Isolated Amplifiers for High-Accuracy Current Sensing

Texas Instruments (TI) today introduced a reinforced isolated amplifier claiming the highest reliability, lowest power consumption, highest dc accuracy and improved overall efficiency compared to competitive devices. The AMC1301 is the newest addition to TI's reinforced isolation portfolio, which features the industry's highest working voltage specifications. With the lowest offset drift of 3uV/C over the widest temperature range, -40 to 125 degrees C, the AMC1301 delivers the most accurate solution for shunt-based current sensing in high-voltage equipment, such as industrial motor drives, solar inverters, battery management systems and uninterruptible power supplies.

Key features and benefits include: Highest reliability and longer lifespan: The AMC1301 is the industry’s first isolated amplifier with a working breakdown voltage of 1,000Vrms for a minimum insulation barrier lifetime of 64 years, which exceeds VDE0884-10 requirements. Like all of the isolated devices in TI’s portfolio, the AMC1301 has no relevant lifetime degradation, unlike optical components.

Lowest power consumption: At 55 percent less high-side supply current and 45 percent less low-side supply current than competitive devices, the isolated amplifier improves power efficiency, simplifies power supply design and reduces thermal drift issues for a more efficient system design and improved performance.

Highest dc accuracy: With the lowest offset error maximum of 200 uV, the lowest offset drift and the best linearity of 0.03 percent, the AMC1301 enables engineers to design the most accurate system using an isolated amplifier over the widest temperature range, without having to compensate for dc and temperature drift errors.

The AMC1301 is available today in a 5.85-mm-by-7.5-mm small outline integrated circuit (SOIC) package for US$2.90 in 1,000-unit quantities.