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mc33907 power_on not voltage output

Question asked by lanhua hua on Jun 5, 2016
Latest reply on Jun 17, 2016 by lanhua hua

     I am using mc33907 with mpc5643l to achieve ASIL D safety level .

     mc33907 Pre_regulator connection in buck configuration ,circruit diagram is shown in figure.Now, the following problems:

 

After POWER_ON can be detection VSUP1/VSUP2/VSUP3 is 12V,but CAN_5V,VAUX,VCCA,VCORE,VRPE output voltage value is 0. What is the reason?

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