1 Features
1• Supports Topologies such as Active Clamp
Flyback, QR, DCM, CCM Flyback and LLC
• MOSFET VDS Sensing up to 230 V
• Operating Frequency Up to 1 MHz
– 1 MHz for UCC24612-1
– 800 kHz for UCC24612-2
• Wide VDD Range Allows for Direct Bias from 5-V
to 28-V Output Systems
• 4-A Sink, 1-A Source Gate Driver with
Proportional Gate Drive
• Adaptive Minimum Off-time for Increased Noise
Immunity
• Cycle Limit Pre-Turn-off Improves Efficiency in
CCM
• High or Low-Side Configurable
• Automatic Light-Load and Sleep-Mode
Management with 320-μA standby current
• 16-ns Typical Turnoff Propagation Delay
• 9.5-V Gate Drive Clamp for Reduced Driving Loss

2 Applications
• AC-to-DC Adapters
• USB Type-C and Power Delivery AC Adapters
• Server and Telecom Power Supply
• AC-to-DC Auxiliary Power Supply

3 Description
UCC24612 is a high performance synchronous
rectifier controller and driver for standard and logiclevel
N-channel MOSFET power devices. By
implementing a near-ideal diode emulation
UCC24612 reduces losses of the output rectifier and
indirectly the primary side losses. The drain to source
(VDS) sensing control scheme allows UCC24612 to
work with multiple topologies, such as Active Clamp
Flyback, QR/DCM/CCM Flyback and LLC, et.
Integrated features simplify the design effort, enabling
UCC24612 to excel in a variety of applications and
frequencies. The wide operating VDD and VD voltage
ranges enable simple implementation in systems with
outputs up to 28 V. Efficiency and noise immunity is
enhanced with adaptive minimum off-time. Variants
UCC24612-1 and UCC24612-2 offer different
minimum on-times to provide additional noise
immunity. Robust operation in continuous conduction
mode (CCM) is further enhanced with proportional
gate-drive and CCM cycle limit pre-turn-off.
UCC24612 has multiple features that improve
efficiency. The fast comparator with short propagation
delays reduces switching loss. The 9.5-V gate drive
clamp reduces MOSFET driving losses. Frequency
dependent standby modes further decreases standby
power. These features help UCC24612 be part of a
greater system that meets stringent efficiency
standards such as Department of Energy (DoE) Level
VI and Code of Conduct (CoC) Tier 2.
UCC24612 is available in a SOT23-5 package.