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DRV8320: Allowable number of shunt resistors

Isao Takigasaki
Expert 3350 points
Part Number: DRV8320
Other Parts Discussed in Thread: CSD88599Q5DC, DRV8323, DRV832X

Hi,

My customer has a question.
In the designs with DRV8320, can three current sense resistors be used? 

My cutomer refered the description in the datahseet of CSD88599 as shown in below.  This is the background the question.

However, for cost sensitive applications, current sensors are generally replaced with current sense resistors.
• For designs using the 60-V three-phase smart gate driver DRV8320SRHBR, only one current sense resistor
RCS can be placed between common source terminals for all three power block devices CSD88599Q5DC to
PGND as depicted in Figure 22 above.
• For designs using the 60-V three-phase gate driver DRV8323RSRGZT, three current sense resistors RCS1,
RCS2, and RCS3 can be used between each CSD88599Q5DC source terminals to GND. The three-phase
driver IC should be placed as close as possible to the power block gate GL and GH terminals.

Best Regards, Taki

  • 0
    TI__Guru 65220 points
    Taki-San,

    I am not sure of the guidance in the CSD88599 datasheet. For the DRV832x devices which my group supports, the DRV8320 has no Current Sense Amplifiers so no current sense resistors can be measured. The DRV8323 has three current sense amplifiers and therefore it can measure three separate current sense resistors. An external current sense amplifier can be used with the DRV8320 but I'm not sure why the CSD88599 datasheet would limit this to only one current sense resistor since that limitation is not because of the DRV8320.

    Regards,

    -Adam