UCC24636 Controller Datasheet

UCC24636 Datasheet PDF, Equivalent


Part Number

UCC24636

Description

Synchronous Rectifier Controller

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download UCC24636 Datasheet


UCC24636
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
Reference
Design
UCC24636
SLUSCG2A – MARCH 2016 – REVISED MARCH 2016
UCC24636 Synchronous Rectifier (SR) Controller
With Ultra-Low Standby Current
1 Features
1 Secondary-Side SR Controller Optimized for 5-V
to 24-V Output Discontinuous/Transition Mode
Only Flyback Converters
• Volt-Second Balance Control Enables Highest
Rectifier Efficiency
• Compatible with PSR and SSR Flyback
Controllers
• Ultra Low 110-µA Standby Current Consumption
• Auto-Detect Standby Mode Disables SR Switching
for Lower No-Load Power Consumption
• SR Turn-Off Independent of RDSON and Parasitic
Inductance
• Operating Frequency Up to 130 kHz
• Wide VDD Range from 3.6 V to 28 V
• Adaptive Gate Drive Clamp
• Open and Short Pin Fault Protection
2 Applications
• AC/DC Adapters For Smartphones and Tablets
• USB Chargers with Type-C Connectors
• Notebook and Ultrabook Adapters
• High Efficiency Flyback Converters in Industrial
SMPS
• High Efficiency Auxilliary Power In Server and
Desktop Applications
3 Description
The UCC24636 SR is a compact, 6-pin secondary-
side synchronous rectifier MOSFET controller and
driver for high efficiency Flyback converters operating
in Discontinuous (DCM) and Transition mode (TM).
Unlike traditional SR controllers which measure the
SR MOSFET drain voltage, UCC24636 implements a
volt-second balance control method to determine the
turn off transition of the SR MOSFET; hence, SR
conduction time is independent of the MOSFET
RDSON, parasitic inductance or ringing allowing
flexibility to designers in component slelction and
PCB layout. This control method enables maximum
SR conduction time and highest rectifier efficiency for
a given MOSFET.
The controller has built in intelligence to detect
converter no load operation and automatically enters
standby mode. While in standby mode, it disables the
SR MOSFET and lowers its bias supply current to
110uA to further reduce overall system standby
power consumption. The wide VDD operating range
for the controller allows direct bias from the converter
output for fixed or variable output voltage designs.
This eliminates the need for an auxilliary winding on
the main transformer, which simplifies the circuit
design and reduces the cost.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
UCC24636
SOT23 (6)
2.92 mm x 1.30 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
Gate-Drive Timing vs VDS Sensing SR Driver
CB1 CB2 NP
NS
COUT
VOUT
15 A
1-mŸ RDSON MOSFET Example
VAC
UCC28740
VDD
HV
DRV
VS
CS
FB
GND
RVPC1
RVPC2
6
VDD
1 VPC
VSC
2
RVSC1
UCC24636
RVSC2
4 DRV
TBLK 3
GND
5
RTBLK
TL431
Secondary
Current
VDS Sensing
Driver
5A
0.85 A
Gate Drive
300 ns
UCC24636
Gate Drive
5 Ps
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.

UCC24636
UCC24636
SLUSCG2A – MARCH 2016 – REVISED MARCH 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information .................................................. 4
7.5 Electrical Characteristics........................................... 5
7.6 Timing Requirements ............................................... 6
7.7 Typical Characteristics .............................................. 7
8 Detailed Description .............................................. 9
8.1 Overview ................................................................... 9
8.2 Functional Block Diagram ......................................... 9
8.3 Feature Description................................................. 10
8.4 Device Functional Modes........................................ 19
9 Application and Implementation ........................ 20
9.1 Application Information............................................ 20
9.2 Typical Application ................................................. 20
9.3 Do's and Don'ts ...................................................... 27
10 Power Supply Recommendations ..................... 27
11 Layout................................................................... 28
11.1 Layout Guidelines ................................................. 28
11.2 Layout Example .................................................... 29
12 Device and Documentation Support ................. 30
12.1 Device Support .................................................... 30
12.2 Documentation Support ........................................ 30
12.3 Trademarks ........................................................... 30
12.4 Electrostatic Discharge Caution ............................ 30
12.5 Glossary ................................................................ 30
13 Mechanical, Packaging, and Orderable
Information ........................................................... 30
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (December 2015) to Revision A
Page
• Changed device status from Product Preview to Production Data and released full data sheet........................................... 1
2 Submit Documentation Feedback
Product Folder Links: UCC24636
Copyright © 2016, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design UCC24636 S LUSCG2A – MARCH 2016 – REVISED MARC H 2016 UCC24636 Synchronous Rectifier ( SR) Controller With Ultra-Low Standby C urrent 1 Features •1 Secondary-Side SR Controller Optimized for 5-V to 24-V Output Discontinuous/Transition Mode O nly Flyback Converters • Volt-Second Balance Control Enables Highest Rectifi er Efficiency • Compatible with PSR a nd SSR Flyback Controllers • Ultra Lo w 110-µA Standby Current Consumption Auto-Detect Standby Mode Disables SR Switching for Lower No-Load Power Cons umption • SR Turn-Off Independent of RDSON and Parasitic Inductance • Oper ating Frequency Up to 130 kHz • Wide VDD Range from 3.6 V to 28 V • Adapti ve Gate Drive Clamp • Open and Short Pin Fault Protection 2 Applications • AC/DC Adapters For Smartphones and Tab lets • USB Chargers with Type-C Conne ctors • Notebook and Ultrabook Adapters • High Efficiency Flyback Converters in Industrial S.
Keywords UCC24636, datasheet, pdf, etcTI, Synchronous, Rectifier, Controller, CC24636, C24636, 24636, UCC2463, UCC246, UCC24, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)