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LM3489 MOS的G级电压不正常 效率低

BEITONG TIAN
Prodigy 100 points
Other Parts Discussed in Thread: LM3489

各位专家好，我最近自制了一个电源，使用的芯片是LM3489，输入电压20v 输出8v 带负载20欧姆，效率只有60几。测了G级的电压发现不正常。