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SG2525A

REGULATING PULSE WIDTH MODULATORS

DESCRIPTION TheSG3525Aseriesofpulsewidthmodulatorintegratedcircuitsaredesignedtoofferimprovedperformanceandloweredexternalpartscountwhenusedindesigningalltypesofswitchingpowersupplies.Theon-chip+5.1Vreferenceistrimmedto±1andtheinputcommon-moderangeof

SG2525A

REGULATING PULSE WIDTH MODULATORS

DESCRIPTION TheSG3525Aseriesofpulsewidthmodulatorintegratedcircuitsaredesignedtoofferimprovedperformanceandloweredexternalpartscountwhenusedindesigningalltypesofswitchingpowersupplies.Theon-chip+5.1Vreferenceistrimmedto±1andtheinputcommon-moderangeof

SG2525A

REGULATING PULSE WIDTH MODULATOR

Description TheSG1525A/1527Aseriesofpulsewidthmodulatorintegratedcircuitsaredesignedtoofferimprovedperformanceandlowerexternalpartscountwhenusedtoimplementalltypesofswitchingpowersupplies.Theon-chip+5.1Vreferenceistrimmedto±1initialaccuracyandtheinputco

SG2525A

Voltage Mode PWMs Dual Sink/Source Outputs - 100Hz to 500KHz oscillator range; 8V to 35V Operation\n5.1V Reference Trimmed to ±1%\n100Hz to 500kHz Oscillator Range\nSeparate Oscillator Sync Terminal\nAdjustable Deadtime Control\nInternal Soft-start\nInput Undervoltage Lockout\nLatching P.W.M. to Prevent Multiple Pulses\nDual Source/Sink Output Drivers;

The SG1525A/1527A series of pulse width modulator integrated circuit s are designed to offer improved performance and lower external parts count when used to implement all types of switching power supplies. The? on-chip +5.1 V reference is trimmed to ±1% initial accuracy and the input common-mode range of the error amplifier includes the reference voltage, eliminating external potentiometers and? divider resistors. A Sync input to the oscillator allows multiple units to be slaved together, or a single unit to be synchronized to an external system clock. A single resistor between the CT pin and the D is charge pin provides a wide range of deadtime adjustment. These devices also feature built-in soft-start circuitry with only a timing capacitor required externally. A Shutdown pin controls both the soft -start circuitry and the output stages, providing instantaneous turn-off with soft-start recycle for slow turn-on. These functions are also controlled by an under voltage lockout which keeps the outputs o ff and the soft-start capacitor discharged for input voltages less than that required for normal operation. Another unique feature of these PWM circuits is a latch following the comparator. Once a? PWM pulse has been terminated for any reason, the outputs remain off for the duration of the period. The latch is reset with each clock pulse. The output stages are totem-pole designs capable of sourcing or sinking in excess of 200mA. The SG1525A output stage features NOR logic, giving a LOW output for an OFF? state. The SG1527A utilizes OR logic, which results in a HIGH output level when OFF

SG2525A

REGULATING PULSE WIDTH MODULATORS;

SG2525A

REGULATING PULSE WIDTH MODULATOR

SG2525A

REGULATING PULSE WIDTH MODULATORS

SG2525ADW

REGULATING PULSE WIDTH MODULATOR

Description TheSG1525A/1527Aseriesofpulsewidthmodulatorintegratedcircuitsaredesignedtoofferimprovedperformanceandlowerexternalpartscountwhenusedtoimplementalltypesofswitchingpowersupplies.Theon-chip+5.1Vreferenceistrimmedto±1initialaccuracyandtheinputco

SG2525AJ

REGULATING PULSE WIDTH MODULATOR

Description TheSG1525A/1527Aseriesofpulsewidthmodulatorintegratedcircuitsaredesignedtoofferimprovedperformanceandlowerexternalpartscountwhenusedtoimplementalltypesofswitchingpowersupplies.Theon-chip+5.1Vreferenceistrimmedto±1initialaccuracyandtheinputco

SG2525AJ

High-Reliability Power Management; ·8V to 35V operation\n·5.1V reference trimmed to ±1%\n·100Hz to 500KHz oscillator range\n·Separate oscillator sync terminal\n·Adjustable dead-time control\n·Internal soft-start\n·Input under-voltage lockout\n·Latching P.W.M. to prevent multiple pulses\n·Dual source/sink output drivers\n;

The SG1525A/1527A series of pulse width modulator integrated circuits are designed to offer improved performance and lower external parts count when used to implement all types of switching power supplies. The on-chip +5.1 volt reference is trimmed to ±1% initial accuracy and the input common-mode range of the error amplifier includes the reference voltage, eliminating external potentiometers and divider resistors. A Sync input to the oscillator allows multiple units to be slaved together, or a single unit to be synchronized to an external system clock. A single resistor between the CT pin and the Discharge pin provides a wide range of dead-time adjustment. These devices also feature built-in soft-start circuitry with only a timing capacitor required externally. A Shutdown pin controls both the soft-start circuitry and the output stages, providing instantaneous turn-off with soft-start recycle for slow turn-on. These functions are also controlled by an under-voltage lockout which keeps the outputs off and the soft-start capacitor discharged for input voltages less than that required for normal operation. Another unique feature of these PWM circuits is a latch following the comparator. Once a PWM pulse has been terminated for any reason, the outputs will remain off for the duration of the period. The latch is reset with each clock pulse. The output stages are totem-pole designs capable of sourcing or sinking in excess of 200mA. The SG1525A output stage features NOR logic, giving a LOW output for an OFF state. The SG1527A utilizes OR logic which results in a HIGH output level when OFF.