【经验】思瑞浦车规级高压精密运算放大器TPA1882Q-VR-S设计经验
TPA1882Q-VR-S是思瑞浦的一款国产车规级高压精密运算放大器,通过了AEC-Q100认证,工作温度范围为−40到125℃。工作电压范围为4.5V至36V,低失调电压50μV、带宽12MHz、转换速率10V/μs,同时每个放大器的静态电流为2mA。
该放大器具有OTP保护功能,可以保证芯片安全,当结温达到170℃左右时,放大器的输出将进入高阻抗状态,当结温降至150℃左右时,器件将恢复。该器件采用8引脚的SOIC-8和MSOP-8封装,主要应用于车载充电器、电机控制以及精密信号调理等领域。
如下为该器件应用设计注意事项,当然,这些设计注意事项对于其他运放也是可以参考的:
1、尽量避免在运放输出端直接并接电容。输出直接驱动电容,相当于增加了一个极点,会影响运行输出的稳定性,可能导致输出震荡。解决办法:建议在输出和电容之间串接一个小电阻或者调整外挂的电容。如下图所示:
2、TPA1882Q为双运放,对于不使用的单元,建议接为缓冲器模式,输出悬空,同相端接共模范围内的固定电压,这样运放状态是闭环的,工作点正常,输入输出都不会受到干扰,只消耗静态电流。如下图所示:
3、反馈回路要注意layout问题,不合理的布局布线容易引入噪声,严重时会导致电路出现振荡。反馈回路的元件应尽量靠近运放,PCB走线要尽量短,同时要尽量避开数字、高频信号等干扰源。
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电子商城
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最小起订量: 100000 提交需求>
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