Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - AC/DC converter, offline switcher Flyback Soft Start SOIC 8

VCC

DRV

GND

ZCD

VO_SNS

COMP

MULTIN

UCC28051

BULK

STATUS

OVP

VDD

OUT

GND

UCC28600

VDD

Primary Secondary

TL431

Feedback

OVP2

OVP1

18 V

UCC28600

www.ti.com

SLUS646J –NOVEMBER 2005– REVISED JULY 2011

8-Pin Quasi-Resonant Flyback Green-Mode Controller

Check for Samples: UCC28600

FEATURES

APPLICATIONS

• Green-Mode Controller With Advanced Energy

• Bias Supplies for LCD-Monitors, LCD-TV,

Saving Features PDP-TV, and Set Top Boxes

• Quasi-Resonant Mode Operation for Reduced • AC/DC Adapters and Offline Battery Chargers

EMI and Low Switching Losses (Low Voltage

• Energy Efficient Power Supplies up to 200 W

Switching)

• Low Standby Current for System No-Load

DESCRIPTION

Power Consumption

The UCC28600 is a PWM controller with advanced

• Low Startup Current: 25 μA Maximum

energy features to meet stringent world-wide energy

efficiency requirements.

• Programmable Overvoltage Protection, Line

and Load

UCC28600 integrates built-in advanced energy

• Internal Overtemperature Protection

saving features with high level protection features to

• Current Limit Protection

provide cost effective solutions for energy efficient

power supplies. UCC28600 incorporates frequency

– Cycle-by-Cycle Power Limit

fold back and green mode operation to reduce the

– Primary-Side Overcurrent Hiccup Restart

operation frequency at light load and no load

Mode

operations.

• 1-A Sink TrueDrive™, -0.75-A Source Gate

UCC28600 is offered in the 8-pin SOIC (D) package.

Drive Output

Operating junction temperature range is -40°C to

• Programmable Soft-Start

105°C.

• Green-Mode Status Pin (PFC Disable Function)

TYPICAL APPLICATION

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2TrueDrive is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (31 pages)

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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com DESCRIPTION (CONT.) The Design Calculator, (Texas Instruments Literature number SLVC104), located in the Tools and Software section of the UCC28600 product folder, provides a user-interactive iterative process for selecting recommended component values for an optimal design.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com ELECTRICAL CHARACTERISTICS VDD = 15 V, 0.1-μF capacitor from VDD to GND, 3.3-nF capacitor from SS to GND charged over 3.5 V, 500-Ω resistor from OVP to -0.1 V, FB = 4.8 V, STATUS = not connected, 1-nF capacitor from OUT to GND, CS = GND, TA = -40°C to 105°C, (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX 12 25 UNIT Overall ISTARTUP Startup current VDD = VUVLO -0.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) VDD = 15 V, 0.1-μF capacitor from VDD to GND, 3.3-nF capacitor from SS to GND charged over 3.5 V, 500-Ω resistor from OVP to -0.1 V, FB = 4.8 V, STATUS = not connected, 1-nF capacitor from OUT to GND, CS = GND, TA = -40°C to 105°C, (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Current Sense (CS) (2) Gain, FB = ΔVFB / ΔVCS QR mode Shutdown threshold VFB = 2.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com OPEN LOOP TEST CIRCUIT RCST + 5V 37.4 kΩ See Note CCST 560 pF See Note VFB UCC28600 1 SS STATUS 8 STATUS CSS 3.3 nF ROVP 500 Ω 2 FB OVP 7 3 CS VDD 6 4 GND OUT 5 IOVP CFB 47 pF VCS ICS IDD ROUT 10 Ω GND CDD 100 nF CBIAS 1 µF VOVP VDD VOUT COUT 1.0 nF NOTE RCST and CCST are not connected for maximum and minimum duty cycle tests, current sense tests and power limit tests.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com ORDERING INFORMATION TA PACKAGES -40°C to 105°C (1) SOIC (D) (1) PART NUMBER UCC28600D SOIC (D) package is available taped and reeled by adding “R” to the above part numbers. Reeled quantities for UCC28600DR is 2,500 devices per reel. DEVICE INFORMATION UCC28600 D PACKAGE (TOP VIEW) SS FB CS GND 1 8 2 7 3 6 4 5 STATUS OVP VDD OUT TERMINAL FUNCTIONS TERMINAL NAME CS NO. 3 I/O DESCRIPTION I Current sense input.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com TERMINAL COMPONENTS TERMINAL NAME NO.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com TERMINAL COMPONENTS (continued) TERMINAL NAME NO.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com TERMINAL COMPONENTS (continued) TERMINAL NAME NO.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com PFC OUTPUT or BRIDGE RECTIFIER PRIMARY + CBULK RSU RSNUB CSNUB N1 VBULK SECONDARY + N2 COUT - D2 RVDD CVDD PFC CONTROLLER BIAS (if used) QST VOUT ROUT - D1 NB CBIAS ROVP1 RST2 ICC RST1 UCC28600 1 SS STATUS 8 2 FB OVP 7 3 CS VDD 6 4 GND OUT 5 CSS FEEDBACK ROVP2 M1 TL431 CBP 100nF RPL RCS Figure 1.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com APPLICATION INFORMATION Functional Description The UCC28600 is a multi-mode controller, as illustrated in Figure 3 and Figure 4. The mode of operation depends upon line and load conditions. Under all modes of operation, the UCC28600 terminates the OUT = HI signal based on the switch current. Thus, the UCC28600 always operates in current mode control so that the power MOSFET current is always limited.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com START N RUN = Logic Low STATUS = Hi Z N VDD > 13V? Y Continuous Fault Monitor VDD < 8V? REF < 4V? OVP = Logic High? OT = Logic High? OC = Logic High Y RUN = Logic High STATUS = Hi Z Soft Start RUN = Logic Low Monitor V FB V FB < 1.4V 1.4V < V FB < 2.0V V FB > 2.0V Fixed V/s 40kHz STATUS = 0V (In Run-Mode) STATUS = 0V (In Run-Mode) V FB < 0.5V Fixed V/s Freq.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com SS Mode (Fixed fSW ) QR Mode (Valley Switching, VS) Switching Frequency fsw DCM (maximum fs) (VS) FFM, (VS) fMAX = Oscillator Frequency (130 kHz) Green Mode This mode applies bursts of 40kHz soft−start pulses to the power MOSFET gate. The average fsw is shown in this operating mode.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com Details of the functional boxes in the Block Diagram/Typical Application drawing are shown in Figure 5, Figure 6, Figure 7 and Figure 8. These figures conceptualize how the UCC28600 executes the command of the FB voltage to have the responses that are shown in Figure 2, Figure 3 and Figure 4. The details of the functional boxes also conceptualize the various fault detections and responses that are included in the UCC28600.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com CIN RSU NP CVDD Auxiliary Winding ROVP1 NS COUT NB ROVP2 VDD OVP 7 UCC28600 QR Detect 0.1 V + Slope RCS + QR_DONE (Oscillator) -0.1 V OUT (From Driver) 0.1 V + + + REF (5 V) ILINE REF (5 V) Power Limit Offset 3.75 V RPL1 ILINE ILINE 2 Burst (from FAULT logic) 1 LOAD_OVP (Fault Logic) + 1 kW LINE_OVP (Fault Logic) 0.45 V 0 CS CS 3 RPL2 Figure 7.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com UCC28600 Fault Logic REF UVLO REF_OK SET D Q Thermal Shutdown Q CLR OVR_T RUN LINE_OVP REF (5 V) (QR Detect) SS/DIS LOAD_OVP (QR Detect) Over−Current 20 kΩ Shutdown + 0.5 V/0.7 V FB 1.25 V + Burst S Q R Q Power−Up Reset BURST 8 STATUS 7 0.5 V/1.4 V FB + SS_OVR CS 3 CS Figure 8. Fault Logic Details Quasi-Resonant / DCM Control Quasi-resonant (QR) and DCM operation occur for feedback voltages VFB between 2.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com Fault Logic Advanced logic control coordinates the fault detections to provide proper power supply recovery. This provides the conditioning for the thermal protection. Line overvoltage protection (line OVP) and load OVP are implemented in this block. It prevents operation when the internal reference is below 4.5 V. If a fault is detected in the thermal shutdown, line OVP, load OVP, or REF, the UCC28600 undergoes a shutdown/retry cycle.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com Operating Mode Programming Boundaries of the operating modes are programmed by the flyback transformer and the four components RPL, RCS, ROVP1 and ROVP2; shown in the Block Diagram/Application drawing. The transformer characteristics that predominantly affect the modes are the magnetizing inductance of the primary and the magnitude of the output voltage, reflected to the primary.
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UCC28600 www.ti.com SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 Cycle-by-Cycle Power Limit The cycle terminates when the CS voltage plus the power limit offset exceeds 1.2 V. In order to have power limited over the full line voltage range of the QR Flyback converter, the CS pin voltage must have a component that is proportional to the primary current plus a component that is proportional to the line voltage due to predictable switching frequency variations due to line voltage.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com TYPICAL CHARACTERISTICS SWITCHING FREQUENCY vs TEMPERATURE 31 142 29 137 fS – Switching Frequency – kHz VDD – Clamp Voltage – V CLAMP VOLTAGE vs TEMPERATURE 27 25 23 21 –50 132 127 122 117 0 50 100 150 –50 0 TJ – Temperature – °C Figure 10. Figure 11.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com PRACTICAL DESIGN NOTES Non-Ideal Current Sense Value Resistors RCS, RPL, ROVP1 and ROVP2 must be programmed as a set due to functional interactions in the converter. Often, the ideal value for RCS is not available because the selection range of current sense resistors is too coarse to meet the required power limit tolerances.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com Snubber Damping Resonance between the leakage inductance and the MOSFET drain capacitance can cause false load-OVP faults, in spite of the typical 2-μs delay in load-OVP detection. The bias winding is sensitive to the overshoot and ringing because it is well coupled to the primary winding. A technique to eliminate the problem is to use an R2CD snubber instead of an RCD snubber, shown in Figure 15.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com Begin the design of the R2CD using the same procedure as designing an RCD snubber. Then, add the damping resistor, RSNUB2. The procedure is as follows: DV SNUB Pick + between 0.
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UCC28600 SLUS646J – NOVEMBER 2005 – REVISED JULY 2011 www.ti.com REFERENCES 1. Power Supply Seminar SEM-1400 Topic 2: Design And Application Guide For High Speed MOSFET Gate Drive Circuits, by Laszlo Balogh, Texas Instruments Literature Number SLUP133 2. Datasheet, UCC3581 Micro Power PWM Controller, Texas Instruments Literature Number SLUS295 3. Datasheet, UCC28051 Transition Mode PFC Controller, Texas Instruments Literature Number SLUS515 4. UCC28600 Design Calculator, A QR Flyback Designer.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device UCC28600DR Package Package Pins Type Drawing SOIC D 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.4 B0 (mm) K0 (mm) P1 (mm) 5.2 2.1 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UCC28600DR SOIC D 8 2500 340.5 338.1 20.
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