-22 16:37:45 评论

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