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UC3843做BOOST电路,12V升24V,带负载只能跑1.3A电流,功率做不大

Other Parts Discussed in Thread: UC3843, TPS43061

我用UC3843做BOOST升压电路,12V升24V,频率110KHZ,MOS管源极电流采样电阻用50m欧康铜丝,带负载电流只能跑1.3A,再大了电压就往下降,请问是哪里限制了电路的功率