LM34925SDX/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM34925SDX/NOPB is a synchronous buck switching regulator IC from Texas Instruments, designed for secondary-side bias regulation in isolated DC-DC converters. It features an integrated high-voltage startup circuit and operates with an input voltage range of 7.5 V to 100 V. The device provides a single adjustable output voltage starting from 1.225 V, delivering up to 100 mA of output current. It supports a fixed switching frequency of 1 MHz and functions reliably within a junction temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a high-voltage startup circuit for direct connection to primary-side auxiliary windings
• Provides synchronous rectification for improved efficiency in secondary-side bias applications
• Features adjustable switching frequency capability up to 1 MHz for optimized component size

Voltage Regulators - DC DC Switching Regulators Applications

• Secondary-side bias regulation for isolated flyback converters
• Auxiliary power supply generation in offline LED drivers
• Bias winding regulation in industrial power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific package suffix against ordering requirements, as SDX denotes tape and reel packaging while SD indicates tube packaging. Confirm RoHS compliance status and ensure the selected variant matches the required thermal performance for the target application environment. Cross-reference datasheet revisions to validate pinout consistency.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing isolated power supplies requiring a compact secondary-side bias solution. The 100 mA output current suits low-power control circuits. Ensure the primary auxiliary winding can support the startup current demands. Evaluate thermal dissipation capabilities within the WSON-8 package for the expected ambient conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM34925 family of integrated bias regulators. It shares functional similarities with the LM34927 but differs in output current capacity and package options. The LM34925 series addresses the need for simplified bias design in high-voltage isolated topologies by integrating startup and regulation functions.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM34925SD/NOPB is a parameter-equivalent alternative available in tube packaging instead of tape and reel.