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DRV8301 3 phase pre driver with Integrated Buck Regulator

Other Parts Discussed in Thread: DRV8301, TPS54160

The DVR8301 has a integrated buck regulator  but there is no design information in the data sheet for a switcher of this type.  There needs to be  equations/ graphs for selecting the timing frequency resistor, input/ output caps, Inductor ,  etc  as would be found on a dedicated switcher data sheet.  It appears to be the same type as a TPS54160 family.    What document is to be used to design the regulator component selection on the  DRV8301 ?   I dont want to use the parts and components that are described in the schematic  in the EVAL kit  for the DRV8301.  Thanks

  • Please use the TPS54160 document as a reference.  It is exactly what you need for the DRV8301.

     

  • Ok Great.

     The DRV8301 data sheet block diagram indicates the buck regulator power input (PVDD2) is completely independent from the motor driver power in (PVDD1). So I can run the buck regulator on PVDD2  with the rest of the driver unpowered (PVDD1) ?   correct?     Is there any issue if the buck regulator is somehow shut off but the  PVDD1 driver power is still on?  

    Is there a way to estimate/calculate the expected temperature rise in the 8301 package just from the buck power supply component alone? (assuming I know the Vout load)

    Thanks

  • The PVDD1 and PVDD2 terminals are NOT connected in anyway.  It is OK to operate them completely independant of each other.

    To calculate power dissipation, I recommeded looking at page 39 in the document below.  This datasheet models the buck inside the DRV8301 and can be used to calculate expected temp rise.

    http://www.ti.com/lit/ds/symlink/tps54160.pdf

     

  • The DRV8301 has a large heatsink area on the package . So my question is how is the Pd calculation from the TPS54160 MSOP10 going to translate to the 56 HTSSOP heat rise?  How is the TPS54160 die situated/ related to the DRV8301 heatsink ?  Conversely, how much heat from the DRV8301 will flow into the TPS54160 area?  are they thermally isolated?

    Thanks

  • On the DRV8301, if I force the  EN_GATE  from high to low to shut down the outputs,  does that mean the  DRV8301 gate drives (GH_X & GL_X)  are immediately driven low by the DRV8301 to force 'off' the external FETS ?  or are DRV8301 output drives to the gates just put in a high impedance state (regardless of the present drive state)?  

    Basically I want to force all the external FETS off immediately, independent of the PWM uP commutation commands.  Is the EN_GATE pin the place to do that?   

  • EN_GATE is the pin you want.  It forces the outputs LOW, so the external FETs will go to a HIZ state. 

    Sorry, this should be more clear in the datasheet.  It can be used asynchronously to PWM commands from the MCU.