TI中文支持网我刚设计了TPS65400电源电路，想用默认配置，上电后不启动，4路均没有输出，为什么？
user5251894：
Initial Configuration
The recommended method of configuring the TPS65400 the first time is through an external programmer through
a separate I2C programming header (as shown in Figure 19). The programming header needs to connect to the
SCL, SDA, CE, VDDD, and DGND lines, and can be done using a USB-to-I2C tool. This enables the user to
tailor the settings of the TPS65400 for each PCB specifically after PCB assembly, before the first power-up of the
board.
An alternative method is to use the firmware in an on-board microcontroller to do the initial configuration. To do
this, the user has two options:
• Power the microcontroller and the TPS65400 (VDDD, CE, and DGND connections needed) from an external
source not controlled by the TPS65400.
• Design the PCB so that the default settings of the TPS65400 allow the microcontroller to be powered when
power is applied to the TPS65400 the first time. The designer also needs to ensure that the default power-up
sequence, ramp-rates, and other default parameters do not damage any components when power is applied
the first time. After configuration, the microcontroller should pull CE low, and then all future power-ups result
in the newly configured power-up scheme to occur.初始配置必须采用I2C配置才能启动吗？
Johnsin Tao：
回复 user5251894:
Hi
TPS65400 极具灵活性，可通过 I 2C 总线提供全方位的监视和控制，同时还能够为不使用 I 2C 的系统提供电压以及 基于外部元件实现的可编程性。
