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Part: SG3524P
Category:
Power Management
-> PWM Power Supply
Description: Regulating Pulse Width Modulators
Company: ST Microelectronics, Inc.
Datasheet: Download SG3524P datasheet File size : 1010 kB
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Datasheet text preview:
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SG3524
REGULATING PULSE WIDTH MODULATORS
COMPLETE PWM POWER CONTROL CIRCUITRY UNCOMMITTED OUTPUTS FOR SINGLEENDED OR PUSH PULL APPLICATIONS LOW STANDBY CURRENT 8mA TYPICAL OPERATION UP TO 300KHz 1% MAXIMUM TEMPERATURE VARIATION OF REFERENCE VOLTAGE DESCRIPTION The SG3524 incorporates on a single monolithic chip all the function required for the construction of regulating power suppies inverters or switching regulators. They can also be used as the control element for high power-output applications. The SG3524 family was designed for switching regulators of either polarity, transformer-coupled dcto-dc converters, transformerless voltage doublers and polarity converter applications employing fixed-frequency, pulse-width modulation techniques. The dual alternating outputs allows either single-ended or push-pull applications. BLOCK DIAGRAM
DIP16 SO16
ORDERING NUMBERS: SG3524N (DIP16) SG3524P (SO16)
Each device includes an on-ship reference, error amplifier, programmable oscillator, pulse-steering flip flop, two uncommitted output transistors, a high-gain comparator, and current-limiting and shut-down circuitry.
July 2000
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This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
SG3524
ABSOLUTE MAXIMUM RATINGS
Symbol VIN IC IR IT Ptot Tstg Top Supply Voltage Collector Output Current Reference Output Current Current Through CT Terminal Total Power Dissipation at Tamb = 70°C Storage Temperature Range Operating Ambient Temperature Range: Parameter Value 40 100 50 5 1000 65 to 150 0 to 70 Unit V mA mA mA mW °C °C
PIN CONNECTION (Top view)
THERMAL DATA
Symbol Rth j-amb Rth j-alumina Parameter Thermal Resistance Junction-ambient Thermal Resistance Junction-alumina (*) Max. Max. DIP16 80 SO16 50 Unit °C/W °C/W
(*) Thermal resistance junction-alumina with the device soldered on the middle of an alumina supporting substrate measuring 15 x 20mm; 0.65mm thickness with infinite heatsink.
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SG3524
ELECTRICAL CHARACTERISTICS (unless otherwise stated, these specifications apply for Tj = 0 to 70°C, VIN = 20V, and f = 20KHz).
Symbol VREF VREF VREF Parameter Output Voltage Line Regulation Load Regulation Ripple Rejection VREF/T VREF fMAX Short Circuit Current Limit Temperature Stability Long Term Stability Maximum Frequency Initial Accuracy f/T Voltage Stability Temperature Stability Output Amplitude Output Pulse Width ERROR AMPLIFIER SECTION VOS Ib GV CMV CMR B VO Input Offset Voltage Input Bias Current Open Loop Voltage Gain Common Mode Voltage Common Mode Rejection Small Signal Bandwidth Output Voltage Duty-cycle VIT Input Threshold Tj = 25°C Tj = 25°C AV = 0dB, Tj = 25°C Tj = 25°C % Each Output On Zero Duty-cycle Maximum Duty-cycle VCM = 2.5V 60 1.8 70 3 0.5 0 1 3.5 1 Pin 9 = 2V with Error Amp. Set for Max. Out. Tj = 25°C 180 200 220 3.8 45 2 2 80 10 10 3.4 mV µA dB V dB MHz V % V V µA mV VIN = 8 to 40V IL = 0 to 20mA f = 120Hz, Tj = 25°C VREF = 0, Tj = 25°C Over Operating Temperature range Tj = 125°C, t = 1000Hrs CT = 0.001µF, RT = 2K RT and CT Constant VIN = 8 to 40V, Tj = 25°C Over Operating Temperature Range Pin 3, Tj = 25°C CT = 0.01µF, Tj = 25°C 3.5 0.5 Test Condition Min. 4.6 Typ. 5 10 20 66 100 0.3 20 300 5 1 2 1 Max. 5.4 30 50 Unit V mV mV dB mA % mV KHz % % % V µs REFERENCE SECTION
OSCILLATOR SECTION
COMPARATOR SECTION
Input Bias Current Ib CURRENT LIMITING SECTION Sense Voltage
Sense Voltage T.C. CMV Common Mode Voltage Collector-emitter Voltage Collector Leackage Curr. Saturation Voltage Emitter Output Voltage tr tf Iq (*) Rise Time Fall Time Total Standby Current VCE = 40V IC = 50mA VIN = 20V RC = 2K, Tj = 25°C RC = 2K, Tj = 25°C VIN = 40V 17 1 40 OUTPUT SECTION(each output)
0.2 1
mV/°C
V 0.1 1 18 0.2 0.1 8 10 50 2 µA V V µs µs mA
(*) Excluding oscillator charging current, error and current limit dividers, and with outputs open.
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