I've started to build a brushless driver by using some Power MOSFETs and some MOSFET drivers, in order to drive the Power MOSFETs.
I have connected the chips as shown in the application circuit (page 3) in the datasheet of the L6743D MOSFET driver, in order to drive my couple of N-MOSFET, but I noticed that nothing worked as it should.
After that, I decided to check if the MOSFET Driver (L6743D) is working as it should. Therefore I have powered up the L6743D with 12 V Vcc, set High the EN pin (5 V of the micro) and set the PWM input from my micro (Arduino).
At this point I noticed that the UGATE pin keeps staying HIGH (constant at Vcc = 12 V), while the LGATE is following the PWM signal's shape.
According to the datasheet listed above (page 8), the UGATE pin should be the opposite of the LGATE pin. Hence I should have something similar to my PWM signal given as input and both the signals should turn on/off the Power MOSFETs.
This is not happening and I really don't understand what I'm doing wrong.
Could you help me, please? Am I missing something about the usage of the L6743D MOSFET Driver?
Thank you in advance for your help!
Here you are my circuit, consider the couple of N-MOSFETs into the same package.
When I turn on the power supplier and limit the current to 200mA, the power supplier shows me that there is a CC. I have also tried to set the limit higher without any success.
Hope this is helpful to understand my issue.