LT1424CS8-9#PBF

Overview

The LT1424CS8-9#PBF is a monolithic high-power switching regulator designed for isolated flyback topologies. It operates with an input voltage range of 3 V to 20 V and provides a fixed 9 V output at up to 200 mA. The device integrates a high-current switch, oscillator, and control circuitry, eliminating the need for opto-isolators or tertiary windings by sensing output voltage directly from the primary side flyback waveform. It features current-mode control with pulse width modulation and operates at a switching frequency of 285 kHz.

Feature Summary

• Integrated primary-side sensing eliminates the requirement for opto-isolators or tertiary feedback windings
• Monolithic design combines high-efficiency power switch with complete oscillator and protection circuitry
• Current-mode control architecture ensures stable regulation in isolated flyback applications

Applications

• Isolated DC-DC conversion for industrial instrumentation
• Power supplies for medical equipment requiring galvanic isolation
• Telecommunications interface circuits needing isolated rails

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS status against the manufacturer's latest documentation. Confirm the SOIC-8 package dimensions match your PCB footprint requirements. Ensure the fixed 9 V output aligns with system voltage needs as adjustment is not supported. Cross-reference the manufacturer part number with authorized distributors to confirm authenticity and supply chain integrity.

Selection Notes

Select this component when a fixed 9 V isolated output is required without external feedback components. It is suitable for designs prioritizing simplicity and reduced bill of materials over adjustable outputs. Consider the 200 mA output current limit and 285 kHz switching frequency for thermal and EMI management. Verify that the 3 V to 20 V input range covers the intended operating conditions.

Part Context

This part belongs to the LT1424 family of isolated flyback regulators from Analog Devices. It shares functional similarities with other variants in the series but differs in output voltage and package type. The CS8-9 designation specifies the commercial temperature range and SOIC-8 surface-mount package, distinguishing it from through-hole DIP versions like the LT1424CN8-9.

Replacement Considerations

LT1424CS8-9#TRPBF offers the same electrical characteristics in tape-and-reel packaging for automated assembly.