48V three-phase inverter reference design with shunt resistor-based in-line motor phase current sensing

The TIDA-00913 reference design implements a 48V/10A three-phase GaN inverter with precision shunt-based in-line phase current sensing for precise control of precision drives such as servo drives. One of the biggest challenges with shunt-based in-line phase current sensing is the high common-mode voltage transients during PWM switching. The INA240 bidirectional current sense amplifier uses enhanced PWM rejection to overcome this problem. This reference design provides an output voltage from 0 to 3.3V, regulated to ±16.5A, with a mid voltage of 1.65V, enabling highly accurate phase current over temperature. TIDA-00913 provides a TI BoosterPack-compatible interface to connect to the C2000 MCU LaunchPad™ development kit for easy performance evaluation.

characteristic

• ● Wide input voltage range 12V to 60V three-phase GaN inverter with 7Arms output current per phase and non-isolated phase current sensing.
• ● Precision in-line phase current sensing, using 5mΩ shunt, full-scale range is ±16.5A, nominal range is ±10A.
• ● High-precision phase current sensing within the temperature range of -25°C to 85°C. The uncalibrated accuracy is less than ±0.5%; the calibrated accuracy is less than ±0.1%.
• ● Reduce system cost using the INA240, a non-isolated current sense amplifier with excellent AC common-mode rejection that operates at PWM switching frequencies up to 100kHz.
• ● Since the INA240 bidirectional zero-drift current sense amplifier is directly connected to the 3.3V ADC, the BOM is reduced and layout is facilitated.
• ● TI BoosterPack compatible interface with 3.3VI/O facilitates performance evaluation using the C2000 MCU LaunchPad™ development kit.