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Part: SG3524
Category:
Power Management
-> Regulators
-> Switching Regulators
Description: Regulating Pulse Width Modulator
Company: Microsemi Corporation
Datasheet: Download SG3524 datasheet File size : 1010 kB
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SG1524/SG2524/SG3524
REGULATING PULSE WIDTH MODULATOR
DESCRIPTION
This monolithic integrated circuit contains all the control circuitry for a regulating power supply inverter or switching regulator. Included in a 16pin dual-in-line package is the voltage reference, error amplifier, oscillator, pulse width modulator, pulse steering flip-flop, dual alternating output switches and current limiting and shut-down circuitry. This device can be used for switching regulators of either polarity, transformer coupled DC to DC converters, transformerless voltage doublers and polarity converters, as well as other power applications. The SG1524 is specified for operation over the full military ambient temperature range of -55°C to +125°C, the SG2524 for -25°C to +85°C, and the SG3524 is designed for commercial applications of 0°C to +70°C.
FEATURES
· · · · · · · · · · · 8V to 40V operation 5V reference Reference line and load regulation of 0.4% Reference temperature coefficient < ± 1% 100Hz to 300KHz oscillator range Excellent external sync capability Dual 50mA output transistors Current limit circuitry Complete PWM power control circuitry Single ended or push-pull outputs Total supply current less than 10mA
HIGH RELIABILITY FEATURES - SG1524
Available to MIL-STD-883B and DESC SMD MIL-M-38510/12601BEA - JAN1524J Radiation data available LMI level "S" processing available
BLOCK DIAGRAM
4/90 Rev 1.1 2/94
Copyright © 1994
1
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1524/SG2524/SG3524
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage (+VIN ) .... 42V Collector Voltage ....... 40V Logic Inputs .. -0.3V to 5.5V Current Limit Sense Inputs .. -0.3V to 0.3V Output Current (each transistor) ... 100mA Reference Load Current ........ 50mA
Note 1. Values beyond which damage may occur.
Oscillator Charging Current ...... 5mA Operating Junction Temperature Hermetic (J, L Packages) ............ 150°C Plastic (N, D Packages) ..... 150°C Storage Temperature Range ..... -65°C to 150°C Lead Temperature (Soldering, 10 seconds) ........... 300°C
THERMAL DATA
J Package: Thermal Resistance-Junction to Case, JC ......... 30°C/W Thermal Resistance-Junction to Ambient, JA ..... 80°C/W N Package: Thermal Resistance-Junction to Case, JC ......... 40°C/W Thermal Resistance-Junction to Ambient, JA .... 65°C/W D Package: Thermal Resistance-Junction to Case, JC .......... 50°C/W Thermal Resistance-Junction to Ambient, JA ... 120°C/W L Package: Thermal Resistance-Junction to Case, JC ......... 35°C/W Thermal Resistance-Junction to Ambient, JA .. 120°C/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) ......... 8V to 40V Collector Voltage ....... 0V to 40V Error Amp Common Mode Range ..1.8V to 3.4V Current Limit Sense Common Mode Range ........ -0.3V to 0.3V Output Current (each transistor) ....... 0 to 50mA Reference Load Current .......... 0 to 20mA Oscillator Charging Current .......... 30µ A to 2mA Oscillator Frequency Range ....... 100Hz to 300KHz Oscillator Timing Resistor (RT) ...... 1.8K to 100K Oscillator Timing Capacitor (CT) .... 1nF to 1.0µF Operating Ambient Temperature Range SG1524 ......... -55°C to 125°C SG2524 .. -25°C to 85°C SG3524 ...... 0°C to 70°C
Note 2: Range over which the device is functional and parameter limits are guaranteed.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1524 with -55°C TA 125°C, SG2524 with -25°C TA 85°C, SG3524 with 0°C TA 70°C, and +V IN = 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 (Note 7) Short Circuit Current
Note 3. IL = 0mA
Test Conditions TJ = 25°C VIN = 8V to 40V IL = 0 to 20mA Over Operating Temperature Range Over Line, Load and Temperature VREF = 0V
SG1524/2524 SG3524 Units Min. Typ. Max. Min. Typ. Max. 4.80 5.00 5.20 4.60 5.00 5.40 20 30 50 50 50 50 4.80 5.20 4.60 5.40 25 50 150 25 50 150 V mV mV mV V mA
4/90 Rev 1.1 2/94
Copyright © 1994
2
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1524/SG2524/SG3524
ELECTRICAL CHARACTERISTICS (continued)
Parameter Oscillator Section (Note 4) Initial Accuracy Voltage Stability Maximum Frequency Sawtooth Peak Voltage Sawtooth Valley Voltage Clock Amplitude Clock Pulse Width Error Amplifier Section (Note 5) Input Offset Voltage Input Bias Current Input Offset Current DC Open Loop Gain Output Low Level Output High Level Common Mode Rejection Supply Voltage Rejection Gain-Bandwidth Product (Note 7) P.W.M. Comparator (Note 4) Minimum Duty Cycle Maximum Duty Cycle Test Conditions TJ = 25°C MIN TJ MAX VIN = 8V to 40V RT = 2K, CT = 1nF VIN = 40V VIN = 8V SG1524/2524 SG3524 Units Min. Typ. Max. Min. Typ. Max. 36 34 200 3 0.6 3.2 0.3 40 0.1 400 1 44 46 1 3.8 1.2 1.5 0.5 1 72 3.8 70 55 1 0.2 4.2 0.5 3.8 5 10 1 60 0.2 4.2 0.5 36 34 200 3 0.6 3.2 0.3 40 0.1 400 1 44 46 1 3.8 1.2 1.5 2 1 10 10 2 KHz KHz % KHz V V V µs mV µA µA dB V V dB dB MHz % % mV µA V V µA V V µs µs mA
RS 2K RL 10M, TJ = 25°C VPIN 1 - VPIN 2 150mV VPIN 2 - VPIN 1 150mV VCM = 1.8V to 3.4V VIN = 8V to 40V TJ = 25°C VCOMP = 0.5V VCOMP = 3.6V
2 0
1
2 0
45 190
49 200 210 200 1.2 1.8 50 2
45 180
49 200 220 200 1.2 1.8 50 2
Current Limit Amplifier Section (Note 6) TJ = 25°C Sense Voltage Input Bias Current Shutdown Section Threshold Voltage TJ = 25°C MIN TJ MAX Output Section (each transistor) Collector Leakage Current VCE = 40V Collector Saturation Voltage IC = 50mA Emitter Output Voltage IE = 50mA RC = 2K Collector Voltage Rise Time Collector Voltage Fall Time RC = 2K Power Consumption Standby Current VIN = 40V
Note Note Note Note 4. 5. 6. 7.
0.5 0.2
0.8
0.5 0.2
0.8
17 0.4 0.2 7 10
17 0.4 0.2 7 10
FOSC = 40KHz (R T = 2.9K, CT = .01µF) VCM = 2.5V VCM = 0V These parameters, although guaranteed over the recommended operating conditions, are not 100% tested in production.
4/90 Rev 1.1 2/94
Copyright © 1994
3
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
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