NCP4308DDR2G

Power Supply Controllers, Monitors Overview

The NCP4308DDR2G is a secondary-side synchronous rectification controller designed for high-efficiency switch-mode power supplies. It supports Flyback, Forward, and Half-Bridge LLC topologies with a single output channel. The device operates within a supply voltage range of 4V to 25V and features a switching frequency of 1 MHz. Key electrical parameters include a maximum duty cycle of 50%, an output voltage of 9.5 V, and an output current capability of 8 A. It functions reliably across a temperature range of -40°C to +125°C.

Power Supply Controllers, Monitors Feature Summary

• Supports multiple SMPS topologies including DCM/CCM flyback, quasi-resonant flyback, forward, and half-bridge resonant LLC.
• Features self-synchronization for reliable and noiseless operation of the synchronous rectification system.
• Utilizes Kelvin connection of the driver to the MOSFET to achieve high efficiency at full load.
• Includes externally adjustable minimum off-time and on-time blanking periods to mitigate ringing.

Power Supply Controllers, Monitors Applications

• High-efficiency AC-DC adapters
• Laptop power supplies
• Flyback converter designs
• Forward converter applications
• Half-bridge resonant LLC converters

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix DDR2G against the manufacturer's official datasheet to confirm package type and RoHS compliance status. Ensure that the ordering information matches the required SOIC-8 package dimensions and moisture sensitivity level specifications. Cross-reference the part number with authorized distributors to confirm availability and authenticity before finalizing procurement orders.

Power Supply Controllers, Monitors Selection Notes

Select this component for applications requiring precise control of synchronous rectifier MOSFETs in various power topologies. Consider its ability to handle light-load detection and its compatibility with GaN devices if higher performance is needed. Evaluate the external adjustability of timing parameters to ensure it meets the specific PCB layout and parasitic requirements of the target design.

Power Supply Controllers, Monitors Part Context

This part belongs to the NCP4308 series of secondary-side controllers from onsemi. It is engineered to replace traditional diode rectifiers in switch-mode power supplies to improve overall system efficiency. The series is tailored for modern power adapters where size, weight, and energy consumption are critical design constraints.

Power Supply Controllers, Monitors Replacement Considerations

The NCP4305DDR2G is a related alternative within the same product family offering similar synchronous rectification capabilities for various SMPS topologies.