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LAUNCHXL-F28379D: 开发板出现故障,3.3V口与GND短路,想问一下3.3V的来源是哪个芯片

Part Number: LAUNCHXL-F28379D

开发板电源接线:仿真器与开发板电源隔离,JP1、JP2、JP3断开,J16外接5V电源,JP4、JP5短接,JP6断开,即仿真器隔离、外部5V供电模式。

上电调试过程中开发板出现故障,发现3.3V口与GND短路,开发板不能正常工作。但是查阅LAUNCHPAD原理图并没有发现5V转3.3V的来源。现在想问一下仿真器隔离、外接5V模式下是哪个芯片将5V转为3.3V?