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CVDD

Primary Secondary

TL431

Feedback

ROVP2

ROVP1

18 V

CB

NP

NS

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M1

Product

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Sample &Buy

Technical

Documents

Tools &

Software

Support &Community

ReferenceDesign

UCC28600SLUS646K NOVEMBER 2005REVISED AUGUST 2015

UCC28600 8-Pin Quasi-Resonant Flyback Green-Mode Controller1 Features 3 Description

The UCC28600 is a PWM controller with advanced1 Green-Mode Controller With Advanced Energy

energy features to meet stringent world-wide energySaving Featuresefficiency requirements.

Quasi-Resonant Mode Operation for ReducedUCC28600 integrates built-in advanced energyEMI and Low Switching Losses (Low-Voltagesaving features with high-level protection features toValley Switching)provide cost-effective solutions for energy-efficient Low Standby Current for Minimum System No- power supplies. UCC28600 incorporates frequency

Load Power Consumption fold-back and green-mode operation to reduce the Low Start-up Current: 25-A Maximum switching losses at light-load and no-load conditions. Programmable Line and Load Over-Voltage UCC28600 is available in the 8-pin SOIC package.

Protection Operating junction temperature range is 40C to+105C. Internal Over-Temperature Protection

Current Limit Protection The UCC28600 Design Calculator, (SLVC104),located in the Tools and Software section of the Cycle-by-Cycle Power LimitUCC28600 product folder, provides a user-interactive Primary-Side Over-Current Hiccup Restart iterative process for selecting recommendedMode component values for an optimal design.

1-A Sink, 0.75-A Source TrueDrive Gate DriveOutput Device Information (1)

PART NUMBER PACKAGE BODY SIZE (NOM) Programmable Soft-StartUCC28600 SOIC (8) 4.90 mm 3.91 mm Green-Mode Status Pin (PFC Disable Function)(1) For all available packages, see the orderable addendum at

the end of the data sheet.2 Applications Bias Supplies for LCD-Monitors, LCD-TV, PDP-

TV, and Set Top Boxes AC-to-DC Adapters and Off-Line Battery Chargers Energy Efficient Power Supplies up to 200 W

Typical Application Diagram

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.

http://www.ti.com/product/UCC28600?dcmp=dsproject&hqs=pfhttp://www.ti.com/product/UCC28600?dcmp=dsproject&hqs=sandbuysamplebuyhttp://www.ti.com/product/UCC28600?dcmp=dsproject&hqs=tddoctype2http://www.ti.com/product/UCC28600?dcmp=dsproject&hqs=swdesKithttp://www.ti.com/product/UCC28600?dcmp=dsproject&hqs=supportcommunityhttp://www.ti.com/tool/pmp5315http://www.ti.com/product/ucc28600?qgpn=ucc28600http://www.ti.com/lit/zip/SLVC104

UCC28600SLUS646K NOVEMBER 2005REVISED AUGUST 2015 www.ti.com

Table of Contents7.4 Device Functional Modes........................................ 181 Features .................................................................. 1

8 Application and Implementation ........................ 212 Applications ........................................................... 18.1 Application Information............................................ 213 Description ............................................................. 18.2 Typical Application ................................................. 214 Revision History..................................................... 28.3 Do's and Don'ts ...................................................... 335 Pin Configuration and Functions ......................... 3

9 Power Supply Recommendations ...................... 346 Specifications......................................................... 410 Layout................................................................... 346.1 Absolute Maximum Ratings ...................................... 4

10.1 Layout Guidelines ................................................. 346.2 ESD Ratings ............................................................ 410.2 Layout Example .................................................... 356.3 Recommended Operating Conditions....................... 4

11 Device and Documentation Support ................. 366.4 Thermal Information .................................................. 411.1 Device Support .................................................... 366.5 Electrical Characteristics........................................... 511.2 Documentation Support ....................................... 366.6 Timing Requirements ................................................ 611.3 Trademarks ........................................................... 366.7 Typical Characteristics .............................................. 711.4 Electrostatic Discharge Caution............................ 367 Detailed Description .............................................. 811.5 Glossary ................................................................ 367.1 Overview ................................................................... 8

12 Mechanical, Packaging, and Orderable7.2 Functional Block Diagram ......................................... 8Information ........................................................... 377.3 Feature Description................................................. 11

4 Revision HistoryNOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision J (July 2011) to Revision K Page

Added Pin Configuration and Functions section, ESD table, Feature Description section, Device Functional Modes,Application and Implementation section, Power Supply Recommendations section, Layout section, Device andDocumentation Support section, and Mechanical, Packaging, and Orderable Information section. .................................... 1

Changed Functional Block diagram........................................................................................................................................ 8 Changed Control Flow Chart diagram.................................................................................................................................. 11 Changed QR Detect Details image. ..................................................................................................................................... 13 Changed Oscillator Details image. ....................................................................................................................................... 14 Changed Fault Logic Details image...................................................................................................................................... 16 Changed Mode Control with FB Pin Voltage image. ........................................................................................................... 18 Changed Operation Mode Switching Frequencies image. .................................................................................................. 19

Changes from Revision H (November 2005) to Revision I Page

Changed Equation 35 .......................................................................................................................................................... 29

2 Submit Documentation Feedback Copyright 20052015, Texas Instruments Incorporated

Product Folder Links: UCC28600

http://www.ti.com/product/ucc28600?qgpn=ucc28600http://www.ti.comhttp://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SLUS646K&partnum=UCC28600http://www.ti.com/product/ucc28600?qgpn=ucc28600

1234

8765

SSFBCS

GND

STATUSOVPVDDOUT

UCC28600www.ti.com SLUS646K NOVEMBER 2005REVISED AUGUST 2015

5 Pin Configuration and Functions

D Package8-Pin SOICTop View

Pin FunctionsPIN

I/O DESCRIPTIONNAME NO.

Current sense input. Also programs power limit, and used to control modulation and activateovercurrent protection. The CS voltage input originates across a current sense resistor andCS 3 I ground. Power limit is programmed with an effective series resistance between this pin andthe current sense resistor.Feedback input or control input from the optocoupler to the PWM comparator used to controlthe peak current in the power MOSFET. An internal 20-k resistor is between this pin andthe internal 5-V regulated voltage. Connect the collector of the photo-transistor of theFB 2 I feedback optocoupler directly to this pin; connect the emitter of the photo-transistor to GND.The voltage of this pin controls the mode of operation in one of the three modes: quasiresonant (QR), frequency foldback mode (FFM) and green mode (GM).Ground for internal circuitry. Connect a ceramic 0.1-F bypass capacitor between VDD andGND 4 GND, with the capacitor as close to these two pins as possible.1-A sink (TrueDrive ) and 0.75-A source gate drive output. This output drives the power

OUT 5 O MOSFET and switches between GND and the lower of VDD or the 13-V internal outputclamp.Over voltage protection (OVP) input senses line-OVP, load-OVP and the resonant trough for

OVP 7 I QR turn-on. Detect line, load and resonant conditions using the primary bias winding of thetransformer, adjust sensitivity with resistors connected to this pin.Soft-start programming pin. Program the soft-start rate with a capacitor to ground; the rate isdetermined by the capacitance and the interna