Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - PFC 250 µA SOIC 16

FEATURES

DESCRIPTION

BLOCK DIAGRAM

ENA

VSENSE

IAC

VRMS

VCC

GND

GTDRV

2.65 V / 2.15 V

3 V

VAO

(A) 16 V / 10 V

(B) 10.5 V / 10 V

MOUT

ISENSE

CAO

OSC

RSET

S Q

PKLMT

20 V

POWER

7.5 V REF

REF

RUN

7.1 V

RUN

14 µA

MOUT

A B

UC1854A

UC2854A, UC2854B

UC3854A, UC3854B

SLUS329E – MONTH 2003 – REVISED JANUARY 2008

www.ti.com

ADVANCED HIGH-POWER FACTOR PREREGULATOR

• Controls Boost PWM to Near-Unity Power

Factor

The UC3854A/B products are pin compatible

enhanced versions of the UC3854. Like the UC3854,

• Limits Line Current Distortion To <3%

these products provide all of the functions necessary

• World-Wide Operation Without Switches

for active power factor corrected preregulators. The

• Accurate Power Limiting

controller achieves near unity power factor by

• Fixed-Frequency Average Current-Mode shaping the ac input line current waveform to

correspond to the ac input line voltage. To do this the

Control

UC3854A/B uses average current mode control.

• High Bandwidth (5 MHz), Low-Offset Current

Average current mode control maintains stable, low

Amplifier

distortion sinusoidal line current without the need for

• Integrated Current- and Voltage-Amplifier

slope compensation, unlike peak current mode

Output Clamps

control.

• Multiplier Improvements: Linearity, 500 mV V

A 1%, 7.5-V reference, fixed frequency oscillator,

Offset (Eliminates External Resistor), 0 V to

PWM, voltage amplifierwith soft-start, line voltage

5 V Multout Common-Mode Range

feedforward (V

RMS

squarer), input supply voltage

clamp, and over current comparator round out the lilst

• V

REF

GOOD Comparator

of feataures.

• Faster and Improved Accuracy ENABLE

Comparator Available in the 16-pin N (PDIP), DW (SOIC Wide),

and J (CDIP) and 20-pin Q (PLCC) package. See

• UVLO Options (16 V/10 V or 10.5 V/10 V)

Ordering Information table for availability by

• 300- µ A Start-Up Supply Current

temperature range.

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.

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 (18 pages)

PAGE 1
UC1854A UC2854A, UC2854B UC3854A, UC3854B www.ti.
PAGE 2
UC1854A UC2854A, UC2854B UC3854A, UC3854B www.ti.com SLUS329E – MONTH 2003 – REVISED JANUARY 2008 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
PAGE 3
UC1854A UC2854A, UC2854B UC3854A, UC3854B www.ti.
PAGE 4
UC1854A UC2854A, UC2854B UC3854A, UC3854B www.ti.com SLUS329E – MONTH 2003 – REVISED JANUARY 2008 ELECTRICAL CHARACTERISTICS VCC = 18 V, RT = 8.2 kΩ, CT = 1.5 nF, VPKLMT = 1 V, VVRMS = 1.5 V, IIAC = 100 µA, IISENSE = 0 V, VCAO = 3.5 V, VVAO = 5 V, VVSENSE = 3 V, –40°C < TA < 85°C for the UC2854A and UC2854B, and 0°C < TA < 70°C for the UC3854A and UC3854B, and TA = TJ (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 250 400 µA mA OVERALL CAO = 0 V, VCC = VUVLO–0.
PAGE 5
UC1854A UC2854A, UC2854B UC3854A, UC3854B www.ti.com SLUS329E – MONTH 2003 – REVISED JANUARY 2008 ELECTRICAL CHARACTERISTICS (Continued) VCC = 18 V, RT = 8.2 kΩ, CT = 1.5 nF, VPKLMT = 1 V, VVRMS = 1.5 V, IIAC = 100 µA, IISENSE = 0 V, VCAO = 3.
PAGE 6
UC1854A UC2854A, UC2854B UC3854A, UC3854B www.ti.
PAGE 7
UC1854A UC2854A, UC2854B UC3854A, UC3854B www.ti.com SLUS329E – MONTH 2003 – REVISED JANUARY 2008 TERMINAL FUNCTIONS TERMINAL NAME PACKAGES I/O DESCRIPTION J/N/DW Q/L CAO 3 4 O Output of the wide bandwidth current amplifier and one of the inputs to the PWM duty-cycle comparator. The output signal generated by this amplifier commands the PWM to force the correct input current. The output can swing from 0.1 V to 7.5 V. CT 14 18 I Capacitor from CT to GND sets the PWM oscillator frequency.
PAGE 8
UC1854A UC2854A, UC2854B UC3854A, UC3854B www.ti.com SLUS329E – MONTH 2003 – REVISED JANUARY 2008 FUNCTIONAL DESCRIPTION The UC3854A and UC3854B family of products are designed as pin compatible upgrades to the industry standard UC3854 active power factor correction circuits. The circuit enhancements allow the user to eliminate in most cases several external components currently required to successfully apply the UC3854.
PAGE 9
UC1854A UC2854A, UC2854B UC3854A, UC3854B www.ti.com SLUS329E – MONTH 2003 – REVISED JANUARY 2008 Voltage Amplifier The UC3854A/B voltage amplifier design is essentially similar to the UC3854 with two exceptions. The first is with the internal connection. The lower voltage reduces the amount of charge on the compensation capacitors, which provides improved recovery form large signal events, such as line dropouts, or power interruption. It also minimizes the dc current flowing through the feedback.
PAGE 10
UC1854A UC2854A, UC2854B UC3854A, UC3854B www.ti.com SLUS329E – MONTH 2003 – REVISED JANUARY 2008 TYPICAL CHARACTERISTICS GATE DRIVE TIMING vs LOAD CAPACITANCE 800 GATE DRIVE MAXIMUM DUTY CYCLE vs OSCILLATOR CHARGING RESISTANCE 100 700 95 Fall Time Duty Cycle − % t− Time − ns 600 500 400 Rise Time 300 90 85 80 200 75 100 0 0 0.01 0.02 0.03 0.04 70 1000 0.05 CLOAD − Load Capacitance − µF Figure 1. Figure 2. MULTIPLIER GAIN CONSTANT vs SUPPLY CURRENT 1.
PAGE 11
UC1854A UC2854A, UC2854B UC3854A, UC3854B www.ti.com SLUS329E – MONTH 2003 – REVISED JANUARY 2008 TYPICAL CHARACTERISTICS (continued) 120 PHASE 120 −90 80 −45 60 −0 40 20 Phase − ° 100 0 120 PHASE 100 Gain − dB Gain − dB VOLTAGE AMPLIFIER GAIN vs FREQUENCY 100 80 80 60 60 40 40 20 20 0 0 Phase − ° 140 CURRENT AMPLIFIER GAIN vs FREQUENCY −20 GAIN fCO = 5.
PAGE 12
PACKAGE OPTION ADDENDUM www.ti.
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.com 25-Sep-2013 NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (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.
PAGE 15
PACKAGE OPTION ADDENDUM www.ti.
PAGE 16
PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device UC3854ADWTR Package Package Pins Type Drawing SOIC DW 16 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2000 330.0 16.4 Pack Materials-Page 1 10.75 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 10.7 2.7 12.0 16.
PAGE 17
PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UC3854ADWTR SOIC DW 16 2000 367.0 367.0 38.
PAGE 18
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