UC2578DPTR ,Buck Pulse Width Modulator Stepdown Voltage RegulatorELECTRICAL CHARACTERISTICS: Unless otherwise specified VCC = 14V, VGG = 14V, T =T .A JPARAMETER TES ..
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UC2578DP-UC2578DPTR
Buck Pulse Width Modulator Stepdown Voltage Regulator
UC2578
UC3578
FEATURES Provides Simple Single Inductor Buck
PWM Step-Down Voltage Regulation Drives External High Side NMOS
Switch 14V to 72V Input Voltage Operating
Range Contains 100kHz Internal Oscillator,
2V Reference and UVLO Soft Start on Power Up Overcurrent Shutdown Followed by
Soft Start
Buck Pulse Width Modulator Stepdown Voltage Regulator
TYPICAL APPLICATION DIAGRAM
DESCRIPTIONThe UC3578isa PWM controller withan integrated high side floating gate
driver.Itis usedin buck step down converters and regulatesa positive
output voltage. Intendedto be usedina distributed power system, theIC
allows operation from 14Vto 72V input voltage which range includes the
prevalent telecomm bus voltages. The output duty cycleof the UC3578
can vary between 0% and 90% for operation over the wide input voltage
and load conditions.
The UC3578 simplifies the designof the single switch PWM buck converter incorporatinga floating high side driver for an external N-channel
MOSFET switch.It also featuresa 100kHz fixed frequency oscillator, an
internal 2V precision reference, an error amplifier configured for voltage
mode operation, anda PWM comparator with latching logic. Comple-
menting the traditional voltage mode control block, the UC3578 incorpo-
ratesan overcurrent shutdown circuit with full cycle soft re-startto limit the
input currenttoa user defined maximum value during overload operation.
Additional functions include an under voltage lockout circuitto insure that
sufficient input supply voltageis present before any switching activity can
occur.
The UC2578 and the UC3578 are both availablein surface mount and
thru-hole power packages.
TEMPERATURE RANGE PACKAGEUC2578DP –40°C to +85°C Power SOIC
UC2578N Power PDIP
UC3578DP 0°C to +70°C Power SOIC
UC3578N Power PDIP
ORDERING INFORMATIONNot Recommended for New Designs
