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请教TPS61175芯片升压不稳定的问题

Other Parts Discussed in Thread: TPS61175, TPS40210, TPS55340, TPA3110D2

输入6.6~8.4V

输出电压18.3V/2A

存在问题:输出负载300mA时,电压基本稳定;输出负载800mA时,电压开始波动(1mV/S的速度增涨),回路电流一直缓慢上升;输出负载1200mA时,电压开始波动(1mV/S的速度增涨),回路电流迅速上升;

疑问:是不是TPS61175芯片在此电路中不适合,还是哪个器件搭配不当?

请专家赐教,电路图如附件: