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 <50%. RT/CT: Timing resistor and timing capacitor. The timing capacitor should be connected to the device ground using minimal trace length. VDD: Power supply pin for the device. This pin should be bypassed with a 0.1 µF capacitor with minimal trace lengths. Additional capacitance may be needed to provide hold up power to the device during startup. Submit Documentation Feedback 5 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. 6 Submit Documentation Feedback 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. The new series offers improved performance when compared to older bipolar devices and other competitive BiCMOS devices with similar functionality. Note that these improvements discussed below generally consist of tighter specification limits that are a subset of the older product ratings, maintaining drop-in capability. In new designs these improvements can be utilized to reduce the component count or enhance circuit performance when compared to the previously available devices. Advantages This device increases the total circuit efficiency whether operating off-line or in dc input circuits. In off-line applications the low start-up current of this device reduces steady state power dissipation in the startup resistor, and the low operating current maximizes efficiency while running. The low running current also provides an efficiency boost in battery-operated supplies. Low-Voltage Operation Two members of the UCC28C4x family are intended for applications that require a lower start-up voltage than the original family members. The UCC28C40 and UCC28C41 have a turn-on voltage of 7 V typical and exhibit hysteresis of 0.4 V for a turn-off voltage of 6.6 V. This reduced start-up voltage enables use in systems with lower voltages, such as 12 V battery systems that are nearly discharged. High-Speed Operation The BiCMOS design allows operation at high frequencies that were not feasible in the predecessor bipolar devices. First, the output stage has been redesigned to drive the external power switch in approximately one-half the time of the earlier devices. Second, the internal oscillator is more robust, with less variation as frequency increases. In addition, the current sense to output delay has been reduced by a factor of three, to 45 ns typical. These features combine to provide a device capable of reliable high-frequency operation. The UCC28C4x family oscillator is true to the curves of the original bipolar devices at lower frequencies, yet extends the frequency programmability range to at least 1 MHz. This allows the device to offer pin-to-pin capability where required, yet capable of extending the operational range to the higher frequencies typical of latest applications. When the original UC2842 was released in 1984, most switching supplies operated between 20 kHz and 100 kHz. Today, the UCC28C4x can be used in designs cover a span roughly ten times higher than those numbers. Start/Run Current Improvements The start-up current is only 60 µA typical, a significant reduction from the bipolar device's ratings of 300 µA (UC284xA). For operation over the temperature range of –55°C to 125°C, the UCC28C4x devices offer a maximum startup current of 100 µA, an improvement over competitive BiCMOS devices. This allows the power-supply designer to further optimize the selection of the start-up resistor value to provide a more efficient design. In applications where low component cost overrides maximum efficiency the low run current of 2.3 mA typical may allow the control device to run directly through the single resistor to (+) rail, rather than needing a bootstrap winding on the power transformer, along with a rectifier. The start/run resistor for this case must also pass enough current to allow driving the primary switching MOSFET, which may be a few milliamps in small devices. ±1% Initial Reference Voltage The BiCMOS internal reference of 2.5 V has an enhanced design and utilizes production trim to allow initial accuracy of ±1% at room temperature and ±2% over the full temperature range. This can be used to eliminate an external reference in applications that do not require the extreme accuracy afforded by the additional device. This is very useful for nonisolated dc-to-dc applications where the control device is referenced to the same common as the output. It is also applicable in offline designs that regulate on the primary side of the isolation boundary by looking at a primary bias winding, or perhaps from a winding on the output inductor of a buck-derived circuit. Submit Documentation Feedback 7 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. The UCC28C4x series now offers even tighter control of this parameter, with approximately ±3% accuracy at 25°C, and less than 10% variation over temperature using the UCC28C4x devices. This level of accuracy can enable a meaningful limit to be programmed, a feature not currently seen in competitive BiCMOS devices. The improved oscillator and reference also contribute to decreased variation in the peak-to-peak variation in the oscillator waveform, which is often used as the basis for slope compensation for the complete power system. Soft-Start Figure 1 provides a typical soft-start circuit for use with the UCC28C42. The values of R and C should be selected to bring the COMP pin up at a controlled rate, limiting the peak current supplied by the power stage. After the soft-start interval is complete, the capacitor continues to charge to VREF, effectively removing the PNP transistor from circuit considerations. The optional diode in parallel with the resistor forces a soft-start each time the PWM goes through UVLO and the reference (VREF) goes low. Without the diode, the capacitor otherwise remains charged during a brief loss of supply or brownout, and no soft-start is enabled upon reapplication of VIN. VREF 8 COMP 1 UCC28C42 GND 5 UDG-01072 Figure 1. Oscillator Synchronization The UCC28C4x oscillator has the same synchronization characteristics as the original bipolar devices. Thus, the information in the application report U-100A, UC2842/3/4/5 Provides Low-Cost Current-Mode Control (SLUA143) still applies. The application report describes how a small resistor from the timing capacitor to ground can offer an insertion point for synchronization to an external clock (see Figure 2 and Figure 3). Figure 2 shows how the UCC28C42 can be synchronized to an external clock source. This allows precise control of frequency and dead time with a digital pulse train. 8 Submit Documentation Feedback 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. Synchronization to an External Clock Precautions The absolute maximum supply voltage is 20 V, including any transients that may be present. If this voltage is exceeded, device damage is likely. This is in contrast to the predecessor bipolar devices that could survive up to 30 V. Thus, the supply pin should be decoupled as close to the ground pin as possible. Also, since no clamp is included in the device, the supply pin should be protected from external sources that could exceed the 20 V level. Careful layout of the printed board has always been a necessity for high-frequency power supplies. As the device switching speeds and operating frequencies increase, the layout of the converter becomes increasingly important. This 8-pin device has only a single ground for the logic and power connections. This forces the gate drive current pulses to flow through the same ground that the control circuit uses for reference. Thus, the interconnect inductance should be minimized as much as possible. One implication is to place the device (gate driver) circuitry close to the MOSFET it is driving. Note that this can conflict with the need for the error amplifier and the feedback path to be away from the noise generating components. Circuit Applications Figure 4 shows a typical off-line application. Submit Documentation Feedback 9 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. Typical Off-Line Application Figure 5 shows the forward converter with synchronous rectification. This application provides 48 V to 3.3 V at 10 A with over 85% efficiency, and uses the UCC28C42 as the secondary-side controller and UCC3961 as the primary-side startup control device. 10 Submit Documentation Feedback 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 21.5k C23 R17 R16 BAR74 R23 D5 BAR74 Q3 C17 4700pF 1500pF C11 4 3 2 1 4 3 2 1 Vcc DT Rt/Ct CS FB U2 LODR BTLO HIDR 7.5k R18 UCC28C4x PGND 5 6 7 8 C19 470uF 4700pF U4 TPS2832 BOOT IN COMP R27 4.7 10 R21 Q4 GND OUT Vcc REF 5 6 7 8 2uF C26 470uF C20 0.22uF C13 C14 1uF C24 0.1uF D6 BZX84C15LT1 PWRGND 0.1uF C21 3r3V R22 100 C15 1uF + 100pF Vs CS PGnd Out Vdd St UVS 2.4k R3 1.2k C25 0.047uF R20 10 C18 + R11 10nF 1 + 0.22uF C3 470uF C1 R1 32.4k 10k D2 T1 + VinN VinP R7 C2 1nF L1 4.7uH www.ti.com UCC28C4x-EP BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS SGLS352B – DECEMBER 2006 – REVISED MAY 2007 APPLICATION INFORMATION (continued) Figure 5. Forward Converter With Synchronous Rectification Using the UCC28C42 as the Secondary-Side Controller 11 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. 200 90 180 1.4 120 50 100 40 80 30 PHASE MARGIN 10 0 1M 1.2 COMP to CS 60 Phase Margin − (°) Gain − (dB) 70 140 1 k 10 k 100 k f − Frequency − Hz 1.0 0.8 60 0.6 40 0.4 20 0.2 0 10 M 0.0 −50 −25 0 25 50 TJ − Temperature − °C Figure 8. 12 125 1.6 GAIN 100 100 1.8 160 80 10 75 COMP to CS OFFSET VOLTAGE (with CS = 0) vs TEMPERATURE 100 1 50 Figure 7. ERROR AMPLIFIER FREQUENCY RESPONSE 20 25 TJ − Temperature − °C Figure 9. Submit Documentation Feedback 75 100 125 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 2.45 −25 0 25 50 75 100 125 −50 −25 TJ − Temperature − °C 50 75 100 Figure 10. Figure 11. REFERENCE SHORT-CIRCUIT CURRENT vs TEMPERATURE ERROR AMPLIFIER INPUT BIAS CURRENT vs TEMPERATURE 125 200 −37 IBIAS − Error Amplifier Input Bias Current − nA ISC − Reference Short Circuit Current − mA 25 TJ − Temperature − °C −35 −39 −41 −43 −45 −47 −49 −51 −53 −55 −50 0 150 100 50 0 −50 −100 −150 −200 −25 0 25 50 75 TJ − Temperature − °C 100 125 −50 Figure 12. −25 0 25 50 75 TJ − Temperature − °C 100 125 Figure 13. Submit Documentation Feedback 13 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. 100 125 Figure 15. UNDERVOLTAGE LOCKOUT vs TEMPERATURE (UCC28C41) SUPPLY CURRENT vs OSCILLATOR FREQUENCY 25 7.3 7.2 IDD − Supply Current − mA UVLO ON 7.1 VUVLO − UVLO Voltage − V 25 50 75 TJ − Temperature − °C 7.0 6.9 6.8 6.7 1-nF LOAD 20 15 10 NO LOAD 6.6 5 6.5 UVLO OFF 6.4 6.3 −50 0 0k −25 0 25 50 75 100 125 200 k 400 k 600 k f − Frequency − Hz TJ − Temperature − °C Figure 16. 14 Figure 17. Submit Documentation Feedback 800 k 1M 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. 100 125 100 125 MAXIMUM DUTY CYCLE vs TEMPERATURE 100 100 UCC28C40 UCC28C42 UCC28C43 CT = 220 pF 98 Maximum Duty Cycle − % 90 Duty Cycle − % 75 Figure 19. MAXIMUM DUTY CYCLE vs OSCILLATOR FREQUENCY 80 70 CT = 1 nF 96 94 92 60 50 50 TJ − Temperature − °C 0 500 1000 1500 2000 2500 90 −50 −25 0 25 50 75 TJ − Temperature − °C f − Frequency − kHz Figure 20. Figure 21. Submit Documentation Feedback 15 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. CS TO OUT DELAY TIME vs TEMPERATURE 70 tD − CS to OUT Delay Time − ns 65 60 55 50 45 40 35 30 −50 75 TJ − Temperature − °C TJ − Temperature − °C −25 0 25 50 75 TJ − Temperature − °C Figure 24. 16 50 Submit Documentation Feedback 100 125 100 125 PACKAGE OPTION ADDENDUM www.ti.com 9-Oct-2010 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) Samples (Requires Login) UCC28C43MDREP ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Contact TI Distributor or Sales Office UCC28C45MDREP ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Contact TI Distributor or Sales Office V62/07615-01XE ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Contact TI Distributor or Sales Office V62/07615-02XE ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Contact TI Distributor or Sales Office (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. 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.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. 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OTHER QUALIFIED VERSIONS OF UCC28C43-EP, UCC28C45-EP : Addendum-Page 1 PACKAGE OPTION ADDENDUM www.ti.com 9-Oct-2010 • Catalog: UCC28C43, UCC28C45 NOTE: Qualified Version Definitions: • Catalog - TI's standard catalog product Addendum-Page 2 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 12.0 Q1 Pack Materials-Page 1 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 35.0 Pack Materials-Page 2 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. 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