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SG1524B/SG2524B/SG3524B
REGULATING PULSE WIDTH MODULATOR
DESCRIPTION
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 -55C to 125C. The SG2524B is characterized for the industrial range of -25C to 85C, and the SG3524B is designed for the commercial range of 0C to 70C.
FEATURES
* * * * * * * * * * * 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 GROUND
Reference Regulator
Undervoltage Lockout OSC
To Internal Circuitry RT CT Oscillator
COLLECTOR A
S T R INVERTING Error NON-INVERTING +VIN +C.L. SENSE C.L. -C.L. SENSE P.W.M. D Q PWM LATCH S Q Q
Q Q TOGGLE F/F
EMITTER A
COLLECTOR B
MEMORY F/F
EMITTER B
COMPENSATION
SHUTDOWN
2/00 Rev 1.3 2/00
Copyright 2000
1
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1524B/SG2524B/SG3524B
ABSOLUTE MAXIMUM RATINGS
(Note 1)
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.
Oscillator Charging Current ..............................................5mA Operating Junction Temperature 150C Hermetic (J, L Packages) ............................................ 150C Plastic (N, DW Packages) ........................................... -65C to 150C Storage Temperature Range ............................ Lead Temperature (Soldering, 10 seconds) ...................300C
THERMAL DATA
J Package: Thermal Resistance-Junction to Case, JC .................. 30C/W Thermal Resistance-Junction to Ambient, JA ............... 80C/W N Package: Thermal Resistance-Junction to Case, JC .................. 40C/W Thermal Resistance-Junction to Ambient, JA .............. 65C/W DW Package: Thermal Resistance-Junction to Case, JC ................... 40C/W Thermal Resistance-Junction to Ambient, JA .............. 95C/W L Package: Thermal Resistance-Junction to Case, JC ................... 35C/W Thermal Resistance-Junction to Ambient, JA ............ 120C/W
Note A. Junction Temperature Calculation: TJ = TA + (PD x JA). Note B. The above numbers for JC are maximums for the limiting
thermal resistance of the package in a standard mounting configuration. The JA numbers are meant to be guidelines for the thermal performance of the device/pcboard system. All of the above assume no ambient airflow.
RECOMMENDED OPERATING CONDITIONS
(Note 2)
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 ............................ 25A to 1.8mA
Note 2: Range over which the device is functional.
Oscillator Frequency Range ........................ 100Hz to 400KHz Oscillator Timing Resistor (RT) ......................... 2K to 150K Oscillator Timing Capacitor (CT) .......................... 1nF to 0.1F Operating Ambient Temperature Range SG1524B .................................................... -55C to 125C SG2524B ...................................................... -25C to 85C SG3524B ......................................................... 0C to 70C
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1524B with -55C TA 125C, SG2524B with 25C TA 85C, SG3524B with 0C TA 70C, 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 Undervoltage Lockout Section Threshold Voltage
Note 3. IL = 0mA
Test Conditions TJ = 25C VIN = 7V to 40V IL = 0 to 20mA Over Operating Temperature Range Over Line, Load and Temperature VREF = 0V
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
2/00 Rev 1.3 2/00
Copyright 2000
2
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1524B/SG2524B/SG3524B
ELECTRICAL CHARACTERISTICS
Parameter
(continued)
Test Conditions
SG1524B/2524B SG3524B Units Min. Typ. Max. Min. Typ. Max. 42 45 0.1 1 50 600 3.5 1 4.0 0.5 0.5 1 60 3.8 70 76 1 78 0.2 4.2 90 100 2 48 1 2 140 3.9 0.6 3.0 0.2 40 45 0.1 1 50 600 3.5 1 4.0 0.5 2 1 60 0.5 3.8 70 76 1 0 45 180 49 200 -3 220 -10 45 170 49 200 -3 230 -10 78 0.2 4.2 90 100 2 50 1 2 120 3.9 KHz % % Hz KHz V V V s mV A A dB V V dB dB MHz % % mV A V mA V A V V V V s s mA
Oscillator Section (Note 4) Initial Accuracy TJ = 25C Voltage Stability VIN = 7V to 40V Temperature Stability (Note 7) Over Operating Range Minimum Frequency (Note 7) RT = 150K, CT = 0.1F Maximum Frequency RT = 2K, 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 2K Input Bias Current Input Offset Current DC Open Loop Gain RL 10M ISINK = 100A; VPIN 1 - VPIN 2 150mV Output Low Level Output High Level ISOURCE = 100A; 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 = 25C 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 = 2K, TA = 25C Collector Voltage Fall Time RC = 2K, TA = 25C Power Consumption Standby Current
Note 4. Note 5. Note 6. Note 7.
400 0.6 3.0 0.2
400
1.2 5 5 1
1.2 10 10 1 0.5
0
2.0 0.1 1 0.6 50 0.4 2.0
2.0 0.1 1 0.6 50 0.4 2.0
17.5 17
0.2 1.0 19 18 0.2 0.1 5
17.5 17 0.5 0.2 12
0.2 1.0 19 18 0.2 0.1 5
0.5 0.2 12
VIN = 40V, VSHUTDOWN = 2.0V
FOSC = 45KHz (RT = 2700, CT = .01F) VCM = 2.3V to VREF VCM = 0V to 17.5V These parameters, although guaranteed over the recommended operating conditions, are not tested in production.
2/00 Rev 1.3 2/00
Copyright 2000
3
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1524B/SG2524B/SG3524B
TYPICAL CHARACTERISTIC CURVES
1000000
100000 Oscillator Freq (Hz) 1nF 3nF 10000 10nF
1000 1uF
0.1uF
100 1000
10000
RT (Ohm)
100000
1000000
Figure 1
Oscillator Frequency vs. Timing Resistor and Capacitor VIN=20V, TA=25C
5
4
Dead Time (uS)
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=25C
60
Open Loop Voltage Gain (dB)
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=25C 2/00 Rev 1.3 2/00
Copyright 2000
4
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1524B/SG2524B/SG3524B
CONNECTION DIAGRAMS & ORDERING INFORMATION
Package
16-PIN CERAMIC DIP J - PACKAGE (See Notes Below)
Part No.
Ambient Temperature Range -55C -55C -55C -25C 0C to to to to to 125C 125C 125C 85C 70C
Connection Diagram
INV. INPUT N.I. INPUT OSC. OUTPUT +C.L. SENSE -C.L. SENSE RT CT GROUND
1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9
SG1524BJ/883B SG1524BJ/DESC SG1524BJ SG2524BJ SG3524BJ SG2524BN SG3524BN SG2524BDW SG3524BDW
VREF +VIN EB CB CA EA SHUTDOWN COMPENSATION
16-PIN PLASTIC DIP N - PACKAGE 16-PIN WIDE BODY PLASTIC S.O.I.C. DW - PACKAGE
-25C to 85C 0C to 70C -25C to 85C 0C to 70C
INV. INPUT N.I. INPUT OSC. OUTPUT +C.L. SENSE -C.L. SENSE RT CT GROUND
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
V REF +V IN EB CB CA EA SHUTDOWN COMPENSATION
20-PIN CERAMIC LEADLESS CHIP CARRIER L- PACKAGE
SG1524BL/883B SG1524BL
-55C to 125C -55C to 125C
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
2
1
20 19
4 5 6 7 8
18 17 16 15 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. 2/00 Rev 1.3 2/00
Copyright 2000
5
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.

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