L4984DTR

Overview

The L4984DTR is a current-mode Power Factor Correction (PFC) controller utilizing line-modulated fixed-off-time (LM-FOT) control. It operates in continuous conduction mode (CCM) to provide fixed-frequency operation for boost PFC converters. The device features a proprietary LM-FOT modulator, a highly linear multiplier with crossover distortion reduction, and a voltage feedforward function for improved transient response. It includes an accurate internal voltage reference, soft-start, and comprehensive protection functions such as overvoltage, brownout, and inductor saturation handling. The IC is housed in a 10-pin SSOP package.

Feature Summary

• Proprietary LM-FOT modulator enables nearly fixed-frequency operation in CCM boost converters
• Integrated THD optimizer circuit reduces AC input current crossover distortion
• Fast bidirectional input voltage feedforward improves line transient response
• Totem pole output stage provides high drive capability for power switches

Applications

• Boost PFC pre-regulators for EN61000-3-2 compliance
• Power supplies for desktop computers and workstations
• EV battery chargers for light electric vehicles
• Solar inverters and data center SMPS

Procurement Notes

Verify the specific suffix 'TR' indicates tape-and-reel packaging when sourcing components. Confirm that the base part number corresponds to the STMicroelectronics L4984D specifications. Ensure compatibility with the required 10-pin SSOP footprint during procurement planning.

Selection Notes

Select this component for applications requiring high power factor correction in the few hundred watts to 1 kW range. It is suitable for designs needing robust protection against mains surges and feedback loop failures. Consider its drive capability for large MOSFETs or IGBTs in high-power density systems.

Part Context

The L4984DTR belongs to the L4984 family of CCM PFC controllers from STMicroelectronics. It is designed as a low-cost solution for mid-to-high power switch-mode power supplies. The device addresses energy saving requirements and offers a trade-off between performance, feature set, and form factor.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pinout and electrical characteristics if considering alternative PFC controllers from other manufacturers.