FAN7631SJX

Power Supply Controllers, Monitors Overview

The FAN7631SJX is a Pulse Frequency Modulation (PFM) controller designed for high-efficiency half-bridge resonant converters, including LLC topologies. It integrates a high-side gate driver with +500 mA/-1000 mA output current capability and operates at switching frequencies up to 600 kHz. The device supports a supply voltage range of 11.1 V to 21 V and functions within an operating temperature range of -40°C to 130°C. It features programmable dead time via a single resistor and includes comprehensive protection mechanisms such as overvoltage, overload, overcurrent, and thermal shutdown.

Power Supply Controllers, Monitors Feature Summary

• Enables Zero Voltage Switching (ZVS) to minimize switching losses and electromagnetic interference noise.
• Integrates a high-current gate driver capable of sourcing 500 mA and sinking 1000 mA.
• Supports flexible protection modes using FI or LS pins for latch or auto-restart functionality.
• Optimizes light-load efficiency through pulse skipping and intermittent mode operation.

Power Supply Controllers, Monitors Applications

• LLC resonant converter designs
• Series resonant converter architectures
• Parallel resonant converter implementations

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix SJX against the manufacturer's official documentation to confirm package type and tape-and-reel specifications. Confirm end-of-life status and obsolescence dates prior to finalizing design-in decisions. Ensure compatibility with existing PCB footprints for the 16-SOP package. Validate that all electrical parameters meet the system requirements before procurement.

Power Supply Controllers, Monitors Selection Notes

Select this component for applications requiring high-frequency resonant conversion with integrated gate driving capabilities. The fixed 50% duty cycle control suits half-bridge topologies exclusively. Consider the wide operating temperature range for industrial environments. Evaluate the need for remote on/off control and specific protection locking behaviors when configuring external components.

Power Supply Controllers, Monitors Part Context

This part belongs to the FAN7631 series of PFM controllers manufactured by onsemi. It is specifically engineered for resonant power supplies where efficiency and size reduction are critical. The device simplifies design by combining control logic and gate driving in a single package, reducing component count compared to discrete solutions.

Power Supply Controllers, Monitors Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify pin-to-pin compatibility and electrical parameter equivalence with alternative devices from other manufacturers if replacement is necessary.

Power Supply Controllers, Monitors FAQ

What types of resonant converter topologies does the FAN7631 support?

The FAN7631 supports half-bridge resonant converter topologies, including series resonant, parallel resonant, and LLC resonant converters.

How is the dead time configured in the FAN7631?

The dead time is programmable using a single external resistor connected to the device.

What protection features are included in the FAN7631?

The device includes overvoltage protection (OVP), overload protection (OLP), overcurrent protection (OCP), abnormal overcurrent protection (AOCP), internal thermal shutdown (TSD), and line under-voltage lockout (LUVLO).