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LM5021MM-2无PWM波形输出,求教各位大神帮忙分析,谢谢。

Other Parts Discussed in Thread: LM5021

小弟第一次做开关电源,使用的LM5021MM-2做反激电路,但OUT脚一直没有波形。相关参数如下:

变压器的参数如下:
1、频率:100KHZ,功率:40W
2、输入:36~60V DC
3、输出:2个 +23V/200mA 独立输出、1个 ±15V/1A 独立输出、1个 +15V/100mA 独立输出(辅助绕组给芯片LM5021自供电)
4、类型:反激电路
附:已经将R2和R3更换成10K电阻,且VIN脚电压大于20V,VCC脚电压为8.5V。
power.PDF