基于UCC24610 型號的二次側(cè)同步整流器控制器

　　描述

　　This GREEN Rectifier controller is a high-performance controller and driver for standard and logic-level N-channel MOSFET power devices used for low-voltage secondary-side synchronous rectification.

　　The combination of controller and MOSFET emulates a near-ideal diode rectifier. This solution not only directly reduces power dissipation of the rectifier but also indirectly reduces primary-side losses as well, due to compounding of efficiency gains.

　　Using drain-to-source voltage sensing, the UCC24610 is ideal for Flyback and LLC-resonant power supplies but can also be used with other power architectures. The UCC24610 is optimized for output voltages from 4.5 V to 5.5 V, and is suitable for use with lower and higher output voltages as well.

　　The UCC24610 offers a programmable false-triggering filter, a programmable timer to automatically switch to light-load mode at light load, and a SYNC input for optional use in continuous conduction mode (CCM) systems. Protection features on TON and EN/TOFF pins prevent run-away on-time due to open-circuit or short-circuit fault conditions.

　　This device is available in an 8-pin SOIC package and an 8-pin, 3.0-mm × 3.0-mm SON package with an exposed thermal pad.

　　特性

　　Secondary-Side Controller Optimized for 5-V Systems

　　Up to 600-kHz Operating Frequency

　　VDS MOSFET-Sensing

　　1.6-Ω Sink, 2.0-Ω Source Gate-Drive Impedances

　　Micro-Power Sleep Current for 90+ Designs

　　Automatic Light-Load Management

　　Synchronous Wake-Up From Sleep and Light-Load Modes

　　Protection Features on Programming Inputs

　　SYNC Input for CCM Operation

　　20-ns Typical Turnoff Propagation Delay

　　Improved Efficiency and Design Flexibility Over Traditional Diode Solution

　　May Be Biased Directly From 5-V Output

　　Minimal Component Count

　　APPLICATIONS

　　AC-to-DC 5-V Adapters

　　5-V Bias Supplies

　　Low Voltage Rectification Circuits

　　Flyback and LLC Converters

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