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UC3846频率问题

Other Parts Discussed in Thread: UC3846

根据资料,UC3846的频率应该由8脚和9脚的电容电阻决定。但调试时8脚和9脚的电阻电容不变,PWM频率有时20多K,有时50多K。还有哪里会影响到频率呢?