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LM3444MAX调试异常

Other Parts Discussed in Thread: LM3444

我用LM3444芯片想做一个恒流源。输入220V-AC,输出要求V(LED)=36V,电流控制在约1A,按照芯片数据手册Figure19,我所对应的BOM如下:
C4:100nf;
R3:0.72Ω
R4:510K;
C11:200pF;
L2:280uH;
R1:4.7Ω;
VBUCK我已经确认没有问题,
调试过程中遇到GATE输出为180us-off,立刻on,随即又180us-off,一直处于这个循环状态。
我能肯定负载没有短路。
请问怎么解决?