FOD2712AR2

Overview

The FOD2712AR2 is an optically isolated error amplifier from onsemi, designed for high-precision feedback control in power conversion systems. It integrates a GaAs infrared LED with a monolithic NPN phototransistor output stage featuring a built-in reference voltage of 1.24 V. The device operates within a temperature range of -40°C to +85°C and provides 2500 Vrms isolation. Key electrical parameters include a forward voltage of 1.5 V, a current transfer ratio of 100% at 10 mA, a maximum collector current of 50 mA, and a collector-emitter saturation voltage of 400 mV. It is housed in an 8-SOIC surface-mount package.

Feature Summary

• Integrates a precision 1.24 V reference voltage directly into the phototransistor output stage for accurate error sensing.
• Provides galvanic isolation between input and output circuits with a rated insulation voltage of 2500 Vrms.
• Utilizes a monolithic NPN phototransistor design to ensure stable signal transmission and low saturation voltage.

Applications

• Switched-mode power supply (SMPS) primary-side regulation
• Flyback converter feedback loops
• Isolated DC-to-DC converter control circuits

Procurement Notes

Verify that the ordering suffix 'R2' corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the component meets RoHS compliance standards as specified by the manufacturer. Ensure that the SOIC-8 footprint matches the PCB layout constraints. Check datasheet specifications for thermal dissipation limits under continuous operation conditions to prevent overheating during procurement validation.

Selection Notes

Select this component when a dedicated error amplifier function is required within an optocoupler to simplify circuit topology. The integrated 1.24 V reference eliminates the need for external voltage references, reducing component count. Consider the 2500 Vrms isolation rating for safety-critical applications requiring robust barrier protection. Evaluate the 100% minimum current transfer ratio to ensure sufficient gain for the specific feedback loop requirements.

Part Context

The FOD2712AR2 belongs to the FOD2712A series of isolated error amplifiers manufactured by onsemi. This series is engineered specifically for applications demanding precise voltage regulation across isolation barriers. The part represents a specialized variant within the broader optocoupler family, distinguished by its internal reference voltage integration rather than serving as a standard digital or analog signal coupler.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing designs before considering alternative sources.