UCD3138HSFBEVM-029开发板A.5.3 Current Sharing Operation章节中提到“The current sharing operation is made possible in the steady-state. To share the load current in soft start time, it is recommended to use Synchronous Startup technique as described in Section 12.5.2. With this technique, the load current can still be shared to some degree since CPCC allows completing the soft start without shut down even if one converter in slight over load condition. Please contact TI to find how to set up Synchronous Startup.”请问UCD3138如何实现同步启动，硬件、软件如何设计？