MP172GJ-Z

AC DC Converters, Offline Switchers Overview

The MP172GJ-Z is a non-isolated, primary-side regulated offline switching controller manufactured by Monolithic Power Systems. It integrates a 700V MOSFET and an internal current source to support Buck, Boost, Buck-Boost, and Flyback topologies without requiring optocouplers. The device provides precise constant voltage regulation with a maximum output current of 120mA in CCM and 80mA in DCM. It features frequency folding for high efficiency at light loads and includes comprehensive protection mechanisms such as over-temperature shutdown, UVLO, OLP, SCP, and open-loop protection.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700V MOSFET and current source for simplified circuit design
• Enables primary-side constant voltage regulation without optocouplers
• Supports multiple topologies including Buck, Boost, Buck-Boost, and Flyback
• Features frequency folding to maximize average efficiency under light load conditions

AC DC Converters, Offline Switchers Applications

• Home appliances
• Standby power supplies
• Low-power offline applications

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'GJ' against the manufacturer's official datasheet to confirm package type and tape/reel specifications. Confirm that the component status remains active for new designs, as MPS may recommend alternative parts like the MP172A for updated requirements. Ensure compatibility with the intended topology and thermal management constraints before finalizing procurement.

AC DC Converters, Offline Switchers Selection Notes

Select this component for low-power offline designs requiring isolation-free regulation. The integrated 700V switch reduces external component count. Evaluate the trade-off between the 120mA maximum output current and the required power budget. Consider the TSOT23-5 or SOIC-8 package availability relative to PCB space constraints and thermal dissipation needs.

AC DC Converters, Offline Switchers Part Context

The MP172 belongs to a family of non-isolated offline regulators designed to replace traditional isolated solutions where safety regulations permit. It simplifies the bill of materials by combining the driver, controller, and power switch into a single package. This integration targets cost-sensitive consumer electronics and auxiliary power supplies.

AC DC Converters, Offline Switchers Replacement Considerations

Public documentation identifies the MP172A as the recommended alternative for new designs due to improved EMI performance. Verify if existing inventory of the MP172 is sufficient for production runs before transitioning to the newer variant.