Original question:
I bought your BOOSTXL-DRV8323RH. I supply DC voltage 30[V] and gate input 0-5[V](INHA, INLA) but it does not work.
Is there any missing input?
Hi Satoki-san,
Yes, your pinout is correct for GND. The only two accessible ground pins are below circled in WHITE, as well as the supply GND termnial next to PVDD.
Thanks,
Aaron
Hi Satoki-san,
Please follow the BOOSTXL-DRV8323Rx User's Guide (https://www.ti.com/lit/pdf/slvub01) and datasheet (https://www.ti.com/lit/gpn/DRV8323R)
The DRV832x is a 3-phase independent half bridge gate driver. It steps up INHx and INLx inputs (PWM inputs from MCU) into gate drive signals (GHx and GLx) around ~10-12V that can be used to switch external NMOS power MOSFETs.
The high side gate drive outputs (GHx) use a charge pump to generate the gate voltage above your motor voltage (SHx) to apply VGS = 10V and turn on the high side MOSFET gate. The low side gate drive outputs (GLx) use a linear VGLS regulator to generate the gate voltage above your low side source voltage (SPx) to apply VGS = 10V and turn on the low side MOSFET gate.
The PWM mode in DRV8323RH can be configured through the MODE pin, which are resistors configurable on the EVM on R12 and R23.
The mode settings can be found in the datasheet in section 8.3.1.1.
Thanks,
Aaron
Hi Satoki-san,
Full bridge inverter is 2 independent half-bridges. You can use any of the PWM modes to control the full bridge inverter.
6x PWM mode inserts MCU and/or driver dead time and does not allow both gates to be on at the same time.
3x PWM mode only requires 3 PWMs when INLx is high and switches the half bridges synchronously with dead time.
Independent Mode bypasses dead time and switches each FET independently, this is generally used for HS or LS drivers.
The MODE pin sets the PWM mode as shown above. It does not require DVDD - datasheet recommends it but it can be set with resistor to any 3.3V or 5V pullup source. We use a 3.3V buck on the board for the pullup as shown in R12.
Thanks,
Aaron
