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TPS65131 负输出带载能力特别低

Other Parts Discussed in Thread: TPS65131

最近设计的一个电路,用到了TPS65131锂电池升压至双12V的方案,但是做好电路之后,空载的时候电压正确,带低负载的时候就会压降的厉害,输出电流只有几个mA,而我希望能获得每路200-500mA的电流。

如果用tps65131不能获得这么大的输出,请教可以换用哪款芯片获得±12V的电源,如果是电路设计错误求指出错误!

原理图

PCB

感谢