ACPL-782T-500E

The ACPL-782T isolation amplifier was designed for voltage and current sensing in electronic motor drives and battery system monitoring. In a typical implementation, and motor currents flow through an external resistor and the resulting analog voltage drop is sensed by the ACPL-782T. A differential output voltage is created on the other side of the ACPL-782T optical isolation barrier. This differential output voltage is proportional to the motor current and can be converted to a single-ended signal by using an op-amp as shown in the recommended application circuit. Since common-mode voltage swings of several hundred volts in tens of nanoseconds are common in modern switching inverter motor drives, the ACPL-782T was designed to ignore very high commonmode transient slew rates (of at least 10 kV/μs). The high CMR capability of the ACPL-782T isolation amplifier provides the precision and stability needed to accurately monitor motor current and DC rail voltage in high noise motor control environments, providing for smoother control (less “torque ripple”) in various types of motor control applications. The product can also be used for general analog signal isolation applications requiring high accuracy, stability, and linearity under similarly severe noise conditions. The ACPL-782T utilizes sigma delta (Σ - Δ) analog-to-digital converter technology, chopper stabilized amplifiers, and a fully differential circuit topology. Together, these features deliver unequaled isolationmode noise rejection, as well as excellent offset and gain accuracy and stability over time and temperature. This performance is delivered in a compact, auto-insertable, industry standard 8-pin DIP package that meets worldwide regulatory safety standards. (A gull-wing surface mount option -300E is also available). Avago R² Coupler isolation products provide the reinforced insulation and reliability needed for critical in automotive and high temperature industrial applications.

Applications

• Automotive Motor Inverter Current/Voltage Sensing
• Automotive AC/DC and DC/DC converter Current/ Voltage sensing
• Automotive Battery ECU
• Automotive Motor Phase Current Sensing
• Isolation Interface for Temperature Sensing
• General Purpose Current Sensing and Monitoring

Key features

• ±2% Gain Tolerance @25°C
• 15 kV/μs Common-Mode Rejection at VCM = 1000V
• 30ppm/°C Gain Drift vs. Temperature
• 0.3 mV Input Offset Voltage
• 100 kHz Bandwidth
• 0.004% Nonlinearity
• Compact, Auto-Insertable Standard 8-pin DIP Package
• Worldwide Safety Approval: – UL 1577 (3750 VRMS/1 min.) and CSA IEC 60747-5-5, DIN EN 60747-5-2(VDE 0884 Teil 2)
• Qualified to AEC-Q100 Test Guidelines
• Automotive Operating Temperature -40 to 125°C
• Advanced Sigma-Delta (Σ - Δ) A/D Converter Technology
• Fully Differential Circuit Topology