1 Features

1• 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 false•

Minimal Component Count

2 Applications

• AC-to-DC 5-V Adapters

• 5-V Bias Supplies

• Low Voltage Rectification Circuits

• Flyback and LLC Converters

3 Description

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.