UCC24612 Controller Datasheet

UCC24612 Datasheet PDF, Equivalent


Part Number

UCC24612

Description

High Frequency Synchronous Rectifier Controller

Manufacture

etcTI

Total Page 30 Pages
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UCC24612
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UCC24612
SLUSCM5A – AUGUST 2017 – REVISED FEBRUARY 2018
UCC24612 High Frequency Synchronous Rectifier Controller
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.
Flyback with High-Side SR
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 Low-Side SR
REG
VS
VDD
VG
VD
VD VG VS
Vout
REG
VDD
Copyright © 2017, Texas Instruments Incorporated
Copyright © 2017, Texas Instruments Incorporated
1
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
UCC24612
SLUSCM5A – AUGUST 2017 – REVISED FEBRUARY 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 3
6.1 Absolute Maximum Ratings ...................................... 3
6.2 ESD Ratings ............................................................ 4
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics........................................... 6
6.6 Timing Requirements ................................................ 7
6.7 Typical Characteristics .............................................. 8
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 11
7.4 Device Functional Modes........................................ 22
8 Application and Implementation ........................ 23
8.1 Application Information............................................ 23
8.2 Typical Application ................................................. 23
9 Power Supply Recommendations...................... 29
10 PCB Layout .......................................................... 31
10.1 Layout Guidelines ................................................. 31
10.2 Layout Example .................................................... 31
11 Device and Documentation Support ................. 32
11.1 Community Resources.......................................... 32
11.2 Trademarks ........................................................... 32
11.3 Electrostatic Discharge Caution ............................ 32
11.4 Glossary ................................................................ 32
12 Mechanical, Packaging, and Orderable
Information ........................................................... 32
4 Revision History
DATE
February 2018
ORDERABL
E PART
NUMBER
TURN ON PROPAGATION
DELAY
UCC24612-1
80 ns
UCC24612-2
170 ns
REVISION
A
NOTES
Initial release.
Table 1. Device Comparison
MINIMUM ON TIME
MAXIMUM SWITCHING
FREQUENCY
375 ns
1 MHz
540 ns
800 kHz
BEST SUITABLE
TOPOLOGIES
CCM/DCM/QR Flyback,
Active Clamp Flyback using
GaN MOSFET as primary-
side switch
LLC, Active Clamp Flyback
using Si MOSFET as
primary-side switch
2 Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity UCC24612 SLUSCM5A – AUGUST 20 17 – REVISED FEBRUARY 2018 UCC24612 H igh Frequency Synchronous Rectifier Con troller 1 Features •1 Supports Topol ogies such as Active Clamp Flyback, QR, DCM, CCM Flyback and LLC • MOSFET VD S Sensing up to 230 V • Operating Fre quency Up to 1 MHz – 1 MHz for UCC246 12-1 – 800 kHz for UCC24612-2 • Wid e VDD Range Allows for Direct Bias from 5-V to 28-V Output Systems • 4-A Sin k, 1-A Source Gate Driver with Proporti onal Gate Drive • Adaptive Minimum Of f-time for Increased Noise Immunity • Cycle Limit Pre-Turn-off Improves Effi ciency in CCM • High or Low-Side Conf igurable • Automatic Light-Load and S leep-Mode Management with 320-µA stand by current • 16-ns Typical Turnoff Pr opagation Delay • 9.5-V Gate Drive Cl amp for Reduced Driving Loss 2 Applicat ions • AC-to-DC Adapters • USB Type -C and Power Delivery AC Adapters • Server and Telecom Power Supply • AC-to-DC Auxiliary Power Sup.
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