1 Introduction

High performance, three-phase inverters operated at 24V to 60V are gaining more traction in emerging industrial applications such as high-efficiency servo drives, and collaborative, surgery, and humanoid robots. Accurate and reliable phase current sensing is crucial in these applications to achieve smooth torque and precise position control. These applications are highly space constrained and the 3-phase inverters are often integrated into the motor. Therefore, a small design size with low profile and the ability to operate at high ambient temperatures up to 125°C are important. In-phase, shunt-based current sensing as shown in Figure 1-1 provides the highest resolution measurement of the motor current and is an industry standard design for high-performance motor drives. TI's newly released AMC0106Mxx functionally isolated modulators in a small, lead-less package enable such measurement in a much smaller design size than what has been achievable so far.

Figure 1-1 48V, 3-Phase Inverter With Shunt-Based, In-Phase Current Sensing