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銆�銆�A 90-W, High-Efficiency, LLC Series-Resonant Converter with Secondary-Side Synchronous Rectification

銆�銆�The UCC24610 Green Rectifier Controller is optimized for 5-V systems and can be used for LLC outputs up to 15 V when a separate 5-V supply is available. Above 15 V the UCC24610 is limited by the 50-V maximum voltage rating of the VD pin. This is because in a conventional secondary rectifier arrangement, that employs two rectifiers with a center-tapped secondary winding, each rectifier sees a peak reverse voltage equal to twice the regulated output.

銆�銆�The scope of this reference design guide is to describe the design and performance of a functional circuit that extends the application of the UCC24610 to systems with output voltages up to 30 V. This is achieved using an alternate topology for secondary rectification and addressing the design constraints that the topology presents. Two configurations are described for synchronizing the turn-off of each SR circuit using the gate-drive signals on the primary side of the converter.

銆�銆�An area not addressed by this guide is electromagnetic compatibility (EMC). For most applications, EMI filter components are added so that the design meets applicable environmental and system compatibility requirements.

銆�銆�To comply with EMC standards, components such as input and output filters are required to suppress electromagnetic interference (EMI).

銆�銆�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.

銆�銆�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.

銆�銆�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.

銆�銆�UCC24610涓昏�佺壒鎬э細

銆�銆�Secondary-Side Controller Optimized for 5-V Systems

銆�銆�Up to 600-kHz Operating Frequency

銆�銆�VDS MOSFET-Sensing

銆�銆�1.6-ohm Sink, 2.0-ohm Source Gate-Drive Impedances

銆�銆�Micro-Power Sleep Current for 90+ Designs

銆�銆�Automatic Light-Load Management

銆�銆�Synchronous Wake-Up From Sleep and Light-Load Modes

銆�銆�Protection Features on Programming Inputs

銆�銆�SYNC Input for CCM Operation

銆�銆�20-ns Typical Turn-Off Propagation Delay

銆�銆�Improved Efficiency and Design Flexibility Over Traditional Diode Solution

銆�銆�May Be Biased Directly From 5-V Output

銆�銆�Minimal Component Count

銆�銆�UCC24610鎳夌敤锛�

銆�銆�AC/DC 5-V Adapters

銆�銆�5-V Bias Supplies

銆�銆�Low Voltage Rectification Circuits

銆�銆�Flyback and LLC Converters

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