SG2524 SG3524 LINEAR INTEGRATED CIRCUITS REGULATING PUL
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SG1524
SG2524
SG3524
LINEAR INTEGRATED CIRCUITS
REGULATING PULSE WIDTH MODULATORS
COMPLETE POWER CONTROL CIRCUITRY
UNCOMMITTED OUTPUTS SINGLE-ENDED PUSH PULL APPLICATIONS
STANDBY CURRENT.,8mA TYPICAL
OPERATION
MAXIMUM TEMPERATURE VARIATION REFERENCE VOLTAGE
polarity, transformer-coupled dc-to-dc converters, transformerless voltage doublers polarity converter applications employing fixed-frequency, pulse-width modulation techniques. dual alternating outputs allows either single-ended push-pull applications. Each device includes on-chip reference, error amplifier, programmable oscillator, pulse-steering flip-flop, uncommitted output transistors, high-gain comparator, current-limiting shut-down circuitry.
SG1524, SG2524, SG3524 incorporate single monolithic chip function required construction regulating power supplies inverters switching regulators. They also used control element high poweroutput applications. SG1524 family designed switching regulators either
ORDERING NUMBERS: SG1524J SG2524J SG3524J (Ceramic) SG2524N-SG3524N (Plastic)
DIP-16 (Plastic Ceramic)
BLOCK DIAGRAM
5/84
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SG2524
SG3524
ABSOLUTE MAXIMUM RATINGS
Ptot 1"stg
Supply voltage Collector output current Reference output current Current through terminal Total power dissipation atTamb Storage temperature range Operating ambient temperature range SG1524
SG2524 SG3524
1000
CONNECTION DIAGRAM
VREF
THERMAL DATA
Rthj-amb Thermal resistance junction-ambient
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SG1524
SG2524
SG3524
ELECTRICAL CHARACTERISTICS (Unless otherwise stated, these specifications apply SG1524, SG2524, SG3524, 20V, 20KHz).
Parameter Test condition 524/SG2524 Min. Typ.l Max. Min. SG3524 Typ.l Max. Unit
REFERENCE SECTION
Vref Output Voltage
VREF Line Regulation
VREF Load Regulation 20mA
Ripple Rejection 120Hz,
Short Circuit Curr. Limit Vref 0,Tj
VREF/ATTemp. Stability Over Operating Temp. Range
AVref Long Term Stability 1000 Hrs.
OSCILLATOR SECTION
'max Maximum Frequency 0.001mF, 2ki2
Initial Accuracy Constant
Voltage Stability 40V,
Af/AT Temperature Stability Over Operating Temp. Range
Output Amplitude
Output Pulse Width 0.01mF,
ERROR AMPLIFIER SECTION
Input Offset Voltage 2.5V
Input Bias Current 2.5V
Open Loop Volt. Gain
Common Mode Volt.
Comm. Mode Rejec.
Small Signal Bandwidth OdB,
Output Voltage
COMPARATOR SECTION
Duty-Cycle Each Output
Input Threshold Zero Duty-Cycle
Input Threshold Maximum Duty-Cycle
Input Bias Current
CURRENT LIMITING SECTION
Sense Voltage with Error Amplifier Max. Out,
Sense Voltage T.C.
Common Mode Volt.
OUTPUT SECTION (Each Output)
Collector-Emitter Volt.
Collector Leackage Cur.
Saturation Voltage 50mA
Emitter Out. Voltage
Rise Time
Fall time 2Kn,
Total Standby Curr.
Excluding oscillator charging current, error current limit dividers, with outputs open.
This Material Copyrighted Respective Manufacturer
SG1524
SG2524
SG3524
Fig. Open-loop voltage amplification error amplifier frequency.
tOOKA '(tun
Re>is iinp*d*nce around.Values wili begin limit duty- cycle. eiow'aOK mini
Fig. Oscillator frequency timing components.
Fig. Output dead time timing capacitance value.
0.001
PRINCIPLES OPERATION
SG1524 fixed-frequency pulse-with-mo-dulation voltage regulator control circuit. regulator operates frequency that programmed timing resistor (Rj) timing capacitor (CT). established constant charging current This results linear voltage ramp which comparator providing linear control output pulse width error amplifier. SG1524 contains, on-board regulator that serves reference well powering SG1524's internal control circuitry also useful supplying external support functions. This reference voltage lowered externally resistor divider provide reference within common-mode
range error amplifier external reference used. power supply output sensed second resistor divider network generale feedback signal error amplifier. amplifier output voltage then compared linear voltage ramp resulting modulated pulse high-gain comparator then steered appropriate output pass transistors pulse-steering flipflop, which synchronously toggled oscillator output. oscillator output pulse also serves blanking pulse assure both outputs never simultaneously during transition times. width blanking pulse controlled value
This Material Copyrighted Respective Manufacturer
SG1524
SG2524
SG3524
outputs applied push-pull configuration which their frequency half that base oscillator, paralleled single-ended applications which frequency equal that oscillator. output error amplifier shares common input comparator with current limiting shutdown circuitry overridden signals from either these inputs. This common point also available externally employed control gain compensate, error amplifier, provide additional control regulator.
RECOMMENDED OPERATING CONDITIONS
Supply voltage
Reference Output Current
Current through Terminal -0.03 to-2
Timing Resistor,
Timing Capacitor, 0.001
TYPICAL APPLICATIONS DATA Oscillator
oscillator controls frequency SG1524 programmed according approximate formula: 1.18
where
Praticai values C-,- fall between 0.001 0.1juF. Praticai values fall between 100Kfl. This results frequency range typically from 120Hz 500KHz.
Fig. Push-pull transformer-coupled circuit.
Blanking
output pulse oscillator used blanking pulse output. This pulse width controlled value O,-. small values required frequency control, oscillator output pulse width still increased applying shunt capacitance 100pF from ground. still greater dead-time required, should accomplished limiting maximum duty cycle clamping output error amplifier. This easily done with circuit below:
Fig.
VREF
1n916 Comp
Synchronous Operation
When external clock desired, clock pulse approximately applied directly oscillator output terminal. impedance ground this point approximately 2KQ,. this configuration C-,- must selected clock period slightly greater than that external clock.
more SG1524 regu lato operated synchronously, oscillator output terminals should tied together, terminals connected single timing capacitor, timing resistor connected single terminal. other terminals left open shorted VREF. Minimum lead lengths should used between terminals.
This Material Copyrighted Respective Manufacturer
SG1524
SG2524
SG3524
Fig. Flyback converter circuit
MECHANICAL DATA (Dimension (Plastic)
10.85*1.65 2.5A 1.27 _1778_
(Ceramic)
952m"
This Material Copyrighted Respective Manufacturer
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