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LM25088做负电压输出时,加上负载后电压会减小

Other Parts Discussed in Thread: LM25088

用LM25088设计了一个反向输出电源,输入6.4V-11.5V,输出-12V 2A的电源,原理图如下:

电源空载时,输出-12.05V ,一切正常;加上16欧姆的负载之后,输出在-11.5V;加上8欧姆的负载,输出电源就变为--11.2V;负载变化时,输出变化也太大了,这个是什么问题导致的呢?

望TI工程师解答,谢谢!