Isolationsverstärker

AMC0302D

AMC0302D - ±50mV Reinforced Isolated Amplifier | Texas Instruments

The AMC0302D from Texas Instruments is a precision, ±50mV-input reinforced isolated amplifier with a differential output, designed for accurate current sensing in motor drives, inverters, solar converters, and other power electronics where galvanic isolation is mandatory. It is available in both narrow-body (D) and wide-body (DWV) SOIC-8 packages. An isolated amplifier is a type of amplifier that provides electrical isolation between its input and output stages, allowing signal measurement across a potential difference while protecting low-voltage control circuitry from high-voltage transients. Isolation amplifiers form a key part of the signal chain in power conversion systems, bridging high-voltage power stages and low-voltage microcontrollers or ADCs. The AMC0302D belongs to the isolation amplifier family used for current sensing, voltage sensing, and isolated data acquisition. Key features include a linear input voltage range of ±50mV, a fixed gain of 8.2 V/V, and a bandwidth of 250 kHz. DC accuracy is excellent, with maximum offset error of ±0.3mV and gain error of ±0.2%. Low offset drift of ±5 µV/°C keeps performance stable across the full -40°C to +125°C operating range. The differential output is insensitive to ground shifts, enabling reliable signal routing over long distances on crowded PCBs. The AMC0302D uses a sigma-delta modulation architecture with an internal reference. The isolation barrier is implemented with capacitive coupling, offering high immunity to magnetic interference and supporting reinforced isolation certification of up to 5kVRMS (DWV package) or basic isolation up to 3kVRMS (D package) for 60 seconds, per TI datasheet (SBVS-series, 43 pages). Typical applications include motor phase current sensing in variable frequency drives, inverter current monitoring in solar and UPS systems, isolated current sensing in industrial automation, and battery management in electric vehicles. High accuracy and reinforced isolation make the AMC0302D suitable for safety-critical designs. When designing with the AMC0302D, maintain isolation creepage and clearance in the PCB layout, keep high- and low-side grounds separate, and filter the input for low-noise operation.