UCC28C45MDREP

UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS www.ti.com FEATURES • • • • • • • (1) Controlled Baseline – One Assembly/Test Site, One Fabrication Site – Extended Temperature Performance of –55°C to 125°C Enhanced Diminishing Manufacturing Sources (DMS) Support Enhanced Product-Change Notification Qualification Pedigree (1) Enhanced Replacements for UC2842A Family With Pin-to-Pin Compatibility 1 MHz Operation 50 µA Standby Current, 100 µA Maximum Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an 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. SGLS352B – DECEMBER 2006 – REVISED MAY 2007 • • • • • • • • Low Operating Current of 2.3 mA at 52 kHz Fast 35 ns Cycle-by-Cycle Overcurrent Limiting ±1 A Peak Output Current Rail-to-Rail Output Swings With 25 ns Rise and 20 ns Fall Times ±1% Initial Trimmed 2.5 V Error Amplifier Reference Trimmed Oscillator Discharge Current New Undervoltage Lockout Versions MSOP-8 Package Minimizes Board Space APPLICATIONS • • • Switch Mode Power Supplies DC-to-DC Converters Board Mount Power Modules DESCRIPTION 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. Copyright © 2006–2007, Texas Instruments Incorporated 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., UCC28C42DREP) to order quantities of 2500 devices per reel. Tube quantities are 75 for D packages (SOIC-8). Product Preview FUNCTIONAL BLOCK DIAGRAM Note: Toggle flip-flop used only in UCC28C41, UCC28C44, and UCC28C45. 2 Submit Documentation Feedback 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 6.3 VREF V 7 10 mA TJ Error amplifier output sink current Operating junction temperature range (3) –55 150 °C Tstg Storage temperature range –65 150 °C 300 °C Lead temperature (soldering, 10 s) (1) (2) (3) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltages are with respect to ground. Currents are positive into and negative out of the specified terminals. Long-term high temperature storage and/or extended use at maximum recommended operating conditions may result in a reduction of overall device life. See http://www.ti.com/ep_quality for additional information about enhanced plastic packaging. Dissipation Ratings PACKAGE D θja TA < 25°C DERATING FACTOR TA = 70°C TA = 85°C TA = 125°C (°C/W) POWER RATING ABOVE TA = 25°C POWER RATING POWER RATING POWER RATING 176 710 mW 5.68 mW/°C 454 mW 369 mW 142 mW Recommended Operating Conditions MIN MAX UNIT VDD Input voltage 18 V VOUT Output voltage range 18 V IOUT (1) Average output current 200 mA IOUT(ref) (1) Reference output current –20 mA TJ (1) Operating junction temperature 150 °C (1) –55 It is not recommended that the device operate under conditions beyond those specified in this table for extended periods of time. Submit Documentation Feedback 3 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 0.2 20 mV Reference Output voltage, initial accuracy TA = 25°C , IOUT = 1 mA Line regulation VDD = 12 V to 18 V Load regulation 1 mA to 20 mA Temperature stability (2) Total output variation (2) 4.9 3 25 mV 0.2 0.4 mV/°C 5.18 V 4.82 Output noise voltage 10 Hz to 10 kHz, TA = 25°C Long term stability 1000 hours, TA = 125°C (2) µV 50 5 25 mV –30 –45 –55 mA TA = 25°C (3) 50.5 53 55 kHz TA = Full Range (3) 50.5 57 KHz Output short circuit Oscillator Initial accuracy Voltage stability VDD = 12 V to 18 V (2) Temperature stability TMIN to TMAX Amplitude RT/CT pin peak to peak Discharge current 0.2 2.85 % 1 2.5 % 1.9 V TA = 25°C, RT/CT = 2 V (4) 7.7 8.4 9 mA RT/CT = 2 V (4) 7.2 8.4 9.5 mA 2.475 2.500 2.525 2.45 2.50 2.55 V –0.1 –2 µA Error Amplifier Feedback input voltage, initial accuracy VCOMP = 2.5 V, TA = 25°C Feedback input voltage, total variation VCOMP = 2.5 V Input bias current AVOL Open-loop voltage gain VOUT = 2 V to 4 V 65 90 dB 1.5 MHz 2 14 mA –0.5 –1 mA 5 6.8 Unity gain bandwidth PSRR Power-supply rejection ratio VDD = 12 V to 18 V Output sink current VFB = 2.7 V, VCOMP = 1.1 V Output source current VFB = 2.3 V, VCOMP = 5 V VOH High-level output voltage VFB = 2.3 V, RLOAD = 15 k to GND VOL Low-level output voltage VFB = 2.7 V, RLOAD = 15 k to VREF V 60 dB V 0.1 1.1 V 3 3.15 V/V 3.15 V/V Current Sense Gain PSRR TA = 25°C (5) (6) TA = Full Range 2.85 (5) (6) Maximum input signal VFB < 2.4 V Power-supply rejection ratio VDD = 12 V to 18 V (2) (5) 2.825 Input bias current CS to output delay 0.9 1 1.1 70 V dB –0.1 –2 µA 35 70 ns COMP to CS offset VCS = 0 V 1.15 V VOUT low (RDS(on) pull-down) ISINK = 200 mA 5.5 15 Ω VOUT high (RDS(on) pull-up) ISOURCE = 200 mA 10 25 Ω Output (1) (2) (3) (4) (5) (6) 4 Adjust VDD above the start threshold before setting at 15 V. Not production tested. Output frequencies of the UCC28C41, UCC28C44, and UCC28C45 are one-half the oscillator frequency. Oscillator discharge current is measured with RT = 10 kΩ to VREF. Parameter measured at trip point of latch with VFB = 0 V. DV COM , 0 V v V ACS + CS v 900 mV DVCS Gain is defined as Submit Documentation Feedback 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 15.5 Undervoltage Lockout (UVLO) Start threshold Minimum operating voltage UCC28C42-EP, UCC28C44-EP 13.5 14.5 UCC28C43-EP, UCC28C45-EP 7.8 8.4 9 UCC28C40-EP, UCC28C41-EP 6.5 7 7.5 UCC28C42-EP, UCC28C44-EP 8 9 10 UCC28C43-EP, UCC28C45-EP 7 7.6 8.2 UCC28C40-EP, UCC28C41-EP 6.1 6.6 7.1 UCC28C42-EP, UCC28C43-EP, UCC28C40-EP, UCC28C44-EP, UCC28C45-EP, UCC28C41-EP 94 96 47 48 V V PWM Maximum duty cycle Minimum duty cycle % 0% Current Supply ISTART-UP Start-up current VDD = UVLO start threshold (–0.5 V) 50 100 µA IDD VFB = VCS = 0 V 2.3 3 mA Operating supply current PDIP (P) or SOIC (D) PACKAGE (TOP VIEW) COMP FB CS RT/CT 1 8 2 7 3 6 4 5 VREF VDD OUT GND Pin Assignments COMP: This pin provides the output of the error amplifier for compensation. In addition, the COMP pin is frequently used as a control port by utilizing a secondary-side error amplifier to send an error signal across the secondary-primary isolation boundary through an opto-isolator. CS: The current-sense pin is the noninverting input to the PWM comparator. This is compared to a signal proportional to the error amplifier output voltage. A voltage ramp can be applied to this pin to run the device with a voltage mode control configuration. FB: This pin is the inverting input to the error amplifier. The noninverting input to the error amplifier is internally trimmed to 2.5 V ± 1%. GND: Ground return pin for the output driver stage and the logic-level controller section. OUT: The output of the on-chip drive stage. OUT is intended to directly drive a MOSFET. The OUT pin in the UCC28C40, UCC28C42, and UCC28C43 is the same frequency as the oscillator, and can operate near 100% duty cycle. In the UCC28C41, UCC28C44, and the UCC28C45, the frequency of OUT is one-half that of the oscillator due to an internal T flipflop. This limits the maximum duty cycle to