SG1524B/SG2524B/SG3524B REGULATING PULSE WIDTH MODULATOR DESCRIPTION FEATURES The SG1524B is a pulse width modulator for switching power supplies which features improved performance over industry standards like the SG1524. A direct pin-for-pin replacement for the earlier device, it combines advanced processing techniques and circuit design to provide improved reference accuracy, and extended common mode range at the error amplifier and current limit inputs. A DC-coupled flip-flop eliminates triggering and glitch problems, and a PWM data latch prevents edge oscillations. The circuit incorporates true digital shutdown for high speed response, while an undervoltage lockout circuit prevents spurious outputs when the supply voltage is too low for stable operation. Full double-pulse suppression logic insures alternating output pulses when the Shutdown pin is used for pulse-by-pulse current limiting. The SG1524B is specified for operation over the full military ambient temperature range of -55°C to 125°C. The SG2524B is characterized for the industrial range of -25°C to 85°C, and the SG3524B is designed for the commercial range of 0°C to 70°C. • • • • • • • • • • • 7V to 40V operation 5V reference trimmed to ±1% 100Hz to 400KHz oscillator range Excellent external sync capability Dual 100mA output transistors Wide current limit common mode range DC-coupled toggle flip-flop PWM data latch Undervoltage lockout Full double-pulse suppression logic 60V output collectors HIGH RELIABILITY FEATURES - SG1524B ♦ Available to MIL-STD-883 and DESC SMD ♦ Scheduled for MIL-M-38510 QPL listing ♦ Radiation data available ♦ LMI level "S" processing available DESCRIPTION VREF +VIN Reference Regulator Undervoltage Lockout GROUND To Internal Circuitry RT OSC Oscillator COLLECTOR A CT S EMITTER A Q T R S P.W.M. INVERTING Q D Error Q MEMORY F/F Q COLLECTOR B TOGGLE F/F Q NON-INVERTING +VIN EMITTER B PWM LATCH +C.L. SENSE C.L. -C.L. SENSE COMPENSATION SHUTDOWN LINFINITY 2/00 Rev 1.3 2/00 Copyright 2000 1 Microelectronics Inc. 11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞ FAX: (714) 893-2570 SG1524B/SG2524B/SG3524B ABSOLUTE MAXIMUM RATINGS (Note 1) Oscillator Charging Current ..............................................5mA Operating Junction Temperature Hermetic (J, L Packages) ............................................150°C Plastic (N, DW Packages) ...........................................150°C Storage Temperature Range ............................-65°C to 150°C Lead Temperature (Soldering, 10 seconds) ...................300°C Input Voltage (+VIN) .......................................................... 42V Collector Voltage ............................................................. 60V Logic Inputs .......................................................... -0.3V to 5.5V Current Limit Sense Inputs .....................................-0.3V to VIN Output Current (each transistor) ................................. 200mA Reference Load Current ............................................... 50mA Note 1. Values beyond which damage may occur. THERMAL DATA J Package: Thermal Resistance-Junction to Case, θJC .................. 30°C/W Thermal Resistance-Junction to Ambient, θJA ............... 80°C/W N Package: Thermal Resistance-Junction to Case, θJC .................. 40°C/W Thermal Resistance-Junction to Ambient, θJA .............. 65°C/W DW Package: Thermal Resistance-Junction to Case, θJC ................... 40°C/W Thermal Resistance-Junction to Ambient, θJA .............. 95°C/W L Package: Thermal Resistance-Junction to Case, θJC ................... 35°C/W Thermal Resistance-Junction to Ambient, θJA ............ 120°C/W RECOMMENDED OPERATING CONDITIONS Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA). Note B. The above numbers for θJC are maximums for the limiting thermal resistance of the package in a standard mounting configuration. The θJA numbers are meant to be guidelines for the thermal performance of the device/pcboard system. All of the above assume no ambient airflow. (Note 2) Oscillator Frequency Range ........................ 100Hz to 400KHz Oscillator Timing Resistor (RT) ......................... 2KΩ to 150KΩ Oscillator Timing Capacitor (CT) .......................... 1nF to 0.1µF Operating Ambient Temperature Range SG1524B .................................................... -55°C to 125°C SG2524B ...................................................... -25°C to 85°C SG3524B ......................................................... 0°C to 70°C Input Voltage (+VIN) ................................................ 7V to 40V Collector Voltage .................................................... 0V to 60V Error Amp Common Mode Range ....................... 2.3V to VREF Current Limit Sense Common Mode Range ...... 0V to VIN-2.5V Output Current (each transistor) .......................... 0 to 100mA Reference Load Current ........................................ 0 to 20mA Oscillator Charging Current ............................ 25µA to 1.8mA Note 2: Range over which the device is functional. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1524B with -55°C ≤ TA ≤ 125°C, SG2524B with 25°C ≤ TA ≤ 85°C, SG3524B with 0°C ≤ TA ≤ 70°C, and +VIN = 20V. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) Parameter Reference Section (Note 3) Output Voltage Line Regulation Load Regulation Temperature Stability (Note 7) Total Output Voltage Range Short Circuit Current Test Conditions TJ = 25°C VIN = 7V to 40V IL = 0 to 20mA Over Operating Temperature Range Over Line, Load and Temperature VREF = 0V Undervoltage Lockout Section Threshold Voltage SG1524B/2524B SG3524B Units Min. Typ. Max. Min. Typ. Max. 4.95 5.00 5.05 4.90 5.00 5.10 3 20 3 30 5 30 5 50 15 50 15 50 4.90 5.10 4.80 5.20 25 50 120 25 50 120 4.3 4.5 4.7 4.2 4.5 4.9 V mV mV mV V mA V Note 3. IL = 0mA LINFINITY 2/00 Rev 1.3 2/00 Copyright 2000 2 Microelectronics Inc. 11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞ FAX: (714) 893-2570 SG1524B/SG2524B/SG3524B ELECTRICAL CHARACTERISTICS Parameter (continued) Test Conditions Oscillator Section (Note 4) Initial Accuracy TJ = 25°C Voltage Stability VIN = 7V to 40V Temperature Stability (Note 7) Over Operating Range Minimum Frequency (Note 7) RT = 150KΩ, CT = 0.1µF Maximum Frequency RT = 2KΩ, CT = 470pF Sawtooth Peak Voltage VIN = 40V Sawtooth Valley Voltage VIN = 7V Clock Amplitude Clock Pulse Width Error Amplifier Section (Note 5) Input Offset Voltage RS ≤ 2KΩ Input Bias Current Input Offset Current DC Open Loop Gain RL ≥10MΩ ISINK = 100µA; VPIN 1 - VPIN 2 ≥ 150mV Output Low Level Output High Level ISOURCE = 100µA; VPIN 2 - VPIN 1 ≥ 150mV VCM = 2.3V to VREF Common Mode Rejection VIN = 7V to 40V Supply Voltage Rejection Gain-Bandwidth Product (Note 7 ) TJ = 25°C P.W.M. Comparator (Note 4) Minimum Duty Cycle VCOMP = 0.5V Maximum Duty Cycle VCOMP = 3.9V Current Limit Amplifier Section (Note 6) Sense Voltage Input Bias Current Shutdown Input Section HIGH Input Voltage HIGH Input Current VSHUTDOWN = 5.0V LOW Input Voltage Output Section (each transistor) Collector Leakage Current VCE = 60V Collector Saturation Voltage IC = 10mA IC = 100mA Emitter Output Voltage IE = 10mA IE = 100mA Emitter Voltage Rise Time (Note 7) RE = 2KΩ, TA = 25°C Collector Voltage Fall Time RC = 2KΩ, TA = 25°C Power Consumption Standby Current Note 4. Note 5. Note 6. Note 7. VIN = 40V, VSHUTDOWN = 2.0V SG1524B/2524B SG3524B Units Min. Typ. Max. Min. Typ. Max. 42 400 0.6 3.0 0.2 60 45 0.1 1 50 600 3.5 1 4.0 0.5 48 1 2 140 0.5 1 5 5 1 40 400 3.9 1.2 0.6 3.0 0.2 60 3.8 70 76 1 78 0.2 4.2 90 100 2 45 49 180 200 -3 220 -10 0.1 1 0.6 45 0.1 1 50 600 3.5 1 4.0 0.5 50 1 2 120 2 1 10 10 1 3.8 70 76 1 78 0.2 4.2 90 100 2 45 49 170 0.5 0 2.0 17.5 17 3.9 1.2 0.5 5 50 0.4 2.0 % % 200 -3 230 -10 mV µA 0.1 1 0.6 V mA V 0.5 0.2 0.2 1.0 19 18 0.2 0.1 12 5 17.5 17 mV µA µA dB V V dB dB MHz 0 2.0 0.2 1.0 19 18 0.2 0.1 KHz % % Hz KHz V V V µs 0.5 0.2 µA V V V V µs µs 12 mA 50 0.4 2.0 FOSC = 45KHz (RT = 2700Ω, CT = .01µF) VCM = 2.3V to VREF VCM = 0V to 17.5V These parameters, although guaranteed over the recommended operating conditions, are not tested in production. LINFINITY 2/00 Rev 1.3 2/00 Copyright 2000 3 Microelectronics Inc. 11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞ FAX: (714) 893-2570 SG1524B/SG2524B/SG3524B TYPICAL CHARACTERISTIC CURVES 1000000 100000 Oscillator Freq (Hz) 1nF 3nF 10000 10nF 0.1uF 1000 1uF 100 1000 10000 RT (Ohm) 100000 1000000 Figure 1 Oscillator Frequency vs. Timing Resistor and Capacitor VIN=20V, TA=25°C 5 Dead Time (uS) 4 3 2 1 0 0 10 20 30 40 50 60 70 80 90 100 C T (nF) Figure 2 SG1524B Dead Time vs. Timing capacitance (RT=2.7k) VIN=20V, TA=25°C Open Loop Voltage Gain (dB) 60 RF=1M 50 RF=300K 40 RF=100K 30 20 10 0 100 1000 10000 100000 1000000 FREQUENCY (Hz) Figure 3 SG1524B Error Amp Voltage Gain vs. Freq over RF VIN=20V, TA=25°C LINFINITY 2/00 Rev 1.3 2/00 Copyright 2000 4 Microelectronics Inc. 11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞ FAX: (714) 893-2570 SG1524B/SG2524B/SG3524B CONNECTION DIAGRAMS & ORDERING INFORMATION Package 16-PIN CERAMIC DIP J - PACKAGE Part No. (See Notes Below) Ambient Temperature Range SG1524BJ/883B SG1524BJ/DESC SG1524BJ SG2524BJ SG3524BJ -55°C -55°C -55°C -25°C 0°C to to to to to 125°C 125°C 125°C 85°C 70°C 16-PIN PLASTIC DIP N - PACKAGE SG2524BN SG3524BN -25°C to 85°C 0°C to 70°C 16-PIN WIDE BODY PLASTIC S.O.I.C. DW - PACKAGE SG2524BDW SG3524BDW -25°C to 85°C 0°C to 70°C Connection Diagram INV. INPUT N.I. INPUT OSC. OUTPUT +C.L. SENSE -C.L. SENSE RT CT 1 16 2 15 3 14 4 13 5 12 6 11 7 10 GROUND 8 9 INV. INPUT N.I. INPUT OSC. OUTPUT +C.L. SENSE -C.L. SENSE RT CT GROUND 20-PIN CERAMIC LEADLESS CHIP CARRIER L- PACKAGE SG1524BL/883B SG1524BL -55°C to 125°C -55°C to 125°C 1. N.C. 2. INV. INPUT 3. N.I. INPUT 4. OSC. OUTPUT 5. +C.L. SENSE 6. N.C. 7. -C.L. SENSE 8. RT 9. CT 10. GROUND 3 VREF +VIN EB CB CA EA SHUTDOWN COMPENSATION 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 2 1 V REF +V IN EB CB CA EA SHUTDOWN COMPENSATION 20 19 4 18 5 17 6 16 7 15 8 14 9 10 11 12 13 11. N.C. 12. COMP 13. SHUTDOWN 14. EA 15. CA 16. N.C. 17. CB 18. EB 19. +VIN 20. VREF Note 1. Contact factory for JAN and DESC product availablity. 2. All packages are viewed from the top. LINFINITY 2/00 Rev 1.3 2/00 Copyright 2000 5 Microelectronics Inc. 11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞ FAX: (714) 893-2570