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FEATURES

APPLICATIONS

DESCRIPTION

UCC28C4x-EP

BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS

SGLS352B – DECEMBER 2006 – REVISED MAY 2007

• Low Operating Current of 2.3 mA at 52 kHz

• Controlled Baseline • Fast 35 ns Cycle-by-Cycle Overcurrent

Limiting

– One Assembly/Test Site, One Fabrication

Site • ± 1 A Peak Output Current

– Extended Temperature Performance of • Rail-to-Rail Output Swings With 25 ns Rise

–55 ° C to 125 ° C and 20 ns Fall Times

• Enhanced Diminishing Manufacturing Sources • ± 1% Initial Trimmed 2.5 V Error Amplifier

(DMS) Support Reference

• Enhanced Product-Change Notification • Trimmed Oscillator Discharge Current

• Qualification Pedigree

(1)

• New Undervoltage Lockout Versions

• Enhanced Replacements for UC2842A Family • MSOP-8 Package Minimizes Board Space

With Pin-to-Pin Compatibility

• 1 MHz Operation

• Switch Mode Power Supplies

• 50 µ A Standby Current, 100 µ A Maximum

• DC-to-DC Converters

(1) Component qualification in accordance with JEDEC and

industry standards to ensure reliable operation over an

• Board Mount Power Modules

extended temperature range. This includes, but is not limited

to, Highly Accelerated Stress Test (HAST) or biased 85/85,

temperature cycle, autoclave or unbiased HAST,

electromigration, bond intermetallic life, and mold compound

life. Such qualification testing should not be viewed as

justifying use of this component beyond specified

performance and environmental limits.

The UCC28C4x family are high performance current mode PWM controllers. They are enhanced BiCMOS

versions with pin-for-pin compatibility to the industry standard UC284xA family and UC284x family of PWM

controllers. In addition, lower startup voltage versions of 7 V are offered as UCC28C40 and UCC28C41.

Providing necessary features to control fixed frequency, peak current mode power supplies, this family offers

several performance advantages. These devices offer high frequency operation up to 1 MHz with low start up

and operating currents, thus minimizing start up loss and low operating power consumption for improved

efficiency. The devices also feature a fast current sense to output delay time of 35 ns, and a ± 1 A peak output

current capability with improved rise and fall times for driving large external MOSFETs directly.

The UCC28C4x family is offered in 8-pin package SOIC (D).

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 (22 pages)

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UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.
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UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.com SGLS352B – DECEMBER 2006 – REVISED MAY 2007 AVAILABLE OPTIONS TA MAXIMUM DUTY CYCLE 100% –55°C to 125°C 50% (1) (2) UVLO ON/OFF SOIC-8 SMALL OUTLINE (D) (1) 14.5 V/9 V UCC28C42MDREP (2) 8.4 V/7.6 V UCC28C43MDREP 7 V/6.6 V UCC28C40MDREP (2) 14.5 V/9 V UCC28C44MDREP (2) 8.4 V/7.6 V UCC28C45MDREP 7 V/6.6 V UCC28C41MDREP (2) D (SOIC-8) packages are available taped and reeled. Add R suffix to device type (e.g.
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UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.com SGLS352B – DECEMBER 2006 – REVISED MAY 2007 Absolute Maximum Ratings (1) (2) over operating free-air temperature range (unless otherwise noted) MIN Supply voltage MAX 20 V Max ICC 30 mA Output current, IOUT peak ±1 A 5 µJ Output energy, capacitive load Voltage rating UNIT VDD COMP, CS, FB –0.3 6.3 OUT –0.3 20 RT/CT –0.3 6.
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UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.com SGLS352B – DECEMBER 2006 – REVISED MAY 2007 Electrical Characteristics VDD = 15 V (1), RT = 10 kΩ, CT = 3.3 nF, CVDD = 0.1 µF and no load on the outputs, TA = TJ = –55°C to 125°C for the UCC28C4x PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 5 5.1 V 0.
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UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.com SGLS352B – DECEMBER 2006 – REVISED MAY 2007 Electrical Characteristics (continued) VDD = 15 V, RT = 10 kΩ, CT = 3.3 nF, CVDD = 0.1 µF and no load on the outputs, TA = TJ = –55°C to 125°C for the UCC28C4x PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Rise tIme TA = 25°C, CLOAD = 1 nF 25 50 ns Fall time TA = 25°C, CLOAD = 1 nF 20 40 ns 15.
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UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.com SGLS352B – DECEMBER 2006 – REVISED MAY 2007 VREF: 5-V reference. For stability, the reference should be bypassed with a 0.1 µF capacitor to ground using the minimal trace length possible.
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www.ti.com UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS SGLS352B – DECEMBER 2006 – REVISED MAY 2007 APPLICATION INFORMATION This device is a pin-for-pin replacement of the bipolar UC2842 family of controllers—the industry standard PWM controller for single-ended converters. Familiarity with this controller family is assumed. The UCC28C4x series is an enhanced replacement with pin-to-pin compatibility to the bipolar UC284x and UC284xA families.
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UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.com SGLS352B – DECEMBER 2006 – REVISED MAY 2007 APPLICATION INFORMATION (continued) Reduced Discharge Current Variation The original UC2842 oscillator did not have trimmed discharged current, and the parameter was not specified on the data sheet. Since many customers attempted to use the discharge current to set a crude dead-time limit, the UC2842A family was released with a trimmed discharge current specified at 25°C.
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UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.com SGLS352B – DECEMBER 2006 – REVISED MAY 2007 APPLICATION INFORMATION (continued) 8 VREF 4 RT / CT RT SYNCHRONIZATION CIRCUIT INPUT CT UCC28C42 PWM 24 UDG-01069 Figure 2. Oscillator Synchronization Circuit CLOCK INPUT PWM OUT UPPER THRESHOLD LOW HIGH LOW LOWER THRESHOLD ON . OFF . ON . VCT (ANALOG) OUTPUT A UPPER THRESHOLD VCT VSYNC (DIGITAL) LOWER THRESHOLD COMBINED UDG−01070 Figure 3.
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UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.com SGLS352B – DECEMBER 2006 – REVISED MAY 2007 APPLICATION INFORMATION (continued) D50 F1 12 V OUT T1 R10 C52 C3 C12 + AC INPUT 100 Vac - 240 Vac EMI FILTER REQUIRED C55 R56 BR1 L50 D2 R11 C1A D51 C18 5V OUT R12 RT1 C53 C54 D6 R55 C5 SEC COMMON R6 R50 UCC28C44 IC2 1 COMP REF R16 8 Q1 2 FB VCC 7 3 CS OUT 6 4 RT/CT GND 5 IC2 C50 C13 R50 R53 R52 C51 K IC3 A R R54 UDG-01071 Figure 4.
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C4 Submit Documentation Feedback 46.4k C5 0.1uF 7 6 5 4 3 2 AGnd Ref Rt FB SS SD OVS R12 200 ucc3961 U1 R2 2 1 C7 8 9 10 11 12 13 14 T2 4 3 R4 1.5k 300 R13 C8 1uF Q2 470pF C6 76.8k R5 R6 4.7 C10 2.7nF 0.1uF C9 R8 R10 1k 5.1k D1 R14 50k R15 20k 40% 0.33 R9 Q1 C22 4.7nF D3 20k R24 20k 402 R25 20k R26 R28 R19 20 4.7 680pF 100 3300pF C12 5.6nF C16 21.
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UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.com SGLS352B – DECEMBER 2006 – REVISED MAY 2007 APPLICATION INFORMATION (continued) OSCILLATOR DISCHARGE CURRENT vs TEMPERATURE OSCILLATOR FREQUENCY vs TIMING RESISTANCE AND CAPACITANCE 9.5 10 M IDISCH − Oscillator Discharge Current − mA CT = 220 pF CT = 470 pF f − Frequency − Hz 1M CT = 1 nF 100 k 10 k CT = 4.7 nF CT = 2.2 nF 9.0 8.5 8.0 7.5 7.0 1k 1k 10 k 100 k −50 −25 0 RT − Timing Resistance − W Figure 6.
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UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.com SGLS352B – DECEMBER 2006 – REVISED MAY 2007 APPLICATION INFORMATION (continued) REFERENCE VOLTAGE vs TEMPERATURE ERROR AMPLIFIER REFERENCE VOLTAGE vs TEMPERATURE 2.55 VEAREF − Error Amplifier Reference Voltage − V 5.05 VREF − Reference Voltage − V 5.04 5.03 5.02 5.01 5.00 4.99 4.98 4.97 4.96 4.95 −50 2.54 2.53 2.52 2.51 2.50 2.49 2.48 2.47 2.46 2.
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UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.com SGLS352B – DECEMBER 2006 – REVISED MAY 2007 APPLICATION INFORMATION (continued) UNDERVOLTAGE LOCKOUT vs TEMPERATURE (UCC28C45) UNDERVOLTAGE LOCKOUT vs TEMPERATURE (UCC28C44) 16 9.0 15 13 VUVLO − UVLO Voltage − V VUVLO − UVLO Voltage − V 14 UVLO ON 12 UVLO OFF 11 10 9 8.6 8.4 8.2 8.0 7.8 7.6 8 7.4 7 7.2 6 −50 UVLO ON 8.8 −25 0 25 50 75 100 UVLO OFF 7.0 −50 125 TJ − Temperature − °C −25 0 Figure 14.
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UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.com SGLS352B – DECEMBER 2006 – REVISED MAY 2007 APPLICATION INFORMATION (continued) SUPPLY CURRENT vs TEMPERATURE 40 3.0 OUTPUT RISE TIME AND FALL TIME vs TEMPERATURE 10% to 90% VDD = 12 V 2.9 Output Rise and Fall TIme − ns 35 IDD − Supply Current − mA 2.8 2.7 2.6 2.5 2.4 NO LOAD 2.3 2.2 tr (1 nF) 30 tf (1 nF) 25 20 15 2.1 2.0 −50 −25 0 25 50 75 100 10 −50 125 −25 0 25 TJ − Temperature − °C Figure 18.
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UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.com SGLS352B – DECEMBER 2006 – REVISED MAY 2007 APPLICATION INFORMATION (continued) MAXIMUM DUTY CYCLE vs TEMPERATURE 1.10 UCC28C41 UCC28C44 UCC28C45 VCS_th − Current Sense Threshold − V Output Rise and Fall TIme − ns 50 49 48 47 46 45 −50 CURRENT-SENSE THRESHOLD VOLTAGE vs TEMPERATURE 1.05 1.00 0.95 0.90 −25 0 25 50 75 100 −50 125 −25 0 25 Figure 22. Figure 23.
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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 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 UCC28C43MDREP SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 UCC28C45MDREP 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 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UCC28C43MDREP SOIC D 8 2500 367.0 367.0 35.0 UCC28C45MDREP SOIC D 8 2500 367.0 367.0 35.
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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.