TIDA-01606: TIDA-01606 project issue

Hi Cherry,

if you operate the converter as an inverter, it is not mandatory to have resistors, but your task is to increase the voltage of the DC bus to be higher than Vll*sqrt(2) if you want to avoid problems of inrush current.

Sometimes you need these resistor too because you need to keep the DC link at high voltage because you have a flyback connected to this.

Thanks

Best Regards

Riccardo

Hi Cherry,

If there is acoustic noise, then the burst mode switching frequency is below the 20kHz hearing threshold.  

The Magneto MV module burst mode frequency will  be a function of the output capacitance and the load, since it will adjust to stay within the control’s hysteretic band.

If inverter is running, then the load will consist of pulses each gate drive turn-on, so the the Magneto MV module burst mode frequency will lock onto the inverter’s PWM frequency.

If the inverter is off, then the the Magneto MV module burst mode frequency will  be lower and can be adjusted by selection  of the output capacitance and the load. 

The ceramic capacitors usually are the culprits.  They are the smallest and lowest cost capacitors, but if noise is an issue then add an organic electrolytic capacitor at the intput from VIN to GNDP first and see it it helps all the Magneto MV modules. If noise not gone, then try adding the capacitor at the output of each from VDD to VEE.

I hope that this can help :)

Thanks

Best Regards

Riccardo