AP3981B2S7-13

Overview

The AP3981B2S7-13 is an AC/DC converter switcher from Diodes Incorporated, integrating a primary-side regulation controller and an N-channel power MOSFET. It utilizes a flyback topology to achieve precise constant current (CC) and constant voltage (CV) without requiring an optocoupler. The device operates in peak current amplitude modulation (AM) and pulse frequency modulation (PFM) modes to optimize efficiency and reduce audible noise. Key electrical specifications include a maximum output power of 7.5 W, a supply voltage range of 10 V to 28 V, and isolation capabilities. It functions within a temperature range of -40°C to +85°C and is housed in an SO-7 package.

Feature Summary

• Integrates primary-side regulation controller with N-channel power MOSFET for compact design
• Eliminates the need for optocouplers while maintaining precise CC and CV control
• Operates in AM and PFM modes to ensure high average efficiency across power ranges
• Provides comprehensive protection including OVP, UVP, OTP, and cycle-by-cycle current limiting

Applications

• Router power supplies
• Set-top box (STB) power adapters
• Network adapter circuits

Procurement Notes

Verify the specific suffix 'BS7' against official datasheets to confirm pinout compatibility and thermal characteristics. Confirm RoHS compliance status through manufacturer documentation before integration. Ensure the SO-7 package footprint matches the target PCB layout requirements. Validate that the 7.5 W output rating aligns with the specific application load demands.

Selection Notes

Select this component for isolated flyback designs requiring simplified bill of materials by removing optocouplers. Suitable for applications prioritizing cost reduction and board space optimization. Consider the integrated MOSFET ratings when designing for peak current loads. Evaluate the operating temperature range suitability for the intended environmental conditions.

Part Context

This part belongs to the AP3981 series of AC/DC converters manufactured by Diodes Incorporated. The series focuses on primary-side regulation solutions for low-power applications. Variants within the series differ primarily in packaging options such as SO-7 or SO-8, allowing flexibility in thermal management and assembly processes.

Replacement Considerations

Consult official substitution guides for equivalent PSR switchers. Verify functional compatibility regarding pin assignments and control logic. Ensure replacement parts meet the same isolation and safety certification requirements.