DRV8303_15 Datasheet, PDF (25/37 Pages) Texas Instruments – Three Phase Gate Driver

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DRV8303
SLOS846B – SEPTEMBER 2013 – REVISED NOVEMBER 2015
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 DRV8303 (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 8. Motor Spinning 2000 RPM
Figure 9. Motor Spinning 4000 RPM
Figure 10. Gate Drive 20% Duty Cycle
Figure 11. Gate Drive 80% Duty Cycle
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