SPRUHJ1I January 2013 – October 2021 TMS320F2802-Q1 , TMS320F28026-Q1 , TMS320F28026F , TMS320F28027-Q1 , TMS320F28027F , TMS320F28027F-Q1 , TMS320F28052-Q1 , TMS320F28052F , TMS320F28052F-Q1 , TMS320F28052M , TMS320F28052M-Q1 , TMS320F28054-Q1 , TMS320F28054F , TMS320F28054F-Q1 , TMS320F28054M , TMS320F28054M-Q1 , TMS320F2806-Q1 , TMS320F28062-Q1 , TMS320F28062F , TMS320F28062F-Q1 , TMS320F28068F , TMS320F28068M , TMS320F28069-Q1 , TMS320F28069F , TMS320F28069F-Q1 , TMS320F28069M , TMS320F28069M-Q1
The DRV8312-69M-KIT is the lowest-power kit of all TI kits. It uses a TI DRV8312 power module that contains six power MOSFETs and their corresponding gate drivers. The kit accepts any C2000, 100-pin DIMM cards (Control Cards). A unique feature of the DRV8312 is that it can sustain switching frequencies up to 500 kHz with very-high efficiency.
For the following discussion, refer to the schematic in the DK-LM3S-DRV8312 Baseboard Hardware Reference Guide. OA3, OA4, and OA2 are op-amps that make up the Kelvin current connections for phases A, B, and C, respectively. The differential gain of this circuit is 19.08 V/V. R52, R53, and R50 are shunt resistors for each phase and are 10 mΩ each. The amount of current that causes a 3.3 V output to the ADC is 3.3/.010/19.08 = 17.30 A/V. This current gain is used in the user.h file of InstaSPIN for the parameter USER_ADC_FULL_SCALE_CURRENT_A.
To select between the 2 current shunt method or the 3 current shunt method, set the user.h parameter USER_NUM_CURRENT_SENSORS to either 2 or 3 depending on the number of current shunts that are used.