Other Parts Discussed in Thread: LM5143
Dear:
LM5143输出14.5V,在输入15V左右时,会听到音频噪声。用示波器看开关波形,发现有两中状态。交替的频率大概在1kHz多。改补偿参数也避免不了这样情况。请问,有什么方法可以避免音频噪声?
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Hi
如果输入电压大于15V, 甚至20V, 30V还会等到音频噪声吗?
Hi
从你描述看是输入电压太低导致的,不能通过提高电压来改善吗?作为降压芯片,输入电压是需要大于输出的。
Hi
借助webench获得参考设计电路,见: https://webench.ti.com/power-designer/switching-regulator?powerSupply=0
输入芯片名称进入。