LM3524 ,Regulating Pulse Width ModulatorElectrical Characteristics(Note 1)LM2524D LM3524DSymbol Parameter Conditions Tested Design Tested D ..
LM3524DM ,Regulating Pulse Width ModulatorFeaturesbeen raised to 200 mA while reducing V and increasingCEsatn Fully interchangeable with stan ..
LM3524DN ,Regulating Pulse Width ModulatorGeneral DescriptionLM3524D includes double pulse suppression logic that in-The LM3524D family is an ..
LM3524DN/NOPB ,Regulating Pulse Width Modulator 16-PDIP 0 to 80FEATURESThe current carrying capability of the output drive2• Fully Interchangeable With Standard L ..
LM3525AN ,PULSE WIDTH MODULATORElectrical Characteristics
Vin = 20 Vdc, Boldface limits apply from TMIN to TMAX (Note 1), all oth ..
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LM3524
Regulating Pulse Width Modulator
LM2524D/LM3524D
Regulating Pulse Width Modulator
General DescriptionThe LM3524D familyisan improved versionofthe industry
standard LM3524.Ithas improved specificationsand addi-
tional featuresyetispin forpin compatiblewith existing 3524
families. New features reducethe needfor additional exter-
nal circuitry often requiredinthe original version.
The LM3524Dhasa ±1% precision5V reference. Thecur-
rent carrying capabilityofthe output drive transistorshas
been raisedto200 mAwhile reducing VCEsatand increasing
VCE breakdown to60V.The common mode voltagerangeof
the error-amphas been raisedto 5.5Vto eliminatethe need
fora resistive divider fromthe5V reference.the LM3524Dthe circuit biaslinehas been isolated from
the shut-downpin. This preventsthe oscillator pulse ampli-
tude andfrequency from being disturbedby shut-down. Also high frequencies (≅300 kHz)the max. duty cycleperout-
puthas been improvedto 44% comparedto 35% max. duty
cyclein other 3524s. addition,the LM3524Dcan nowbe synchronized exter-
nally, throughpin3. Alsoa latchhas been addedto insure
one pulseper period evenin noisy environments. The
LM3524D includes double pulse suppression logic thatin-
sures whena shut-down conditionis removedthe stateof
the T-flip-flopwill change only afterthefirst clock pulsehas
arrived. This feature preventsthe same output from being
pulsed twiceina row, thus reducingthe possibilityof core
saturationin push-pull designs.
Features Fully interchangeable with standard LM3524 family ±1% precision5V reference with thermal shut-down Output currentto200mADC 60V output capability Wide common mode input rangefor error-amp One pulseper period (noise suppression) Improved max. duty cycleat high frequencies Double pulse suppression Synchronize throughpin3
Block DiagramDS008650-1
June 1999
LM2524D/LM3524D
Regulating
Pulse
idth
Modulator©1999 National Semiconductor Corporation DS008650
