NCP4307FBSNT1G

Power Supply Controllers, Monitors Overview

The NCP4307FBSNT1G is a secondary side synchronous rectification driver designed for high-efficiency switch-mode power supplies. It features self-supply from an internal 200V CS pin, enabling high-side configuration and low VOUT operation without auxiliary supply. The device includes dual VCC pins to select the optimal source and minimize losses. Key electrical parameters include a 35V supply voltage rating, 7A/2A peak current sink/source drive capability, and a 10.5ns ultra-fast turn-off trigger interface. It operates within a temperature range of -40°C to 125°C TJ.

Power Supply Controllers, Monitors Feature Summary

• Self-supplying architecture utilizing an internal 200V CS pin eliminates the need for auxiliary power supplies in high-side or low-output voltage configurations.
• Dual VCC pin design allows selection of the optimal voltage source to minimize conduction losses across wide output voltage ranges.
• Integrated self-synchronization ensures reliable noiseless operation by detecting transformer reset signals directly.
• Internal minimum off-time and on-time blanking periods mitigate ringing induced by PCB layout parasitics.

Power Supply Controllers, Monitors Applications

• DCM or CCM flyback converters
• Quasi-resonant flyback topologies
• Active clamp flyback applications
• Forward converter designs

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix 'FB' against the manufacturer's official ordering information sheet to confirm pinout and functional variations relative to other NCP4307 variants. Ensure the component meets RoHS3 compliance requirements for the target assembly process. Cross-reference the datasheet revision history for any updates to electrical characteristics or recommended operating conditions prior to finalizing the bill of materials.

Power Supply Controllers, Monitors Selection Notes

Select this component for applications requiring precise zero-current detection and high efficiency in isolated power supplies. The dual VCC feature is critical for optimizing performance in USB Power Delivery and wide-range output adapters. Consider the 7A/2A drive strength for driving larger synchronous MOSFETs. Evaluate the self-supply capability to reduce system complexity and component count compared to traditional gate drivers requiring separate bias windings.

Power Supply Controllers, Monitors Part Context

The NCP4307 series serves as a specialized secondary side controller within onsemi's portfolio of power management integrated circuits. It addresses the efficiency limitations of traditional diode rectification in modern high-density power adapters. The family supports various packaging options including TSOP-6, catering to different thermal and spatial constraints in consumer electronics and industrial power supply designs.

Power Supply Controllers, Monitors Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing control ICs when considering alternative secondary side drivers.