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UC1853

UC2853

UC3853

The UC3853 provides simple, yet high performance active power factor

correction. Using the same control technique as the UC1854, this 8-pin de-

vice exploits a simplified architecture and an internal oscillator to minimize

external component count. The UC3853 incorporates a precision multi-

plier/squarer/divider circuit, voltage and current loop error amplifiers, and a

precision voltage reference to implement average current mode control

with RMS line voltage compensation. This control technique maintains con-

stant loop gain with changes in input voltage, which minimizes input line

current distortion over the worldwide input voltage range.

The internal 75kHz oscillator includes an external clock input, allowing syn-

chronization to downstream converters. Additionally, the device features an

overvoltage protection comparator, a clamped MOSFET gate driver which

self-biases low during undervoltage lockout, and low startup and supply

current.

These devices are available in 8-pin plastic and ceramic dual in-line (DIP)

packages, and 8-lead small outline (SOIC) packages. The UC1853 is

specified for operation from –55°C to +125°C, the UC2853 is specified for

operation from –25°C to +85°C, and the UC3853 is specified for operation

from 0°C to +70°C.

High Power Factor Preregulator

• Complete 8-pin Power Factor

Solution

• Reduced External Components

• RMS Line Voltage Compensation

• Precision Multiplier/Squarer/Divider

• Internal 75kHz Synchronizable

Oscillator

• Average Current Mode PWM

Control

• Overvoltage Protection Comparator

• High Current, Clamped Gate Driver

BLOCK DIAGRAM

11/97

FEATURES

DESCRIPTION

UDG-94120-1

Summary of content (10 pages)

PAGE 1
UC1853 UC2853 UC3853 High Power Factor Preregulator FEATURES • Complete 8-pin Power Factor Solution • Reduced External Components • RMS Line Voltage Compensation • Precision Multiplier/Squarer/Divider • Internal 75kHz Synchronizable Oscillator • Average Current Mode PWM Control • Overvoltage Protection Comparator • High Current, Clamped Gate Driver DESCRIPTION The UC3853 provides simple, yet high performance active power factor correction.
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UC1853 UC2853 UC3853 ABSOLUTE MAXIMUM RATINGS CONNECTION DIAGRAM Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Output Drive Current, Continuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.125A Peak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A Output Minimum Voltage . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V IAC Maximum Input Current . . . . . . . . . . . . . . . . . . . . . . . .
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UC1853 UC2853 UC3853 ELECTRICAL CHARACTERISTICS Unless otherwise stated, these parameters apply for TA = –55°C to +125°C for the UC1853; –25°C to +85°C for the 2853; and 0°C to +70°C for the UC3853; VCC = 16V, VFB = 3V, IAC = 100mA, VVCOMP = 3.75V, VICOMP = 3V, TA = TJ. (continued) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS –230 –200 –170 µA –2 –0.
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UC1853 UC2853 UC3853 PIN DESCRIPTIONS vents excessive MOSFET gate-to-source voltage so that the UC3853 can be operated with VCC and high as 40V. A series gate resistor of at least 5 ohms should be used to minimize clamp voltage overshoot. In addition, a Schottky diode such as a 1N5818 connected between OUT and GND may be necessary to prevent parasitic substrate diode conduction. FB: Voltage Amplifier Inverting Input, Overvoltage Comparator Input, Sync Input. This pin serves three functions.
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UC1853 UC2853 UC3853 UC3853 TYPICAL APPLICATION UDG-97127 Note: the application circuit shown is a 100W, 75KHz design. Additional application information can be found in Application Note U–159 and Design Note DN–78. UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 18-Sep-2008 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
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PACKAGE MATERIALS INFORMATION www.ti.com 29-Jul-2008 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel Diameter Width (mm) W1 (mm) A0 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant UC2853DTR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 UC3853DTR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 29-Jul-2008 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UC2853DTR SOIC D 8 2500 346.0 346.0 29.0 UC3853DTR SOIC D 8 2500 346.0 346.0 29.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.