TL2843B-Q1 SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012 www.ti.com HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLER Check for Samples: TL2843B-Q1 FEATURES 1 • • • • • • • • • Qualified for Automotive Applications Low Start-Up Current (<0.5 mA) Trimmed Oscillator Discharge Current Current Mode Operation to 500 kHz Automatic Feed-Forward Compensation Latching PWM for Cycle-by-Cycle Current Limiting Internally Trimmed Reference With Undervoltage Lockout High-Current Totem-Pole Output Undervoltage Lockout With Hysteresis Double-Pulse Suppression DESCRIPTION The TL284xB series of control integrated circuits provide the features that are necessary to implement off-line or dc-to-dc fixed-frequency current-mode control schemes, with a minimum number of external components. Internally implemented circuits include an undervoltage lockout (UVLO) and a precision reference that is trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state. The TL284xB series are pin compatible with the standard TL284x with the following improvements. The start-up current is specified to be 0.5 mA (max), while the oscillator discharge current is trimmed to 8.3 mA (typ). In addition, during undervoltage lockout conditions, the output has a maximum saturation voltage of 1.2 V while sinking 10 mA (VCC = 5 V). Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges. Typical UVLO thresholds of 16 V (on) and 10 V (off) on the TL2842B and TL2844B devices make them ideally suited to off-line applications. The corresponding typical thresholds for the TL2843B and TL2845B devices are 8.4 V (on) and 7.6 V (off). The TL2842B and TL2843B devices can operate to duty cycles approaching 100%. A duty-cycle range of 0% to 50% is obtained by the TL2844B and TL2845B by the addition of an internal toggle flip-flop, which blanks the output off every other clock cycle.The TL284xB-series devices are characterized for operation from –40°C to 125°C. Table 1. ORDERING INFORMATION (1) PACKAGE (2) TA –40°C to 125°C (1) (2) SOIC – D Reel of 2500 ORDERABLE PART NUMBER TOP-SIDE MARKING TL2842BQDRQ1 Product Preview TL2843BQDRQ1 TL2843BQ TL2844BQDRQ1 Product Preview TL2845BQDRQ1 Product Preview For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. 1 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 © 2010–2012, Texas Instruments Incorporated TL2843B-Q1 SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012 www.ti.com 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. FUNCTIONAL BLOCK DIAGRAM VCC 12 34 V NOM GND UVLO 9 − 5-V VREF 14 EN + VREF Internal Bias 2.5 V VREF Good Logic RT/CT 7 10 OSC OUTPUT T Error Amplifier VFB COMP ISENSE 2 3 + − 1 5 S 2R R R 1V PWM Latch CurrentSense Comparator Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): TL2843B-Q1 TL2843B-Q1 SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012 www.ti.com ABSOLUTE MAXIMUM RATINGS (1) (2) over operating free-air temperature range (unless otherwise noted) MIN Low impedance source VCC Supply voltage VI Analog input voltage range ICC IO MAX UNIT 30 Self limiting V 6.3 V Supply current 30 mA Output current ±1 A IO(sink) Error amplifier output sink current 10 mA θJA Package thermal impedance (3) 97 °C/W ICC < 30 mA (4) D package Output energy TJ Virtual junction temperature Tstg Storage temperature range (1) (2) (3) (4) –0.3 VFB and ISENSE Capacitive load –65 5 μJ 150 °C 150 °C 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 the device GND terminal. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can impact reliability. The package thermal impedance is calculated in accordance with JESD 51-7. RECOMMENDED OPERATING CONDITIONS MIN VCC Supply voltage VI Input voltage VO Output voltage ICC Supply current, externally limited IO IO(ref) fosc Oscillator frequency TA Operating free-air temperature (1) NOM MAX VCC 30 VC (1) 30 RT/CT 0 5.5 VFB and ISENSE 0 5.5 0 30 –0.1 1 OUTPUT POWER GROUND (1) UNIT V V V 25 mA Average output current 200 mA Reference output current –20 mA 500 kHz 125 °C 100 –40 The recommended voltages for VC and POWER GROUND apply only to the 14-pin D package. Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): TL2843B-Q1 3 TL2843B-Q1 SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012 www.ti.com REFERENCE SECTION ELECTRICAL CHARACTERISTICS VCC = 15 V (1), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified) PARAMETER TEST CONDITIONS TL284xB MIN TYP (2) MAX 4.95 UNIT Output voltage IO = 1 mA, TJ = 25°C 5 5.05 Line regulation VCC = 12 V to 25 V 6 20 mV Load regulation IO = 1 mA to 20 mA 6 25 mV 0.2 0.4 mV/°C 5.1 V 5 25 mV –100 –180 mA Average temperature coefficient of output voltage Output voltage, worst-case variation VCC = 12 V to 25 V, IO = 1 mA to 20 mA Output noise voltage f = 10 Hz to 10 kHz, TJ = 25°C Output-voltage long-term drift After 1000 h at TJ = 25°C μV 50 –30 Short-circuit output current (1) (2) 4.9 V Adjust VCC above the start threshold before setting it to 15 V. All typical values are at TJ = 25°C. OSCILLATOR SECTION (1) ELECTRICAL CHARACTERISTICS VCC = 15 V (2), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified) PARAMETER Initial accuracy TEST CONDITIONS MIN TYP (3) MAX TJ = 25°C 49 52 55 TA = Tlow to Thigh 48 250 275 0.2 1 TJ = 25°C, RT = 6.2 kΩ, CT = 1 nF Voltage stability TL284xB 225 VCC = 12 V to 25 V Temperature stability Amplitude Discharge current (4) (1) (2) (3) (4) 4 Peak to peak TJ = 25°C, RT/CT = 2 V 7.8 RT/CT = 2 V 7.5 56 UNIT kHz % 5 % 1.7 V 8.3 8.8 8.8 mA Output frequency equals oscillator frequency for the TL2842B and TL2843B. Output frequency is one-half the oscillator frequency for the TL2844B and TL2845B. Adjust VCC above the start threshold before setting it to 15 V. All typical values are at TJ = 25°C. Specified by design. Not production tested. Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): TL2843B-Q1 TL2843B-Q1 SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012 www.ti.com ERROR-AMPLIFIER SECTION ELECTRICAL CHARACTERISTICS VCC = 15 V (1), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified) PARAMETER TEST CONDITIONS Feedback input voltage COMP = 2.5 V TL284xB MIN 2.45 Input bias current Open-loop voltage amplification VO = 2 V to 4 V 65 Gain-bandwidth product Supply-voltage rejection ratio VCC = 12 V to 25 V Output sink current VFB = 2.7 V, COMP = 1.1 V Output source current VFB = 2.3 V, COMP = 5 V High-level output voltage VFB = 2.3 V, RL = 15 kΩ to GND Low-level output voltage VFB = 2.7 V, RL = 15 kΩ to GND (1) (2) UNIT TYP (2) MAX 2.5 2.55 V –0.3 –1 μA 90 dB 0.7 1 MHz 60 70 dB 2 6 mA –0.5 –0.8 mA 5 6 0.7 V 1.1 V Adjust VCC above the start threshold before setting it to 15 V. All typical values are at TJ = 25°C. CURRENT-SENSE SECTION ELECTRICAL CHARACTERISTICS VCC = 15 V (1), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified) PARAMETER Voltage amplification (3) TEST CONDITIONS (4) Current-sense comparator threshold (3) Supply-voltage rejection ratio (3) COMP = 5 V VCC = 12 V to 25 V Input bias current Delay time to output (5) (1) (2) (3) (4) (5) VFB = 0 V to 2 V TL284xB UNIT MIN TYP (2) MAX 2.85 3 3.15 V/V 0.9 1 1.1 V –2 –10 μA 150 300 ns 70 dB Adjust VCC above the start threshold before setting it to 15 V. All typical values are at TJ = 25°C. Measured at the trip point of the latch, with VFB at 0 V. Measured between ISENSE and COMP, with the input changing from 0 V to 0.8 V. Specified by design. Not production tested. Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): TL2843B-Q1 5 TL2843B-Q1 SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012 www.ti.com Output Section Electrical Characteristics VCC = 15 V (1), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified) PARAMETER High-level output voltage TL284xB TEST CONDITIONS MIN TYP (2) IOH = –20 mA 13 13.5 IOH = –200 mA 12 13.5 MAX UNIT V IOL = 20 mA 0.1 0.4 IOL = 200 mA 1.5 2.2 Rise time (3) CL = 1 nF, TJ = 25°C 50 150 ns Fall time (3) CL = 1 nF, TJ = 25°C 50 150 ns VCC = 5 V, IOL = 1 mA 0.7 1.2 V Low-level output voltage UVLO saturation (1) (2) (3) (3) V Adjust VCC above the start threshold before setting it to 15 V. All typical values are at TJ = 25°C. Specified by design. Not production tested. UNDERVOLTAGE-LOCKOUT SECTION ELECTRICAL CHARACTERISTICS VCC = 15 V (1), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified) PARAMETER TL284xB TEST CONDITIONS Start threshold voltage Minimum operating voltage after start-up (1) (2) UNIT MIN TYP (2) 7.8 8.4 9 V 7 7.6 8.2 V MAX Adjust VCC above the start threshold before setting it to 15 V. All typical values are at TJ = 25°C. PULSE-WIDTH MODULATOR SECTION ELECTRICAL CHARACTERISTICS VCC = 15 V (1), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified) PARAMETER TEST CONDITIONS Maximum duty cycle (3) TL284xB TYP (2) MAX 94 96 100 % 0 % Minimum duty cycle (1) (2) (3) UNIT MIN Adjust VCC above the start threshold before setting it to 15 V. All typical values are at TJ = 25°C. Specified by design. Not production tested. SUPPLY VOLTAGE ELECTRICAL CHARACTERISTICS VCC = 15 V (1), RT = 10 kΩ, CT = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified) PARAMETER TEST CONDITIONS TL284xB MIN Start-up current Operating supply current VFB and ISENSE at 0 V Limiting voltage ICC = 25 mA (1) (2) 6 30 UNIT TYP (2) MAX 0.3 0.5 mA 11 17 mA 34 V Adjust VCC above the start threshold before setting it to 15 V. All typical values are at TJ = 25°C. Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): TL2843B-Q1 TL2843B-Q1 SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012 www.ti.com TYPICAL CHARACTERISTICS AVOL – Open-Loop Voltage Gain – dB 25 15 5 TL2842 10 TL2845 ICC – Supply Current – mA 20 100 200 80 150 60 Phase 40 50 20 0 Gain VCC = 15 V 0 -50 kΩ RL = 100 kX TA = 25°C -20 0 1 . E +0 1 0 5 10 15 20 25 30 35 100 Phase Margin – deg ERROR AMPLIFIER OPEN-LOOP GAIN AND PHASE vs FREQUENCY SUPPLY CURRENT vs SUPPLY VOLTAGE 10 40 1 . E +0 2 100 1 . E +0 3 1 . E +0 4 1 . E +0 5 10k 100k 1k f – Frequency – Hz 1 . E +0 6 1M -100 10M 1 . E +0 7 VCC – Supply Voltage – V CURRENT-SENSE INPUT THRESHOLD vs ERROR AMPLIFIER OUTPUT VOLTAGE OSCILLATOR DISCHARGE CURRENT vs TEMPERATURE 9.2 VIN = 15 V Idisharge – Oscillator Discharge Current – mA Vth – Current-Sense Input Threshold – V 1.2 1 0.8 TA = 125°C 0.6 TA = 25°C 0.4 TA = -55°C 0.2 0 0 1 2 3 4 5 6 7 8 VIN = 15 V 9 VOSC = 2 V 8.8 8.6 8.4 8.2 8 7.8 7.6 7.4 -55 -35 -15 VO – Error Amplifier Output Voltage – V 5 25 45 65 85 105 125 145 TA – Temperature – °C Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): TL2843B-Q1 7 TL2843B-Q1 SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) REFERENCE VOLTAGE vs SOURCE CURRENT REFERENCE VOLTAGE vs TEMPERATURE 5.2 0 5.15 Vref – Reference Voltage – V Reference Voltage Delta – mV -10 -20 TA = -40°C -30 TA = 125°C -40 TA = 25°C -50 5.1 5.05 5 4.95 4.9 4.85 -60 0 20 40 60 80 100 120 140 4.8 -55 160 -30 -5 Isrc – Source Current – mA 20 45 70 95 120 145 TA – Temperature – °C REFERENCE SHORT-CIRCUIT CURRENT vs TEMPERATURE OUTPUT SATURATION VOLTAGE vs LOAD CURRENT 180 10 VIN = 15 V 0 Source Saturation TA = 25°C 9 -1 8 Sink Saturation Voltage – V ISC – Short-Circuit Current – mA 160 140 120 100 80 -2 TA = -55°C 7 -3 6 -4 5 -5 4 -6 Sink Saturation 3 2 -8 60 TA = 25°C 1 40 -55 -9 0 -30 -5 20 45 70 95 120 145 0 100 TA – Temperature – °C 8 -7 TA = -55°C 200 300 400 500 600 700 -10 800 IO – Output Load Current – mA Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): TL2843B-Q1 TL2843B-Q1 SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) MAXIMUM OUTPUT DUTY CYCLE vs TIMING RESISTOR 100 Dmax – Maximum Duty Cycle – % VCC = 15 V CT = 3.3 nF 90 TA = 25°C 80 70 60 50 40 0.1 1 10 kΩ RT – Timing Resistor – k€ Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): TL2843B-Q1 9 TL2843B-Q1 SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012 www.ti.com APPLICATION INFORMATION The error-amplifier configuation circuit is shown in Figure 1. 2.5 V 0.5 mA Error Amplifier VFB Zi COMP Zf A. + − Error amplifier can source or sink up to 0.5 mA. Figure 1. Error-Amplifier Configuration The current-sense circuit is shown in Figure 2. Error Amplifier IS (see Note A) 2R + − R 1V COMP Rf RS Current-Sense Comparator ISENSE Cf GND A. Peak current (IS) is determined by the formula: IS(max) = 1 V/RS B. A small RC filter formed by resistor Rf and capacitor Cf may be required to suppress switch transients. Figure 2. Current-Sense Circuit The oscillator frequency is set using the circuit shown in Figure 3. The frequency is calculated as: f = 1 / RTCT For RT > 5 kΩ: f ≉ 1.72 / RTCT VREF RT RT/CT CT GND Figure 3. Oscillator Section 10 Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): TL2843B-Q1 TL2843B-Q1 SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012 www.ti.com TIMING RESISTANCE vs FREQUENCY DEAD TIME vs TIMING CAPACITANCE 100 100 CT = 10 nF VCC = 15 V RT ≥ 5 kΩ TA = 25°C 40 CT = 4.7 nF CT = 2.2 nF R T − Timing Resistance − k Ω Dead Time − µ s 40 10 4 1 CT = 1 nF CT = 22 nF 10 CT = 47 nF CT = 100 nF 4 0.4 VCC = 15 V TA = 25°C 1 100 0.1 1 4 10 40 100 1k 10k 100k 1M f − Frequency − Hz CT − Timing Capacitance − nF Open-Loop Laboratory Test Fixture In the open-loop laboratory test fixture (see Figure 4), high peak currents associated with loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to the GND terminal in a single-point ground. The transistor and 5-kΩ potentiometer sample the oscillator waveform and apply an adjustable ramp to the ISENSE terminal. REF RT A 4.7 kΩ VCC 2N2222 100 kΩ 1-kΩ Error Amplifier Adjust VFB 5 kΩ VREF COMP TL284xB TL384xB 0.1 µF VCC 0.1 µF ISENSE OUTPUT 1 kΩ, 1 W OUTPUT 4.7 kΩ ISENSE Adjust RT/CT GND GND CT Figure 4. Open-Loop Laboratory Test Fixture Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): TL2843B-Q1 11 TL2843B-Q1 SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012 www.ti.com Shutdown Technique The PWM controller (see Figure 5) can be shut down by two methods: either raise the voltage at ISENSE above 1 V or pull the COMP terminal below a voltage two diode drops above ground. Either method causes the output of the PWM comparator to be high (see the Functional Block Diagram). The PWM latch is reset dominant so that the output remains low until the next clock cycle after the shutdown condition at the COMP or ISENSE terminal is removed. In one example, an externally latched shutdown can be accomplished by adding an SCR that resets by cycling VCC below the lower UVLO threshold. At this point, the reference turns off, allowing the SCR to reset. 1 kΩ VREF COMP Shutdown 330 Ω ISENSE 500 Ω Shutdown To Current-Sense Resistor Figure 5. Shutdown Techniques A fraction of the oscillator ramp can be summed resistively with the current-sense signal to provide slope compensation for converters requiring duty cycles over 50% (see Figure 6). Note that capacitor C forms a filter with R2 to suppress the leading-edge switch spikes. VREF 0.1 µF RT RT/CT CT R1 ISENSE R2 ISENSE C RSENSE Figure 6. Slope Compensation 12 Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): TL2843B-Q1 TL2843B-Q1 SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012 www.ti.com REVISION HISTORY Changes from Original (July 2012) to Revision A Page • Changed the pinout from an 8-pin to 14-pin D package ....................................................................................................... 1 • Changed the Functional Block diagram pin numbers for the 14-pin D package .................................................................. 2 Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): TL2843B-Q1 13 PACKAGE OPTION ADDENDUM www.ti.com 31-Jan-2012 PACKAGING INFORMATION Orderable Device TL2843BQDRQ1 Status (1) Package Type Package Drawing ACTIVE SOIC D Pins Package Qty 14 2500 Eco Plan (2) Green (RoHS & no Sb/Br) Lead/ Ball Finish MSL Peak Temp (3) Samples (Requires Login) CU NIPDAU Level-1-260C-UNLIM (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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