FSL306LRN

AC DC Converters, Offline Switchers Overview

The onsemi FSL306LRN is an integrated offline switch combining a PWM controller and a 650V avalanche-rated SenseFET. Designed for non-isolated buck, boost, and flyback SMPS topologies, it operates at a fixed frequency of 50 kHz with spread spectrum modulation to reduce EMI. The device features a high-voltage startup regulator that enables operation without auxiliary bias windings, achieving low standby power consumption of 25 mW with external bias or 120 mW without. It includes a transconductance amplifier for feedback control, adjustable peak current limiting, and comprehensive protection mechanisms including OVP, OLP, TSD, and AOCP.

AC DC Converters, Offline Switchers Feature Summary

• Integrated high-voltage startup regulator eliminates the need for auxiliary bias windings
• Built-in avalanche-rated 650V SenseFET ensures robust performance under high voltage stress
• Spread spectrum frequency modulation reduces electromagnetic interference emissions
• Transconductance amplifier simplifies feedback compensation circuit design

AC DC Converters, Offline Switchers Applications

• Non-isolated AC/DC power supplies for IoT sensors
• Powering RF transceivers in standalone modules
• Microprocessor supply units in space-constrained designs

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'N' corresponds to the DIP-7 package configuration as documented in official datasheets. Confirm RoHS compliance status through manufacturer material composition declarations. Ensure ordering documentation matches the exact part number to avoid package discrepancies.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring minimal external components and simplified transformerless or non-isolated architectures. The integrated high-voltage regulator suits applications where adding auxiliary windings is impractical. Consider the 50 kHz fixed frequency when sizing magnetic components for optimal efficiency and size trade-offs.

AC DC Converters, Offline Switchers Part Context

The FSL306LRN belongs to the FSL306LR series of intelligent power switches from onsemi. This family targets cost-sensitive, high-efficiency offline power conversion needs. The N suffix typically denotes the through-hole DIP-7 package variant, distinguishing it from surface-mount options like the LRLX LSOP version within the same functional family.

AC DC Converters, Offline Switchers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.