DRV8302_16 Datasheet, PDF (23/32 Pages) Texas Instruments – Three Phase Gate Driver

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DRV8302
SLES267C – AUGUST 2011 – REVISED MARCH 2016
parameters and your specific application. I_(MAX) in this example is 14 A.
2. Determine the available voltage range for the current shunt amplifier. This will be ± half of the amplifier
reference voltage (V_REF). In this case the available range is ±1.65 V.
3. Determine the sense resistor value and amplifier gain settings. There are common tradeoffs for both the
sense resistor value and amplifier gain. The larger the sense resistor value, the better the resolution of the
half-bridge current. This comes at the cost of additional power dissipated from the sense resistor. A larger
gain value will allow you to decrease the sense resistor, but at the cost of increased noise in the output
signal. This example uses a 0.01-Ω sense resistor and the minimum gain setting of the DRV8302 (10 V/V).
These values allow the current shunt amplifiers to measure ±16.5 A (some additional margin on the 14-A
requirement).
8.2.3 Application Curves
Figure 7. Motor Spinning 2000 RPM
Figure 8. Motor Spinning 4000 RPM
Figure 9. Gate Drive 20% Duty Cycle
Figure 10. Gate Drive 80% Duty Cycle
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