lm2575-3.3制作2路输出的电源,主路+3.3v 600mA,辅路+5v 150mA,电感按3.3v 80TS ,5V 44TS绕制,制作完成后发现电压和输出功率正确,只是+5V一带载,3.3V的纹波变得很大,约80mV,不带载时只有25mV,请各位帮忙分析问题出在哪里?
电感的骨架9*12工字型磁心,线径0.31mm,电容用高频低阻.
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