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请教:LM5576 输出电压不可调节等问题!

Other Parts Discussed in Thread: LM5576

 

初次使用LM5576,电路图如上,输入电压采用12VDC,希望得到输出为7V/3A,

输出电压一直都为6.4V,而且改变R4和R5阻值,输出电压仍然为6.4V。

测试负载能力很弱,100mA.

请专家给予指导

谢谢