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TPS5430如何产生-12V负电压

Other Parts Discussed in Thread: TPS5430

       最近在看TPS5430产生负电压的电路图,我发现datasheet给的都是-5V的原理图,本来我打算改为-12V输出的,但是我发现一个问题,FB反馈回来的电压,与REF电压一起控制PWM的占空比,那么,不久是固定了输出只能为-5V吗?这样就不能改变输出为-12V了吗?因为要将反馈回来的电压设置为REF,才能达到相对稳定,不是吗?