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UCC28742 Datasheet

High-Efficiency Flyback Controller

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UCC28742
SLUSD71A – APRIL 2018 – REVISED MAY 2018
UCC28742 High-Efficiency Flyback Controller with Optocoupler Feedback
1 Features
1 Opto-Coupled Feedback Enables up to 1%
Regulation
• Accurate Current Limit with Overload Timeout
Protection and Delayed Hiccup Response
• Resonant-Ring Valley-Switching Operation for
Highest Overall Efficiency
• 80-kHz Maximum Switching Frequency
• Frequency Dithering to Ease EMI Compliance
• Clamped Gate-Drive Output for MOSFET
• Ultra-Low Start-Up Current and Large VDD
Hysteresis
– High Value Start-Up Resistor
– Low Bias Capacitance
• Fault Protections
– Input Low Line
– Output Over-Voltage
– Over-Current
– Short-Circuit
• SOT23-6 Package
• Create a Custom Design Using the UCC28742
with the WEBENCH® Power Designer
2 Applications
• Industrial and Medical AC-to-DC Power Supplies
• Smart Electricity Meters
• Bias Supply for UPS, Server PSU, etc.
• Power Supply for Cable Modem, Television, Set-
Top Box, and Wireless Routers
• AC-to-DC Power Supply for Appliances
Simplified Schematic
VBULK
+ VF -
VOUT
CB1
CB2
NP NS
COUT
VAC
RSTR
VAUX
+ VFA -
NA
RS1
RS2
VVDD
CVDD
VDD
UCC28742
SOT23-6
VE
VS
DRV
CFB3
RFB3
CS
IFB
RFB4
FB
GND
RLC
RCS
RTL
IOPT
ROPT
RFB1
ZFB
RFB2
3 Description
The UCC28742 off-line flyback controller is a highly
integrated, 6-pin secondary-side regulated PWM
controller for efficient AC-to-DC power supplies. It is
an isolated-flyback power-supply controller that
provides Constant-Voltage (CV) using an optical
coupler to improve transient response to large-load
steps. This device processes information from opto-
coupled feedback and an auxiliary flyback winding for
high-performance control of output voltage and
current.
The UCC28742 employs advanced control algorithms
to achieve high operating efficiency and performance.
The drive output interfaces to a MOSFET power
switch. Discontinuous conduction mode (DCM) with
valley-switching reduces switching losses. Modulation
of switching frequency and primary current-peak
amplitude (FM and AM) keeps the conversion
efficiency high across the entire load and line ranges.
The controller has a maximum switching frequency of
80 kHz and always maintains control of the peak-
primary current in the transformer. A minimum
switching frequency of 200 Hz facilitates the
achievement of low no-load input power.
Device Information (1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
UCC28742
SOT23-6
2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Efficiency of a 10-W, 5-V AC-to-DC
Converter
85%
82.5%
80%
77.5%
75%
72.5%
70%
67.5%
65%
62.5%
60%
10%
20%
30%
40% 50% 60% 70%
Output Power
115 V RMS
230 V RMS
80% 90% 100%
D001
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.




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UCC28742 Datasheet Preview

UCC28742 Datasheet

High-Efficiency Flyback Controller

No Preview Available !

UCC28742
SLUSD71A – APRIL 2018 – REVISED MAY 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......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings ............................................................ 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 7
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 21
8 Applications and Implementation ...................... 22
8.1 Application Information............................................ 22
8.2 Typical Application .................................................. 22
8.3 Do's and Don'ts ....................................................... 31
9 Power Supply Recommendations...................... 32
10 Layout................................................................... 32
10.1 Layout Guidelines ................................................. 32
10.2 Layout Example .................................................... 33
11 Device and Documentation Support ................. 34
11.1 Device Support .................................................... 34
11.2 Documentation Support ....................................... 37
11.3 Receiving Notification of Documentation Updates 38
11.4 Community Resources.......................................... 38
11.5 Trademarks ........................................................... 38
11.6 Electrostatic Discharge Caution ............................ 38
11.7 Glossary ................................................................ 38
12 Mechanical, Packaging, and Orderable
Information ........................................................... 38
4 Revision History
DATE
May 2018
REVISION
A
NOTES
Initial release.
2 Submit Documentation Feedback
Product Folder Links: UCC28742
Copyright © 2018, Texas Instruments Incorporated


Part Number UCC28742
Description High-Efficiency Flyback Controller
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