DRV8962EVM: 0.5 Volt Amplitude - 2.5 to 5 MHz noise in Current Reading Signals and PWM Signals

Hi,

I am using DRV8962EVM in an application for Brushless DC linear motor control.

A see a huge noise with 0.5 volt amplitude at 2.5-5 Mhz, only when turning on the power supply to the DRV8962EVM board.

The noise appears to be in the (shunts) current reading outputs of the board (J17, J18, J20), and also at the PWM signals injected into the board from a STM32f405 discovery board. The PWM signals are clean (no noise) when the DRV8962EVM board power is disconnected.

I appreciate your help on resolving this noise issue.

We do need a cleaner current reading feedback from the board to implement some current-signal-based algorithm.

Thank you,

Amin Kamalzadeh