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LM317: LM317DCYR输出电流达不到预期的500mA,只能输出200mA

Part Number: LM317

目前项目用到LM317DCYR这款LDO,要实现的功能输入电压30V,输出电压20V,500mA。目前碰到的问题:输出电压20V正常,接负载稳定输出电流只有200mA,负载给500mA只能维持4秒。下面是对应的原理图