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SLUS579 − OCTOBER, 2003

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FEATURES

Controls Boost Preregulator to Near-Unity

Power Factor

D World Wide Line Operation

D Over-Voltage Protection

D Accurate Power Limiting

D Average Current Mode Control

D Improved Noise Immunity

D Improved Feed-Forward Line Regulation

D Leading Edge Modulation

D 150-µA Typical Start-Up Current

D Low-Power BiCMOS Operation

D 10.8-V to 17-V Operation

D Programmable Output Voltage (Tracking

Boost Topology)

DESCRIPTION

The UCC2819A/UCC3819A provides all the

functions necessary for active power factor

corrected preregulators. The controller achieves

near unity power factor by shaping the ac-input

line current waveform to correspond to that of the

ac-input line voltage. Average current mode

control maintains stable, low distortion sinusoidal

line current.

Designed in Texas Instrument’s BiCMOS process,

the UCC3819A offers new features such as lower

start-up current, lower power dissipation,

overvoltage protection, a shunt UVLO detect

circuitry and a leading-edge modulation technique

to reduce ripple current in the bulk capacitor.

The UCC3819A allows the output voltage to be

programmed by bringing out the error amplifier

noninverting input.

BLOCK DIAGRAM

UDG-03124

VREF9

DRVOUT

GND

CAI

VCC

OVP/EN

VAOUT

1.9 V

PKLMT

7.5 V

REFERENCE

UVLO

VCC

OSCILLATOR

PWM

LATCH

−

PWM

CAOUT

−

VOLTAGE

ERROR AMP

8.0 V

11VSENSE

VFF

IAC

MOUT

MIRROR

2:1

−

ENABLE

OVP

MULT

OSC

CLK

CURRENT

AMP

−

0.33 V

ZERO POWER

−

13VAI

10.2 V/9.7 V

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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.

Summary of content (20 pages)

PAGE 1
SLUS579 − OCTOBER, 2003 FEATURES D Controls Boost Preregulator to Near-Unity D D D D D D D D D D D DESCRIPTION The UCC2819A/UCC3819A provides all the functions necessary for active power factor corrected preregulators. The controller achieves near unity power factor by shaping the ac-input line current waveform to correspond to that of the ac-input line voltage. Average current mode control maintains stable, low distortion sinusoidal line current.
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SLUS579 − OCTOBER, 2003 DESCRIPTION (CONTINUED) The UCC3819A is directly pin for pin compatible with the UCC3819. Only the output stage of UCC3819A has been modified to allow use of a smaller external gate drive resistor values. For some power supply designs where an adequately high enough gate drive resistor can not be used, the UCC3819A offers a more robust output stage at the cost of increasing the internal gate resistances. The gate drive of the UCC3819A remains strong at ±1.
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SLUS579 − OCTOBER, 2003 ABSOLUTE MAXIMUM RATINGS over operating free-air temperature (unless otherwise noted)† UCCx81xA UNIT Supply voltage VCC 18 V Gate drive current, continuous 0.2 Gate drive current 1.2 Input voltage, CAI, MOUT, SS A 8 Input voltage, PKLMT 5 Input voltage, VSENSE, OVP/EN, VAI 10 Input current, RT, IAC, PKLMT 10 Maximum negative voltage, DRVOUT, PKLMT, MOUT Power dissipation V −0.
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SLUS579 − OCTOBER, 2003 ELECTRICAL CHARACTERISTICS TA = 0°C to 70°C for the UCC3819A, −40°C to 85°C for the UCC2819A, VCC = 12 V, RT = 22 kΩ, CT = 270 pF, (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS VREF +0.48 VREF +0.50 VREF +0.52 V Hysteresis 300 500 600 Enable threshold 1.7 1.9 2.1 Enable hysteresis 0.1 0.2 0.
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SLUS579 − OCTOBER, 2003 ELECTRICAL CHARACTERISTICS TA = 0°C to 70°C for the UCC3819A, −40°C to 85°C for the UCC2819A, VCC = 12 V, RT = 22 kΩ, CT = 270 pF, (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX −6 −20 UNITS Multiplier IMOUT, high line, low power output current, (0°C to 85°C) IAC = 500 µA, VFF = 4.7 V, VAOUT = 1.25 V 0 IMOUT, high line, low power output current, (−40°C to 85°C) IAC = 500 µA, VFF = 4.7 V, VAOUT = 1.
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SLUS579 − OCTOBER, 2003 PIN ASSIGNMENTS TERMINAL NAME I/O NO.
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SLUS579 − OCTOBER, 2003 Pin Descriptions (continued) IAC: This input to the analog multiplier is a current proportional to instantaneous line voltage. The multiplier is tailored for very low distortion from this current input (IIAC) to multiplier output. The recommended maximum IIAC is 500 µA. MOUT: The output of the analog multiplier and the inverting input of the current amplifier are connected together at MOUT.
PAGE 8
SLUS579 − OCTOBER, 2003 APPLICATION INFORMATION The UCC3819A is based on the UCC3818 PFC preregulator. For a more detailed application information for this part, please refer to the UCC3818 datasheet product folder. The main difference between the UCC3818 and the UCC3819A is that the non-inverting input of the voltage error amplifier is made available to the user through an external pin (VAI) in the UCC3819A. The SS pin and function were eliminated to accommodate this change.
PAGE 9
SLUS579 − OCTOBER, 2003 APPLICATION INFORMATION REFERENCE VOLTAGE vs REFERENCE CURRENT REFERENCE VOLTAGE vs SUPPLY VOLTAGE 7.510 VREF − Reference Voltage − V VREF − Reference Voltage − V 7.60 7.55 7.50 7.505 7.500 7.45 7.495 7.40 7.490 9 10 11 12 13 0 14 5 Figure 2 15 20 25 Figure 3 MULTIPLIER OUTPUT CURRENT vs VOLTAGE ERROR AMPLIFIER OUTPUT MULTIPLIER GAIN vs VOLTAGE ERROR AMPLIFIER OUTPUT 1.5 350 300 1.3 IAC = 150 µ A IAC = 150 µ A 250 1.
PAGE 10
SLUS579 − OCTOBER, 2003 APPLICATION INFORMATION MULTIPLIER CONSTANT POWER PERFORMANCE (VFF × IMOUT) − µW 500 400 VAOUT = 5 V 300 VAOUT = 4 V 200 VAOUT = 3 V 100 VAOUT = 2 V 0 0.0 1.0 2.0 3.0 4.0 VFF − Feedforward Voltage − V 5.
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PACKAGE OPTION ADDENDUM www.ti.
PAGE 12
PACKAGE OPTION ADDENDUM www.ti.com 21-Mar-2013 (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined.
PAGE 13
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 10.3 2.1 8.0 16.0 Q1 UCC2819ADR SOIC D 16 2500 330.0 16.4 6.5 UCC2819APWR TSSOP PW 16 2000 330.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1 UCC3819ADR SOIC D 16 2500 330.0 16.4 6.5 10.3 2.1 8.0 16.
PAGE 14
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UCC2819ADR SOIC D 16 2500 333.2 345.9 28.6 UCC2819APWR TSSOP PW 16 2000 367.0 367.0 35.0 UCC3819ADR SOIC D 16 2500 333.2 345.9 28.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.