Datasheet

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FEATURES

SUPPORTS DEFENSE, AEROSPACE,

D, DW, N, or PW PACKAGE

(TOP VIEW)

GND

PKLMT

CAOUT

CAI

MOUT

IAC

VAOUT

VFF

DRVOUT

VCC

VSENSE

OVP/EN

VREF

DESCRIPTION/ORDERING INFORMATION

UCC2817-EP

UCC2818-EP

www.ti.com

........................................................................................................................................................................................... SLUS716 – DECEMBER 2008

BiCMOS POWER-FACTOR PREREGULATOR

• Controls Boost Preregulator to Near-Unity

Power Factor AND MEDICAL APPLICATIONS

• Controlled Baseline

• Limits Line Distortion

• One Assembly/Test Site

• World-Wide Line Operation

• One Fabrication Site

• Overvoltage Protection

• Available in Military ( – 55 ° C/125 ° C)

• Accurate Power Limiting

Temperature Range

(1)

• Average Current Mode Control

• Extended Product Life Cycle

• Improved Noise Immunity

• Extended Product-Change Notification

• Improved Feed-Forward Line Regulation

• Product Traceability

• Leading Edge Modulation

• 150- µ A Typical Start-Up Current

• Low-Power BiCMOS Operation

• 12-V to 17-V Operation

(1) Additional temperature ranges are available - contact factory

The UCC2817 and UCC2818 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 with TI ' s BiCMOS process, the UCC2817 and UCC2818 offers new features, such as lower start-up

current, lower power dissipation, overvoltage protection, a shunt UVLO detect circuitry, a leading-edge

modulation technique to reduce ripple current in the bulk capacitor, and an improved, low-offset ( ± 2-mV) current

amplifier to reduce distortion at light load conditions.

The UCC2817 offers an on-chip shunt regulator with low start-up current suitable for applications utilizing a

bootstrap supply. The UCC2818 is intended for applications with a fixed supply (V

The devices are available in a 16-pin D package.

ORDERING INFORMATION

= T

PACKAGE

(1)

ORDERABLE PART NUMBER TURN-ON THRESHOLD

– 55 ° C to 125 ° C SOIC – D Reel UCC2818MDREP 10.2 V

(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

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.

2 Unitrode 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 (23 pages)

PAGE 1
UCC2817-EP UCC2818-EP www.ti.com ...........................................................................................................................................................................................
PAGE 2
UCC2817-EP UCC2818-EP SLUS716 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com BLOCK DIAGRAM VCC 15 OVP/EN 10 7.5-V Reference 16 V (For UCC2817 Only) SS VSENSE − 16 DRVOUT 1 GND 2 PKLMT UVLO ENABLE + 7 11 − 7.5 V VFF VREF 13 1.9 V VAOUT 9 0.
PAGE 3
UCC2817-EP UCC2818-EP www.ti.com ........................................................................................................................................................................................... SLUS716 – DECEMBER 2008 Pin Descriptions CAI: Current amplifier noninverting input. Place a resistor between this pin and the GND side of current sense resistor. This input and the inverting input (MOUT) remain functional down to and below GND. CAOUT: Current amplifier output.
PAGE 4
UCC2817-EP UCC2818-EP SLUS716 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com VCC: Positive supply voltage. Connect to a stable source of at least 20 mA between 10 V and 17 V for normal operation. Bypass VCC directly to GND to absorb supply current spikes required to charge external MOSFET gate capacitances.
PAGE 5
UCC2817-EP UCC2818-EP www.ti.com ........................................................................................................................................................................................... SLUS716 – DECEMBER 2008 ELECTRICAL CHARACTERISTICS TA = –55°C to 125°C, TA = TJ, VCC = 12 V, RT = 22 kΩ, CT = 270 pF (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Supply Current Supply current, off VCC = (VCC turn-on threshold – 0.
PAGE 6
UCC2817-EP UCC2818-EP SLUS716 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com ELECTRICAL CHARACTERISTICS (continued) TA = –55°C to 125°C, TA = TJ, VCC = 12 V, RT = 22 kΩ, CT = 270 pF (unless otherwise noted) PARAMETER TEST CONDITIONS Ramp amplitude voltage (peak to peak) MIN TYP MAX UNIT 3.5 4 4.
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UCC2817-EP UCC2818-EP www.ti.com ........................................................................................................................................................................................... SLUS716 – DECEMBER 2008 APPLICATION INFORMATION The UCC2817 is a BiCMOS average current mode boost controller for high-power-factor, high-efficiency, preregulator power supplies. Figure 1 shows the UCC2817 in a 250-W PFC preregulator circuit.
PAGE 8
UCC2817-EP UCC2818-EP SLUS716 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.
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UCC2817-EP UCC2818-EP www.ti.com ...........................................................................................................................................................................................
PAGE 10
UCC2817-EP UCC2818-EP SLUS716 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com Where: K = Constant typically equal to 1/V The Electrical Characteristics table covers all the required operating conditions for designing with the multiplier.
PAGE 11
UCC2817-EP UCC2818-EP www.ti.com ........................................................................................................................................................................................... SLUS716 – DECEMBER 2008 IMOUT(max) for this design is approximately 315 µA. The RMOUT resistor can then be determined by: V R MOUT + I RSENSE MOUT(max) In this example, VRSENSE was selected to give a dynamic operating range of 1.25 V, which gives an RMOUT of roughly 3.91 kΩ.
PAGE 12
UCC2817-EP UCC2818-EP SLUS716 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com In this example, Cf = 150 nF. Resistor Rf sets the dc gain of the error amplifier and, thus, determines the frequency of the pole of the error amplifier.
PAGE 13
UCC2817-EP UCC2818-EP www.ti.com ........................................................................................................................................................................................... SLUS716 – DECEMBER 2008 C C Rf R P Z I − CAOUT + Figure 3. Current Loop Compensation The UCC2817 current amplifier has the input from the multiplier applied to the inverting input.
PAGE 14
UCC2817-EP UCC2818-EP SLUS716 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com V 0.
PAGE 15
UCC2817-EP UCC2818-EP www.ti.com ........................................................................................................................................................................................... SLUS716 – DECEMBER 2008 UDG-97131 Figure 6. Timing Waveforms for Synchronization Scheme Table 1. Effects of Synchronization on Boost Capacitor Current VIN = 85 V VIN = 120 V VIN = 240 V D(Q2) Q1/Q2 D1/Q2 Q1/Q2 D1/Q2 Q1/Q2 D1/Q2 0.35 1.491 A 0.835 A 1.341 A 0.663 A 1.
PAGE 16
UCC2817-EP UCC2818-EP SLUS716 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com REFERENCE VOLTAGE vs SUPPLY VOLTAGE REFERENCE VOLTAGE vs REFERENCE CURRENT 7.510 VREF − Reference Voltage − V VREF − Reference Voltage − V 7.60 7.55 7.50 7.45 7.505 7.500 7.495 7.490 7.40 9 10 11 12 13 14 0 15 20 25 Figure 8. Figure 9.
PAGE 17
UCC2817-EP UCC2818-EP www.ti.com ........................................................................................................................................................................................... SLUS716 – DECEMBER 2008 RECOMMENDED MINIMUM GATE RESISTANCE vs SUPPLY VOLTAGE MULTIPLIER CONSTANT POWER PERFORMANCE (VFF × IMOUT) − µW 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 VFF − Feed-Forward Voltage − V 4.0 5.
PAGE 18
PACKAGE OPTION ADDENDUM www.ti.com 7-Aug-2009 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty UCC2818MDREP ACTIVE SOIC D 16 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM V62/09617-01XE ACTIVE SOIC D 16 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Lead/Ball Finish MSL Peak Temp (3) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs.
PAGE 19
PACKAGE MATERIALS INFORMATION www.ti.com 15-Dec-2008 TAPE AND REEL INFORMATION *All dimensions are nominal Device UCC2818MDREP Package Package Pins Type Drawing SOIC D 16 SPQ Reel Reel Diameter Width (mm) W1 (mm) 2500 330.0 16.4 Pack Materials-Page 1 A0 (mm) B0 (mm) K0 (mm) P1 (mm) 6.5 10.3 2.1 8.0 W Pin1 (mm) Quadrant 16.
PAGE 20
PACKAGE MATERIALS INFORMATION www.ti.com 15-Dec-2008 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UCC2818MDREP 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 JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.