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TPS65320 负载电流只有4V,50mA,标称3A,求助分析哪里出问题了



项目应用场景:  TPS65320 包含一个DCDC(3A),LDO的开关电源芯片:   用在我一个GPRS项目上 TPS65320 DCDC输入24V降压4V(2A)供给GPRS,LDO 3.3V(250MA)供给单片机系统:现在问题是,TPS65320DCDC降压4V只能带动50MA 负载电流
已经尝试过:降低频率至500K,电感量增大,区别不大,因PCB面积受限制,所以没完全按照参考手册布局布线,希望大神指点,2A 和 50MA 差太多了