LT3511EMS#PBF

Overview

The LT3511EMS#PBF is a monolithic high-voltage isolated flyback converter designed for boundary mode operation. It features an internal 240mA, 150V power switch and accepts input voltages from 4.5V to 100V. The device eliminates the need for a transformer third winding or opto-isolator by utilizing primary-side regulation. Packaged in a 16-lead TFSOP (MSOP) with a 3.00mm width, it integrates switching control and power stages into a single compact solution.

Feature Summary

• Eliminates requirement for transformer third winding or opto-isolator through primary-side regulation
• Integrates high-voltage 150V power switch capable of delivering 240mA output current
• Operates in boundary mode to optimize efficiency across varying load conditions

Applications

• Isolated DC/DC conversion systems requiring simplified transformer design
• Industrial control applications with wide input voltage ranges
• Power supplies for communication equipment needing galvanic isolation

Procurement Notes

Verify the specific package variant matches the required footprint, as Analog Devices offers both tube and tape-and-reel options. Confirm that the #PBF suffix indicates lead-free compliance if environmental standards are mandatory. Ensure the supplier provides original manufacturer documentation to validate authenticity and traceability before finalizing orders.

Selection Notes

Select this component when primary-side regulation is sufficient for the application's accuracy requirements. It is suitable for designs where minimizing external components and transformer complexity is prioritized. Consider the 150V switch rating against peak reflected voltages to ensure reliable operation under all line and load transients without exceeding device limits.

Part Context

This part belongs to Analog Devices' family of high-voltage flyback controllers. It shares functional similarities with the LT3512 but differs in topology and current capabilities. The LT3511 focuses on isolated flyback applications, whereas other variants may address non-isolated step-down needs. It represents a specialized solution for cost-sensitive isolated power designs.

Replacement Considerations

LT3512EMSPBF is a related component within the same product family. Verify compatibility regarding switching frequency and control loop characteristics before substitution.