Dear all：
I used an oscilloscope to test CP1 and CP2 pins of DRV8824, and found that there was overshoot of about 1V, and the normal amplitude was 11.6v, and the test waveform was as follows：
Consult next what method whether eliminate to cross impulse value?
Thank you！
Timsen,
The charge pump circuit is like the following picture. When both switches are off (dead time of low side FET on to high side FET on transition), the current goes from CFLY (the cap between CP1 and CP2) to the switch node due to parasitic inductance, CP2 voltage is higher than VM about high side FET's body diode voltage. That is normal. CP1 is reference to SP2. So, it should have same jump.
To reduce this jump take too long, please make sure CFLY and CVCP are close to IC.
Timsen,
1. The previous post charge pump circuit shows all components and connections. CP2 voltage is one body diode voltage higher than VM because the parasitic current flows into CP2 and goes through high FET to VM. I don't find any other way to reduce it unless reducing the parasitic inductance in the charge pump current loop.
2. Would you show me a waveform with the current and nFault signal? I would like to see the peak current is higher than 5A and the time is longer than 3us.
