AP3771BK6TR-BG1

Overview

The AP3771BK6TR-BG1 is a high-performance AC/DC power supply controller designed for battery charger and adapter applications. It utilizes primary side regulation to achieve accurate output voltage control without requiring an optocoupler or secondary-side feedback loop, thereby reducing component count and system cost. The device operates in a low-power off-line configuration, featuring pulse width modulation for efficient energy transfer. It integrates essential protection mechanisms including overvoltage, overcurrent, and thermal shutdown to ensure reliable operation under fault conditions.

Feature Summary

• Primary side regulation architecture eliminates the need for optocouplers and secondary feedback components
• Integrated protection features include overvoltage, overcurrent, and thermal shutdown capabilities
• Optimized for low-power offline applications such as battery chargers and adapters
• Pulse width modulation control ensures stable performance across varying load conditions

Applications

• Battery charger systems
• AC/DC adapter designs
• Low-power offline power supplies

Procurement Notes

Verify the exact suffix BG1 against the manufacturer's current datasheet to confirm pinout compatibility and electrical specifications. Ensure the source document explicitly lists this part number as active or available, as legacy suffixes may indicate obsolete variants. Cross-reference the package marking code GJJ with official Diodes Incorporated documentation to prevent substitution errors during assembly.

Selection Notes

Select this controller for designs prioritizing cost reduction through simplified secondary circuits. It is suitable for applications where moderate isolation accuracy is acceptable without optocoupler feedback. Consider the SOT-26 package constraints for thermal management and PCB layout. Validate that the input voltage range and power requirements align with the controller's operational limits defined in the official specification sheet.

Part Context

This component belongs to the AP3771 series of AC/DC controllers from Diodes Incorporated. It is specifically engineered for primary side regulation, offering a compact solution for isolated power conversion. The SOT-26 package provides a small footprint suitable for space-constrained consumer electronics and portable charging devices.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with alternative primary side regulation controllers by comparing pin configurations, operating voltages, and protection thresholds directly from manufacturer datasheets.