TL598 PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS053C – FEBRUARY 1988 – REVISED JULY 1999 D D D D D D D D D D Complete PWM Power Control Function Totem-Pole Outputs for 200-mA Sink or Source Current Output Control Selects Parallel or Push-Pull Operation Internal Circuitry Prohibits Double Pulse at Either Output Variable Dead-Time Provides Control Over Total Range Internal Regulator Provides a Stable 5-V Reference Supply, Trimmed to 1% Tolerance On-Board Output Current-Limiting Protection Undervoltage Lockout for Low VCC Conditions Separate Power and Signal Grounds TL598Q Has Extended Temperature Range . . . –40°C to 125°C D OR N PACKAGE (TOP VIEW) 1IN+ ERROR AMP 2 16 2IN+ 2 15 2IN– 3 14 REF DTC 4 13 OUTPUT CTRL CT 5 12 RT 6 11 VCC VC SIGNAL GND 7 10 POWER GND OUT1 8 9 ERROR AMP 1 1IN– FEEDBACK 1 OUT2 description The TL598 incorporates all the functions required in the construction of pulse-width-modulated (PWM) controlled systems on a single chip. Designed primarily for power-supply control, the TL598 provides the systems engineer with the flexibility to tailor the power-supply control circuits to a specific application. The TL598 contains two error amplifiers, an internal oscillator (externally adjustable), a dead-time control (DTC) comparator, a pulse-steering flip-flop, a 5-V precision reference, undervoltage lockout control, and output control circuits. Two totem-pole outputs provide exceptional rise- and fall-time performance for power FET control. The outputs share a common source supply and common power ground terminals, which allow system designers to eliminate errors caused by high current-induced voltage drops and common-mode noise. The error amplifier has a common-mode voltage range from 0 V to VCC –2 V. The DTC comparator has a fixed offset that prevents overlap of the outputs during push-pull operation. A synchronous multiple supply operation can be achieved by connecting RT to the reference output and providing a sawtooth input to CT. ǒ+ Ǔ The TL598 device provides an output control function to select either push-pull or parallel operation. Circuit architecture prevents either output from being pulsed twice during push-pull operation. The output frequency 1 for push-pull applications is one-half the oscillator frequency f O . For single-ended applications: 2 RT CT 1 . fO RT CT + The TL598C is characterized for operation from 0°C to 70°C. The TL598Q is characterized for operation from –40°C to 125°C. 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. Copyright 1999, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 TL598 PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS053C – FEBRUARY 1988 – REVISED JULY 1999 FUNCTION TABLE INPUT/OUTPUT CTRL VI = GND VI = REF OUTPUT FUNCTION Single-ended or parallel output Normal push-pull operation AVAILABLE OPTIONS PACKAGED DEVICES SMALL OUTLINE (D) PLASTIC DIP (N) 0°C to 70°C TL598CD TL598CN –40°C to 125°C TL598QD – TA CHIP FORM (Y) TL598Y Chip forms are tested at 25°C. functional block diagram OUTPUT CTRL (see Function Table) 13 RT CT 6 5 Oscillator DTC Comparator ≈ 0.1 V DTC 4 1IN– 2IN+ 2IN– FEEDBACK 1 2 16 15 11 VC 8 OUT1 C1 Error Amplifier 1IN+ 1D + – PWM Comparator 1 9 Error Amplifier + 2 – Pulse-Steering Flip-Flop 3 Reference Regulator Undervoltage Lockout Control OUT2 10 POWER GND 12 V CC 14 REF 7 SIGNAL GND 0.7 mA 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TL598 PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS053C – FEBRUARY 1988 – REVISED JULY 1999 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 V Amplifier input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC + 0.3 V Collector voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 V Output current (each output), sink or source, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 mA Package thermal impedance, θJA (see Notes 2 and 3): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73°C/W N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88°C/W Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 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. NOTES: 1. All voltage values, except differential voltages, are with respect to the signal ground terminal. 2. 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. 3. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace length of zero. recommended operating conditions MIN MAX Supply voltage, VCC 7 40 V Amplifier input voltage, VI 0 VCC–2 40 V Collector voltage Output current (each output), sink or source, IO Current into feedback terminal, IIL Timing capacitor, CT Timing resistor, RT Oscillator frequency, fosc Operating O erating free-air tem temperature erature, TA POST OFFICE BOX 655303 UNIT V 200 mA 0.3 mA 0.00047 10 µF 1.8 500 kΩ 1 300 kHz TL598C 0 70 TL598Q –40 125 °C • DALLAS, TEXAS 75265 3 TL598 PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS053C – FEBRUARY 1988 – REVISED JULY 1999 electrical characteristics over recommended operating free-air temperature range, VCC = 15 V (unless otherwise noted) reference section (see Note 4) TEST CONDITIONS† PARAMETER MIN TA = 25°C TA = full range Output voltage (REF) IO = 1 mA Input regulation VCC = 7 V to 40 V Output regulation IO = 1 mA to 10 mA Output voltage change with temperature ∆TA = MIN to MAX TL598C TYP‡ 4.95 5 4.9 TA = 25°C TA = 25°C MAX MIN 5.05 4.95 5.1 4.9 TL598Q TYP‡ 5 5.05 25 2 22 1 15 1 15 50 2 V 5.1 2 TA = full range UNIT MAX mV mV 80 10 2 10 mV/V Short-circuit output current§ REF = 0 V –10 –48 –10 –48 mA † Full range is 0°C to 70°C for the TL598C, and –40°C to 125°C for the TL598Q. ‡ All typical values except for parameter changes with temperature are at TA = 25°C. § Duration of the short circuit should not exceed one second. NOTE 4: Pulse-testing techniques that maintain the junction temperature as close to the ambient temperature as possible must be used. oscillator section, CT = 0.001 µF, RT = 12 kΩ (see Figure 1) (see Note 4) TL598C, TL598Q TYP‡ MAX TEST CONDITIONS† PARAMETER Frequency Standard deviation of frequency¶ All values of VCC, CT, RT, TA constant Frequency change with voltage VCC = 7 V to 40 V, ∆TA = full range TA = 25°C ∆TA = full range, CT = 0.01 µF Frequency change with temperature# UNIT MIN † Full range is 0°C to 70°C for the TL598C, and –40°C to 125°C for the TL598Q. ‡ All typical values except for parameter changes with temperature are at TA = 25°C. ¶ Standard deviation is a measure of the statistical distribution about the mean as derived from the formula: s + 100 kHz 100 Hz/kHz Ǹ 1 10 70 120 50 80 ȍ+ ǒ Hz/kHz Hz/kHz Ǔ N x n–X n 1 2 N–1 # Effects of temperature on external RT and CT are not taken into account. NOTE 4. Pulse-testing techniques that maintain the junction temperature as close to the ambient temperature as possible must be used. error amplifier section (see Note 4) PARAMETER TL598C, TL598Q MIN TYP‡ MAX TEST CONDITIONS Input offset voltage FEEDBACK = 2.5 V Input offset current Input bias current Common-mode input voltage range VCC = 7 V to 40 V Open-loop voltage amplification ∆VO (FEEDBACK) = 3 V, VO (FEEDBACK) = 0.5 V to 3.5 V 70 2 10 FEEDBACK = 2.5 V 25 250 nA FEEDBACK = 2.5 V 0.2 1 µA ∆VIC = 6.5 V, 65 Output sink current (FEEDBACK) VCC = 40 V, FEEDBACK = 0.5 V 0.3 Output source current (FEEDBACK) FEEDBACK = 3.5 V Phase margin at unity gain FEEDBACK = 0.5 V to 3.5 V, 0 to VCC–2 Unity-gain bandwidth Common-mode rejection ratio UNIT TA = 25°C V 95 dB 800 kHz 80 dB 0.7 mA –2 RL = 2 kΩ mV mA 65° Supply-voltage rejection ratio FEEDBACK = 2.5 V, ∆VCC = 33 V, RL = 2 kΩ 100 dB ‡ All typical values except for parameter changes with temperature are at TA = 25°C. NOTE 4. Pulse-testing techniques that maintain the junction temperature as close to the ambient temperature as possible must be used. 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TL598 PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS053C – FEBRUARY 1988 – REVISED JULY 1999 electrical characteristics over recommended operating free-air temperature range, VCC = 15 V (unless otherwise noted) undervoltage lockout section (see Note 4) TL598C TEST CONDITIONS† PARAMETER Threshold voltage TA = 25°C ∆TA = full range Hysteresis‡ TA = 25°C TA = full range MIN TL598Q MAX MIN 4 6 4 6 3.5 6.9 3 6.9 100 100 50 30 MAX UNIT V mV † Full range is 0°C to 70°C for the TL598C, and –40°C to 125°C for the TL598Q. ‡ Hysteresis is the difference between the positive-going input threshold voltage and the negative-going input threshold voltage. NOTE 4. Pulse-testing techniques must be used that maintain the junction temperature as close to the ambient temperature as possible. output section (see Note 4) PARAMETER TL598C, TL598Q TEST CONDITIONS MIN High level output voltage High-level VCC = 15 V,, VC = 15 V IO = –200 mA IO = –20 mA Low level output voltage Low-level VCC = 15 V,, VC = 15 V IO = 200 mA IO = 20 mA Output control input current Output-control VI = Vref VI = 0.4 V MAX 12 UNIT V 13 2 0.4 V 3.5 mA 100 µA NOTE 4. Pulse-testing techniques must be used that maintain the junction temperature as close to the ambient temperature as possible. dead-time control section (see Figure 1) (see Note 4) PARAMETER Input bias current (DTC) Maximum duty cycle, each output Input threshold voltage (DTC) TEST CONDITIONS VI = 0 to 5.25 V DTC = 0 V TL598C MIN TYP§ –2 MAX –10 0.45 Zero duty cycle MAX –2 –25 3 3.2 UNIT µA 0.45 3 Maximum duty cycle TL598Q MIN TYP§ 0 3.3 0 V § All typical values except for parameter changes with temperature are at TA = 25°C. NOTE 4. Pulse-testing techniques must be used that maintain the junction temperature as close to the ambient temperature as possible. pwm comparator section (see Note 4) PARAMETER Input threshold voltage (FEEDBACK) TEST CONDITIONS TL598C, TL598Q TYP§ MAX UNIT 3.75 V MIN DTC = 0 V 4.5 Input sink current (FEEDBACK) V(FEEDBACK) = 0.5 V 0.3 0.7 mA § All typical values except for parameter changes with temperature are at TA = 25°C. NOTE Pulse-testing techniques must be used that maintain the junction temperature as close to the ambient temperature as possible. total device (see Figure 1) (see Note 4) PARAMETER Standby supply current TEST CONDITIONS RT = Vref, All other inputs and outputs open VCC = 15 V VCC = 40 V TL598C, TL598Q TYP§ MAX MIN 15 21 20 26 UNIT mA Average supply current DTC = 2 V 15 mA § All typical values except for parameter changes with temperature are at TA = 25°C. NOTE 4. Pulse-testing techniques must be used that maintain the junction temperature as close to the ambient temperature as possible. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 TL598 PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS053C – FEBRUARY 1988 – REVISED JULY 1999 electrical characteristics over recommended operating free-air temperature range, VCC = 15 V (unless otherwise noted) switching characteristics, TA = 25°C (see Note 4) PARAMETER Output-voltage rise time Output-voltage fall time TL598C, TL598Q TEST CONDITIONS CL = 1500 pF, See Figure 2 VC = 15 V, MIN VCC = 15 V, TYP MAX 60 150 35 75 UNIT ns NOTE 4. Pulse-testing techniques must be used that maintain the junction temperature as close to the ambient temperature as possible. electrical characteristics, VCC = 15 V, TA = 25°C reference section (see Note 4) TL598Y PARAMETER TEST CONDITIONS Output voltage (REF) MIN TYP† UNIT MAX IO = 1 mA VCC = 7 V to 40 V 5 V Input regulation 2 mV Output regulation IO = 1 mA to 10 mA 1 mV 2 mV/V Output-voltage change with temperature Short-circuit output current‡ REF = 0 V –48 mA † All typical values except for parameter changes with temperature are at TA = 25°C. ‡ Duration of the short circuit should not exceed one second. NOTE 4. Pulse-testing techniques that maintain the junction temperature as close to the ambient temperature as possible must be used. oscillator section, CT = 0.001 µF, RT = 12 kΩ (see Figure 1) (see Note 4) PARAMETER TL598Y TEST CONDITIONS MIN Frequency Standard deviation of frequency§ All values of VCC, CT, RT, TA constant Frequency change with voltage VCC = 7 V to 40 V, § Standard deviation is a measure of the statistical distribution about the mean as derived from the formula: s + TYP Ǹ UNIT MAX 100 kHz 100 Hz/kHz ȍǒ n 1 Hz/kHz Ǔ N +1 x n–X 2 N–1 NOTE 4. Pulse-testing techniques that maintain the junction temperature as close to the ambient temperature as possible must be used. error amplifier section (see Note 4) PARAMETER TL598Y TEST CONDITIONS MIN TYP 2 MAX UNIT Input offset voltage Feedback = 2.5 V Input offset current Feedback = 2.5 V 25 nA Input bias current Feedback = 2.5 V 0.2 µA Open-loop voltage amplification ∆VO (FEEDBACK) = 3 V, VO (FEEDBACK) = 0.5 V to 3.5 V 95 dB 800 kHz ∆VIC = 6.5 V, 80 dB Output sink current (FEEDBACK) VCC = 40 V, FEEDBACK = 0.5 V 0.7 mA Phase margin at unity gain FEEDBACK = 0.5 V to 3.5 V, Unity-gain bandwidth Common-mode rejection ratio RL = 2 kΩ mV 65° ∆VCC = 33 V, RL = 2 kΩ 100 dB NOTE 4. Pulse-testing techniques that maintain the junction temperature as close to the ambient temperature as possible must be used. Supply-voltage rejection ratio 6 FEEDBACK = 2.5 V, POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TL598 PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS053C – FEBRUARY 1988 – REVISED JULY 1999 electrical characteristics, VCC = 15 V, TA = 25°C dead-time control section (see Figure 1) (see Note 4) PARAMETER TEST CONDITIONS Input bias current (DTC) TL598Y MIN VI = 0 to 5.25 V Zero duty cycle Input threshold voltage (DTC) TYP MAX UNIT –2 µA 3 V NOTE 4. Pulse-testing techniques that maintain the junction temperature as close to the ambient temperature as possible must be used. pwm comparator section (see Note 4) PARAMETER TEST CONDITIONS Input threshold voltage (FEEDBACK) DTC = 0 V Input sink current (FEEDBACK) FEEDBACK = 0.5 V TL598Y MIN TYP MAX UNIT 3.75 V 0.7 mA NOTE 4. Pulse-testing techniques that maintain the junction temperature as close to the ambient temperature as possible must be used. total device (see Figure 1) (see Note 4) PARAMETER TL598Y TEST CONDITIONS Standby supply current RT = Vref, All other inputs and outputs open Average supply current DTC = 2 V MIN VCC = 15 V VCC = 40 V TYP 15 20 15 MAX UNIT mA mA NOTE 4. Pulse-testing techniques that maintain the junction temperature as close to the ambient temperature as possible must be used. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 7 TL598 PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS053C – FEBRUARY 1988 – REVISED JULY 1999 PARAMETER MEASUREMENT INFORMATION Output VC 15 V 1 2 Test Inputs 3 4 5 6 0.001 µF 12 VCC IN+ IN– ERROR AMP 1 IN+ ERROR AMP 2 IN– 15 50 kΩ FEEDBACK DTC REF CT OUTPUT CTRL RT VC OUT1 12 kΩ 7 16 OUT2 SIGNAL GND POWER GND POWER GND 14 13 11 8 9 OUTPUT CONFIGURATION 15 V OUTPUT 1 OUTPUT 2 – VI + FEEDBACK 10 REF – + MAIN DEVICE TEST CIRCUIT ERROR AMPLIFIER TEST CIRCUIT Figure 1. Test Circuits VC 90% 90% Output CL = 1500 pF POWER GND OUTPUT CONFIGURATION 10% 10% 0V tr tf OUTPUT VOLTAGE WAVEFORM Figure 2. Switching Output Configuration and Voltage Waveform 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TL598 PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS053C – FEBRUARY 1988 – REVISED JULY 1999 TYPICAL CHARACTERISTICS OSCILLATOR FREQUENCY AND FREQUENCY VARIATION † vs TIMING RESISTANCE AMPLIFIER VOLTAGE AMPLIFICATION vs FREQUENCY 80 100 k VCC = 15 V VCC = 15 V ∆VO = 3 V TA = 25°C Amplifier Voltage Amplification – dB fosc – Oscillator Frequency – Hz 40 k –2% 10 k 4k 0.001 µF –1% 0.01 µF 0% 0.1 µF 1k 400 100 † ∆f = 1% CT = 1 µF 40 10 1k 4k 10 k 40 k 100 k RT – Timing Resistance – Ω 400 k 1M 60 40 20 0 1k 10 k 100 k 1M f – Frequency – Hz † Frequency variation (∆f) is the change in predicted oscillator frequency that occurs over the full temperature range. Figure 4 Figure 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 9 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER’S RISK. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI’s publication of information regarding any third party’s products or services does not constitute TI’s approval, warranty or endorsement thereof. Copyright 1999, Texas Instruments Incorporated