Other Parts Discussed in Thread: OPA549
OPA541做大电流输出时,负载为2欧(运放输出端和地端之间),电路结构简单,同相放大,供电±15V,AC输入1KHZ,100mv峰峰值,G=4.调节增益,该失真并未消失。
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您叙述说AC输入1KHZ,100mvpp,且G=4,但是您的波形输出是280mvpp或276mvpp,与您设置的增益对应不上?
驱动的负载2Ω是纯阻性的吗?
OPA541可以输出Peak current 到10A,我认为输出幅值280mV加在2欧姆的负载上,相对来说不是强载
找到的一个与OPA541相似的帖子:
https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/873273/opa549-negative-part-of-the-output-is-distorted?tisearch=e2e-sitesearch&keymatch=OPA541%2525252520The%2525252520output%2525252520waveform%2525252520is%2525252520distorted#
下面文档给出了在电流限制期间提高稳定性 的方法,加上后看是否有所改善:
IMPROVE OPA541 CURRENT-LIMIT STABILITY:www.ti.com.cn/.../sboa057