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UCC28720 Datasheet Preview

UCC28720 Datasheet

Constant-Current Controller

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UCC28720
SLUSBE8B – MAY 2013 – REVISED SEPTEMBER 2015
UCC28720 Constant-Voltage, Constant-Current Controller With Primary-Side Regulation
1 Features
1 < 10-mW No-Load Power
• Primary-Side Regulation (PSR) Eliminates Opto-
Coupler
• ±5% Voltage and Current Regulation Across Line
and Load
• 700-V Start-Up Switch
• 80-kHz Maximum Switching Frequency Enables
High-Power Density Charger Designs
• Quasi-Resonant Valley-Switching Operation for
Highest Overall Efficiency
• Wide VDD Range Allows Small Bias Capacitor
• Dynamic BJT Drive
• Overvoltage, Low-Line, and Overcurrent
Protection Functions
• Programmable Cable Compensation
• SOIC-7 Package
2 Applications
• USB-Compliant Adapters and Chargers for
Consumer Electronics
– Smart phones
– Tablet computers
– Cameras
• Standby Supply for TV and Desktop
• White Goods
3 Description
The UCC28720 flyback power supply controller
provides isolated-output Constant-Voltage (CV) and
Constant-Current (CC) output regulation without the
use of an optical coupler. The devices process
information from the primary power switch and an
auxiliary flyback winding for precise control of output
voltage and current.
An internal 700-V start-up switch, dynamically-
controlled operating states and a tailored modulation
profile support ultra-low standby power without
sacrificing start-up time or output transient response.
Control algorithms in the UCC28720 allow operating
efficiencies to meet or exceed applicable standards.
The output drive interfaces to a bipolar transistor
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. Protection features
help keep primary and secondary component
stresses in check. The UCC28720 allows
compensation for voltage drop in the cable to be
programmed with an external resistor.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
UCC28720
SOIC (7)
3.91 mm × 4.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
+
VAC
VAUX
UCC28720
VDD HV
DRV
VS
CBC CS
GND
VOUT
UDG-13090
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.




etcTI

UCC28720 Datasheet Preview

UCC28720 Datasheet

Constant-Current Controller

No Preview Available !

UCC28720
SLUSBE8B – MAY 2013 – REVISED SEPTEMBER 2015
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....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 4
6.6 Switching Characteristics .......................................... 5
6.7 Typical Characteristics .............................................. 6
7 Detailed Description .............................................. 8
7.1 Overview ................................................................... 8
7.2 Functional Block Diagram ......................................... 8
7.3 Feature Description................................................... 9
7.4 Device Functional Modes........................................ 11
8 Application and Implementation ........................ 16
8.1 Application Information............................................ 16
8.2 Typical Application ................................................. 16
9 Power Supply Recommendations...................... 21
10 Layout................................................................... 22
10.1 Layout Guidelines ................................................. 22
10.2 Layout Example .................................................... 22
11 Device and Documentation Support ................. 24
11.1 Device Support .................................................... 24
11.2 Documentation Support ........................................ 25
11.3 Community Resources.......................................... 26
11.4 Trademarks ........................................................... 26
11.5 Electrostatic Discharge Caution ............................ 26
11.6 Glossary ................................................................ 26
12 Mechanical, Packaging, and Orderable
Information ........................................................... 27
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (January 2014) to Revision B
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section. ................................................................................................ 1
Changes from Original (May 2014) to Revision A
Page
• Changed CDD equation. ........................................................................................................................................................ 20
2 Submit Documentation Feedback
Product Folder Links: UCC28720
Copyright © 2013–2015, Texas Instruments Incorporated


Part Number UCC28720
Description Constant-Current Controller
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