AP3771AK6TR-G1

Overview

The AP3771AK6TR-G1 is a high-performance AC/DC power supply controller from Diodes Incorporated, designed for battery charger and adapter applications. It utilizes primary side regulation technology to achieve low-power operation without requiring an optocoupler or secondary-side feedback components. The device integrates a high-voltage startup circuit and operates within a wide supply voltage range of 3.5V to 30V. Packaged in a compact SOT-26 (SOT-23-6) surface-mount package, it supports flyback topologies with integrated protection features including overvoltage, short circuit, and open loop detection.

Feature Summary

• Primary side regulation architecture eliminates the need for optocouplers and TL431 references, reducing component count and improving reliability.
• Integrated high-voltage startup circuit enables direct connection to the main bus without external startup resistors.
• Comprehensive protection mechanisms include cycle-by-cycle current limiting, overvoltage protection, and open-loop fault detection.

Applications

• Battery chargers for mobile devices and consumer electronics
• Low-power AC/DC adapters for IoT devices
• Standby power supplies for home appliances

Procurement Notes

Verify the specific suffix 'G1' against the manufacturer's latest datasheet to confirm pinout and electrical specifications, as suffixes can indicate variations in packaging or compliance status. Confirm availability status, as this part may be subject to end-of-life notices or obsolescence warnings. Ensure the ordering quantity aligns with the manufacturer's standard reel size requirements to avoid additional handling fees or minimum order constraints.

Selection Notes

Select this controller for designs prioritizing cost reduction through primary side regulation and minimal external component count. It is suitable for isolated flyback converters where moderate accuracy is acceptable. Consider thermal performance in the SOT-26 package when designing for higher power densities. Verify that the input voltage range and output power requirements fall within the device's operational limits defined in the official specification sheet.

Part Context

This component belongs to the AP3771 family of AC/DC controllers from Diodes Incorporated, specifically engineered for Gen 3 continuous conduction mode applications. It serves as a drop-in replacement for legacy controllers in low-power adapter designs, offering improved efficiency and reduced standby power consumption compared to older generations.

Replacement Considerations

AP3771AK6TR-BG1 is listed as a variant with potential differences in packaging or compliance markings; verify functional equivalence before substitution.