AP3771BK6TR-G1

Overview

The AP3771BK6TR-G1 is a primary side regulated switching mode power supply controller designed for battery charger and adapter applications. It operates in flyback topology with an integrated high-voltage startup circuit. The device supports quasi-resonant operation to reduce switching losses and electromagnetic interference. Key electrical parameters include a fixed switching frequency of 80 kHz, a Vcc operating range of 6.8V to 35V, and a startup voltage threshold of 15.5V. It features comprehensive protection mechanisms including over-temperature, over-voltage, and short-circuit protection. The component is housed in a SOT-26 surface-mount package and is rated for a junction temperature range of -40°C to 150°C.

Feature Summary

• Primary side regulation architecture eliminates the need for optocouplers and secondary-side feedback components.
• Integrated high-voltage startup circuit simplifies design by removing external startup resistors.
• Quasi-resonant switching capability reduces acoustic noise and improves efficiency at light loads.
• Built-in fault protection ensures reliability against thermal runaway, output over-voltage, and load shorts.

Applications

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

Procurement Notes

Verify the specific suffix 'BK6' corresponds to the required tape and reel packaging configuration for automated assembly. Confirm that the 'G1' designation aligns with current environmental compliance standards such as RoHS3 and REACH requirements for your target market. Check the manufacturer's latest product change notification to ensure no recent pinout or electrical specification updates affect your existing design validation. Ensure the supplier provides valid traceability documentation for the SOT-26 package lot codes.

Selection Notes

Select this component when designing cost-sensitive AC/DC converters where isolation feedback complexity must be minimized. It is suitable for applications requiring moderate power levels where primary side regulation accuracy is acceptable. Consider the 80 kHz switching frequency for balancing EMI filtering requirements and transformer size. Evaluate the thermal performance within the SOT-26 package against the expected ambient temperature conditions to ensure the junction temperature remains within the specified 150°C limit during continuous operation.

Part Context

This part belongs to the AP3771 family of offline switcher controllers from Diodes Incorporated. It is specifically engineered for low-power applications replacing traditional discrete solutions. The BK6 variant denotes the specific packaging and marking code used for mass production. It serves as a direct replacement for older generation primary side regulation ICs in standard flyback converter topologies.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Verify compatibility with alternative primary side regulation controllers only through detailed datasheet cross-referencing of pinouts and electrical characteristics.

FAQ

Does the AP3771BK6TR-G1 require an optocoupler for feedback?

No, it utilizes primary side regulation, which eliminates the need for an optocoupler and auxiliary winding feedback network.

What is the maximum junction temperature rating?

The maximum junction temperature (TJ) is rated at 150°C.