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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

UCC24612

SLUSCM5A – AUGUST 2017 – REVISED FEBRUARY 2018

UCC24612 High Frequency Synchronous Rectifier Controller

1

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 logic-

level

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.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

UCC24612

SOT23 (5)

3.00 mm × 3.00 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Flyback with High-Side SR

Flyback with Low-Side SR