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.