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| Order this document by SG3526/D SG3526 Pulse Width Modulation Control Circuit The SG3526 is a high performance pulse width modulator integrated circuit intended for fixed frequency switching regulators and other power control applications. Functions included in this IC are a temperature compensated voltage reference, sawtooth oscillator, error amplifier, pulse width modulator, pulse metering and steering logic, and two high current totem pole outputs ideally suited for driving the capacitance of power FETs at high speeds. Additional protective features include soft start and undervoltage lockout, digital current limiting, double pulse inhibit, adjustable dead time and a data latch for single pulse metering. All digital control ports are TTL and B-series CMOS compatible. Active low logic design allows easy wired-OR connections for maximum flexibility. The versatility of this device enables implementation in single-ended or push-pull switching regulators that are transformerless or transformer coupled. The SG3526 is specified over a junction temperature range of 0 to +125C. * 8.0 V to 35 V Operation PULSE WIDTH MODULATION CONTROL CIRCUIT SEMICONDUCTOR TECHNICAL DATA 18 1 * * * * * * * * * * 5.0 V 1% Trimmed Reference 1.0 Hz to 400 kHz Oscillator Range Dual Source/Sink Current Outputs: 100 mA Digital Current Limiting Programmable Dead Time Undervoltage Lockout Single Pulse Metering Programmable Soft-Start Wide Current Limit Common Mode Range Guaranteed 6 Unit Synchronization N SUFFIX PLASTIC PACKAGE CASE 707 PIN CONNECTIONS +Error -Error Compensation 1 2 3 4 5 6 7 8 9 (Top View) 18 Vref 17 VCC 16 Output B 15 Ground 14 VC 13 Output A 12 Sync 11 RDeadtime 10 CT Representative Block Diagram CSoft-Start Vref VCC Ground Sync RDeadtime RT CT Reset CSoft-Start 18 17 Reference Regulator 15 12 11 9 Oscillator 10 Under- Voltage Lockout To Internal Circuitry 14 VC 13 Output A 5 4 3 VCC 1 2 7 6 8 + - + - Amp - + SQ D Q Soft Start Memory F/F S RQ Toggle F/F Q T Q 16 Output B Reset -CS +CS Shutdown RT Compensation +Error -Error +C.S. -C.S. Shutdown ORDERING INFORMATION Device SG3526N Operating Temperature Range TJ = 0 to +125C Package Plastic DIP Rev 2 Metering F/F (c) Motorola, Inc. 1996 MOTOROLA ANALOG IC DEVICE DATA 1 SG3526 MAXIMUM RATINGS (Note 1) Rating Supply Voltage Collector Supply Voltage Logic Inputs Analog Inputs Output Current, Source or Sink Reference Load Current (VCC = 40 V, Note 2) Logic Sink Current Power Dissipation TA = +25C (Note 3) TC = +25C (Note 4) Thermal Resistance Junction-to-Air Thermal Resistance Junction-to-Case Operating Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10 Seconds) PD 1000 3000 RJA RJC TJ Tstg TSolder 100 42 +150 -65 to +150 300 C/W C/W C C C IO Iref Symbol VCC VC Value +40 +40 -0.3 to +5.5 -0.3 to VCC 200 50 15 Unit Vdc Vdc V V mA mA mA mW NOTES: 1. Values beyond which damage may occur. 2. Maximum junction temperature must be observed. 3. Derate at 10 mW/C for ambient temperatures above +50C. 4. Derate at 24 mW/C for case temperatures above +25C. RECOMMENDED OPERATING CONDITIONS Characteristics Supply Voltage Collector Supply Voltage Output Sink/Source Current (Each Output) Reference Load Current Oscillator Frequency Range Oscillator Timing Resistor Oscillator Timing Capacitor Available Deadtime Range (40 kHz) Operating Junction Temperature Range Symbol VCC VC IO Iref fosc RT CT - TJ Min 8.0 4.5 0 0 0.001 2.0 0.001 3.0 0 Max 35 35 100 20 400 150 20 50 +125 Unit Vdc Vdc mA mA kHz k F % C 2 MOTOROLA ANALOG IC DEVICE DATA SG3526 ELECTRICAL CHARACTERISTICS (VCC = +15 Vdc, TJ = Tlow to Thigh [Note 5], unless otherwise noted.) Characteristics REFERENCE SECTION (Note 6) Reference Output Voltage (TJ = +25C) Line Regulation (+8.0 V VCC +35 V) Load Regulation (0 mA IL 20 mA) Temperature Stability Total Reference Output Voltage Variation (+8.0 V VCC +35 V, 0 mA IL 20 mA) Short Circuit Current (Vref = 0 V) (Note 2) UNDERVOLTAGE LOCKOUT Reset Output Voltage (Vref = +3.8 V) Reset Output Voltage (Vref = +4.8 V) OSCILLATOR SECTION (Note 7) Initial Accuracy (TJ = +25C) Frequency Stability over Power Supply Range (+8.0 V VCC +35 V) Frequency Stability over Temperature (TJ = Tlow to Thigh) Minimum Frequency (RT = 150 k, CT = 20 F) Maximum Frequency (RT = 2.0 k, CT = 0.001 F) Sawtooth Peak Voltage (VCC = +35 V) Sawtooth Valley Voltage (VCC = +8.0 V) ERROR AMPLIFIER SECTION (Note 8) Input Offset Voltage (RS 2.0 k) Input Bias Current Input Offset Current DC Open Loop Gain (RL 10 M) High Output Voltage (VPin 1-VPin 2 +150 mV, Isource = 100 A) Low Output Voltage (VPin 2-VPin 1 +150 mV, Isink = 100 A) Common Mode Rejection Ratio (RS 2.0 k) Power Supply Rejection Ratio (+12 V VCC +18 V) NOTES: 2. Maximum junction temperature must be observed. 5. Tlow = 0C Thigh = +125C 6. IL = 0 mA unless otherwise noted. 7. fosc = 40 kHz (RT = 4.12 k 1%, CT = 0.01 F 1%, RD = 0 ) 8. 0 V VCM +5.2 V. Symbol Min Typ Max Unit Vref Regline Regload Vref/T Vref ISC 4.90 - - - 4.85 25 5.00 10 10 10 5.00 80 5.10 30 50 - 5.15 125 V mV mV mV V mA - 2.4 0.2 4.8 3.0 0.5 0.4 - 8.0 1.0 V V - fosc V CC fosc TJ fmin fmax Vosc(P) Vosc(V) - % % - 2.0 - % - 400 - 0.45 0.5 - 3.0 0.8 - - 3.5 - Hz kHz V V VIO IIB IIO AVOL VOH VOL CMRR PSRR - - - 60 3.6 - 70 66 2.0 -350 35 72 4.2 0.2 94 80 10 -2000 200 - - 0.4 - - mV nA nA dB V V dB dB MOTOROLA ANALOG IC DEVICE DATA 3 SG3526 ELECTRICAL CHARACTERISTICS (continued) Characteristics PWM COMPARATOR SECTION (Note 7) Minimum Duty Cycle (VCompensation = +0.4 V) Maximum Duty Cycle (VCompensation = +3.6 V) DIGITAL PORTS (SYNC, SHUTDOWN, RESET) Output Voltage (High Logic Level) (Isource = 40 A) (Low Logic Level) (Isink = 3.6 mA) Input Current High Logic Level (High Logic Level) (VIH = +2.4 V) (Low Logic Level) (VIL = +0.4 V) CURRENT LIMIT COMPARATOR SECTION (Note 9) Sense Voltage (RS 50 ) Input Bias Current SOFT-START SECTION Error Clamp Voltage (Reset = +0.4 V) CSoft-Start Charging Current (Reset = +2.4 V) OUTPUT DRIVERS (Each Output, VC = +15 Vdc, unless otherwise noted.) Output High Level Isource = 20 mA Isource = 100 mA Output Low Level Isink = 20 mA Isink = 100 mA Collector Leakage, VC = +40 V Rise Time (CL = 1000 pF) Fall Time (CL = 1000 pF) Supply Current (Shutdown = +0.4 V, VCC = +35 V, RT = 4.12 k) NOTES: 7. fosc = 40 kHz (RT = 4.12 k 1%, CT = 0.01 F 1%, RD = 0 ) 8. 0 V VCM +5.2 V 9. 0 V VCM +12 V Symbol Min Typ Max Unit DCmin DCmax - 45 - 49 0 - % % V VOH VOL IIH IIL 2.4 - - - 4.0 0.2 -125 -225 - 0.4 A -200 -360 Vsense IIB 80 100 -3.0 120 -10 mA A - ICS 50 0.1 100 0.4 150 V A VOH 12.5 12 VOL - - IC(leak) tr tf ICC - - - - 0.2 1.2 50 0.3 0.1 18 0.3 2.0 150 0.6 0.2 30 13.5 13 - - V V A s s mA 4 MOTOROLA ANALOG IC DEVICE DATA SG3526 Figure 2. Reference Voltage as a Function Supply Voltage Figure 1. Reference Stability over Temperature V ref , REFERENCE VOLTAGE (V) -50 -25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C) 150 5.0 4.0 3.0 2.0 1.0 1.0 2.0 3.0 4.0 5.0 10 20 30 40 VCC, SUPPLY VOLTAGE (V) 50 mV Spec Limit -75 Figure 3. Error Amplifier Open Loop Frequency Response 8.0 7.0 A Vol , VOLTAGE GAIN (dB) SHUTDOWN VOLTAGE (V) CComp Figure 4. Current Limit Comparator Threshold 80 60 40 20 0 10 100 1 2 + _ 100 pF 3 6.0 5.0 4.0 3.0 2.0 1.0 1.0 k 10 k 100 k 1.0 M 10 M 0 25 50 75 100 125 150 175 200 DIFFERENTIAL INPUT VOLTAGE (mV) f, FREQUENCY (Hz) 8.0 7.0 RESET VOLTAGE (V) 6.0 5.0 4.0 3.0 2.0 1.0 0 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Vref, REFERENCE VOLTAGE (V) V sat , OUTPUT DRIVER SATURATION VOLTAGE (V) Figure 5. Undervoltage Lockout Characteristic Figure 6. Output Driver Saturation Voltage as a Function of Sink Current 2.5 2.0 1.5 1.0 0.5 0 2.0 5.0 10 20 50 100 200 OUTPUT DRIVER SINK CURRENT (mA) MOTOROLA ANALOG IC DEVICE DATA 5 SG3526 Figure 7. VC Saturation Voltage as a Function of Sink Current 2.5 V SAT , SATURATION VOLTAGE (V) 2.0 1.5 1.0 0.5 0 2.0 200 R T, TIMING RESISTOR (k ) 100 50 20 10 5.0 2.0 0.005 0.01 0.02 0.002 RD = 0 Figure 8. Oscillator Period 0.05 0.1 0.2 0.5 1.0 2.0 OSCILLATOR PERIOD (ms) Figure 9. Error Amplifier VCC Figure 10. Undervoltage Lockout Vref Q6 To Reset R1 + 1.2V Bandgap Reference Q12 100A 14A Q10 Q2 1.0k 500 1.0k 1 + Error 500 3 Compensation 100A R2 - To Driver A To Driver B Q5 125 A Q3 50A 50A Q4 Vref Q11 14A Q7 Q1 Q8 100 A Q9 - Error Figure 11. Pulse Processing Logic Memory F/F Sync SQ PWM D Q Metering F/F PWM The memory Flip-Flop prevents double pulsing in a push-pull configuration by remembering which output produced the last pulse. S R Q Clock The metering Flip-Flop is an asynchronous data latch which suppresses high frequency oscillations by allowing only one PWM pulse per oscillator cycle. 6 MOTOROLA ANALOG IC DEVICE DATA 100 200 500 1000 5.0 10 20 50 IC, SINK CURRENT (mA) 100 200 5.0 10 20 50 SG3526 APPLICATIONS INFORMATION Figure 12. Extending Reference Output Current Capability Figure 13. Error Amplifier Connections Negative Output Voltage C* Vref 27 VCC 17 Reference Regulator 15 Gnd * May be required with some types of transistors Vout = Vref R1 + R2 R2 R3 = R1R2 R1 + R2 18 + 10F Gnd Vref R3 1+ 2- R2 R1 Positive Output Voltage Gnd R3 Vref R2 R1 1+ 2- Vout = Vref R1 R2 Figure 14. Oscillator Connections Figure 15. Foldback Current Limiting Output Filter RS + 11 SG3526 12 Sync 8 -6 R1 +7 R2 Vout RD 9 10 RT CT 0.1 V + I(max) = Gnd Vout R1 R1 + R2 RS ISC = - 0.1 V RS Figure 16. Soft-Start Circuity Figure 17. Driving VMOS Power FETs +12V Vref 100 A + Error - Error Reset 1 2 5 Ramp - PWM + + Error - Amp Q2 Q1 14 VC A 13 SG3526 B 16 Gnd To Undervoltage Lockout Q3 CSoft-Start The totem pole output drivers of the SG3526 are ideally suited for driving the input capacitance of power FETs at high speeds. MOTOROLA ANALOG IC DEVICE DATA 7 SG3526 Figure 18. Half-Bridge Configuration +V Supply R1 C1 14 VC A 13 SG3526 Gnd 15 B 16 T1 Q1 T2 Q2 C2 8 4 C1 S 5 14 VC A B SG3526 +CS 13 16 7 6 R3 D1 D2 Q1 +V Supply R1 C2 R4 T1 Figure 19. Flyback Converter with Current Limiting R -CS CS Gnd 15 R2 In the above circuit, current limiting is accomplished by using the current limit comparator output to reset the soft-start capacitor. Figure 20. Single-Ended Configuration +V Supply R1 Q1 To Output Filter R2 14 VC SG3526 B Gnd 15 Figure 21. Push-Pull Configuration +V Supply R1 C1 14 VC 13 R2 Q1 C2 16 R3 Q2 T1 A A 13 16 SG3526 B Gnd 15 8 MOTOROLA ANALOG IC DEVICE DATA SG3526 OUTLINE DIMENSIONS N SUFFIX PLASTIC PACKAGE CASE 707-02 ISSUE C NOTES: 1. POSITIONAL TOLERANCE OF LEADS (D), SHALL BE WITHIN 0.25 (0.010) AT MAXIMUM MATERIAL CONDITION, IN RELATION TO SEATING PLANE AND EACH OTHER. 2. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 3. DIMENSION B DOES NOT INCLUDE MOLD FLASH. MILLIMETERS MIN MAX 22.22 23.24 6.10 6.60 3.56 4.57 0.36 0.56 1.27 1.78 2.54 BSC 1.02 1.52 0.20 0.30 2.92 3.43 7.62 BSC 0_ 15_ 0.51 1.02 INCHES MIN MAX 0.875 0.915 0.240 0.260 0.140 0.180 0.014 0.022 0.050 0.070 0.100 BSC 0.040 0.060 0.008 0.012 0.115 0.135 0.300 BSC 0_ 15 _ 0.020 0.040 18 1 10 B 9 A C L DIM A B C D F G H J K L M N N F H G D SEATING PLANE K M J MOTOROLA ANALOG IC DEVICE DATA 9 SG3526 Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. 1-800-441-2447 or 602-303-5454 MFAX: RMFAX0@email.sps.mot.com - TOUCHTONE 602-244-6609 INTERNET: http://Design-NET.com JAPAN: Nippon Motorola Ltd.; Tatsumi-SPD-JLDC, 6F Seibu-Butsuryu-Center, 3-14-2 Tatsumi Koto-Ku, Tokyo 135, Japan. 03-81-3521-8315 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298 10 MOTOROLA ANALOG IC DEVICE DATA SG3526/D *SG3526/D* |
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