HI,
I want to measure the voltage of the resistance in the RLC circuit. And I connected the 10uH inductance and 5.6Ω resistance to the P3.
Then two 5V power supply of DH1718D-4 is provided. PWM1 and PWM2 send the 100kHZ signal and the duty cycle is 50%.
Maybe I make some mistakes. The voltage of the resistance is wrong.
I use the multimeter to measure the pins.
The pin PWM1 , BOOT, BOOT-Rand the PGND is short circuited . The pwm2 and the VIN is short circuited.
Then I change the DSP and the CSD97396. I have a good result .
But then I find the pwm1 and PGND is short circuited again. And the U3 is fine.
why did these problem happen ? And the maximal current of power supply is 3.5A. Can the power supply result in the problems?
Regards,
TIANQING LI