SRK2000A

Power Supply Controllers, Monitors Overview

The SRK2000A is a smart driver implementing secondary side synchronous rectification control for LLC resonant converters with center-tap secondary windings. It provides two high-current gate drive outputs capable of driving N-channel Power MOSFETs, featuring interlocking logic to prevent simultaneous conduction. The device operates within a voltage range of 4.5 to 32 V and supports frequencies up to 500 kHz. Quiescent consumption is 250 µA. It includes programmable UVLO with hysteresis and an intelligent automatic sleep mode that reduces power consumption at light loads by stopping gate driving when synchronous rectification becomes inefficient.

Power Supply Controllers, Monitors Feature Summary

• Intelligent automatic sleep mode for improved efficiency at light load conditions
• Dual gate driver with interlocking logic preventing simultaneous MOSFET conduction
• Adaptive switching synchronized with transformer half-winding current flow
• Matched turn-off thresholds ensuring balanced performance across rectifiers

Power Supply Controllers, Monitors Applications

• Secondary side synchronous rectification in LLC resonant converters
• Full-wave rectification using transformers with center-tap secondary windings
• High-efficiency power supplies requiring low quiescent current operation

Power Supply Controllers, Monitors Procurement Notes

Verify the specific package type and marking code against the official datasheet before integration. Confirm that the application topology utilizes a center-tapped secondary winding suitable for the dual-gate architecture. Ensure the operating frequency remains within the 500 kHz limit and the supply voltage stays between 4.5 V and 32 V. Check for compatibility with N-channel MOSFETs regarding gate drive current requirements.

Power Supply Controllers, Monitors Selection Notes

Select this component for LLC resonant topologies requiring optimized light-load efficiency through automatic sleep modes. It is specifically designed for center-tapped secondary configurations rather than full-bridge or half-bridge layouts without center taps. Consider the 1 A source and 3.5 A sink drive currents when sizing external MOSFETs. Evaluate the need for matched turn-off thresholds to ensure symmetrical rectifier behavior under varying load conditions.

Power Supply Controllers, Monitors Part Context

The SRK2000A belongs to a family of synchronous rectification controllers designed to replace traditional diodes in high-efficiency power conversion systems. It complements primary-side resonant controllers like the L6699 in complete converter architectures. The device addresses efficiency losses associated with diode forward voltage drops by actively controlling MOSFET gates based on precise timing and current detection algorithms.

Power Supply Controllers, Monitors Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.