L6598

AC DC Converters, Offline Switchers Overview

The L6598 is a resonant controller manufactured using BCD offline technology, designed for half-bridge topologies. It features a high-voltage rail up to 600 V and dV/dt immunity of ±50 V/ns across the full temperature range. The device includes a driver with 250 mA source and 450 mA sink current capabilities, achieving switching times of 80 ns rise and 40 ns fall with a 1 nF load. It supports soft-start frequency shifting timing and offers an error amplifier for closed-loop control. Available in DIP16 and SO16 packages.

AC DC Converters, Offline Switchers Feature Summary

• Integrated high-voltage rail supporting up to 600 V operation
• High dV/dt immunity ensuring robust performance under varying conditions
• Dedicated timing section for setting soft-start time and minimum frequency
• Built-in bootstrap diode and Zener clamping to minimize external components

AC DC Converters, Offline Switchers Applications

• AC/DC adapters
• Half-bridge LLC multi-resonant SMPS designs
• Power supplies requiring zero voltage switching operation

AC DC Converters, Offline Switchers Procurement Notes

Verify package availability as the component is offered in both DIP16 and SO16 configurations. Confirm that the selected variant aligns with the specific PCB layout requirements for the intended application. Ensure compliance with RoHS standards where applicable. Cross-reference datasheet specifications against system constraints before finalizing procurement decisions.

AC DC Converters, Offline Switchers Selection Notes

Select this controller for applications utilizing classical half-bridge topologies where resonant operation benefits are desired. Consider the integrated bootstrap diode and Zener clamping features when evaluating bill-of-materials complexity. Verify that the driver current capability meets the gate charge requirements of the target power MOSFETs for optimal switching performance.

AC DC Converters, Offline Switchers Part Context

The L6598 represents STMicroelectronics' first generation of resonant controllers. It serves as a primary controller for dual-end (half-bridge) topologies, offering high efficiency and anti-interference capabilities through zero voltage switching. This series laid the foundation for subsequent generations like the L6599, which introduced higher frequencies and additional protection features.

AC DC Converters, Offline Switchers Replacement Considerations

The L6599 and L6599A are documented successors within the same family. These newer models offer improved operating frequencies up to 500 kHz, burst mode operation for light loads, and enhanced protection characteristics such as secondary overcurrent protection and brown-out detection.