UC3844D1 ,SMPS ControllerBlock Diagram* NORMALLY 8DIP/8SOP PIN NO.* ( ) IS 14SOP PINNO.* TOGGLE FLIP FLOP USED ONLY IN UC384 ..
UC3844D1 ,SMPS Controllerapplications • Operating Frequency up to 500KHz with minimum external components. These integrated ..
UC3844D8 ,Current-Mode PWM ControllerFeaturesThe UCx84x family offers a variety of package• Optimized for Off-Line and DC-to-DC Converte ..
UC3844D8G4 ,Current-Mode PWM Controller 8-SOIC 0 to 70Maximum Ratings.. 612 Device and Documentation Support........ 357.2 ESD Ratings........ 612.1 Rela ..
UC3844D8TR ,Current-Mode PWM ControllerTable of Contents8.4 Device Functional Modes.... 201
UC3844D8TRG4 ,Current-Mode PWM Controller 8-SOIC 0 to 70 SLUS223E–APRIL 1997–REVISED JANUARY 20175 Device Comparison TableUVLOTURNON AT 16 V TURNON AT 8.4 ..
UN2122 ,Composite DeviceElectrical Characteristics T = 25°C ± 3°CaParameter Symbol Conditions Min Typ Max UnitCollector-ba ..
UN2123 ,Composite DeviceFeatures• Costs can be reduced through downsizing of the equipment andreduction of the number of pa ..
UN2123 ,Composite DeviceFeatures• Costs can be reduced through downsizing of the equipment andreduction of the number of pa ..
UN2124 ,Composite DeviceAbsolute Maximum Ratings T = 25°CaR1CParameter Symbol Rating UnitBCollector-base voltage (Emitter ..
UN212X ,Composite DeviceAbsolute Maximum Ratings T = 25°CaR1CParameter Symbol Rating UnitBCollector-base voltage (Emitter ..
UN212Y ,Composite DeviceTransistors with built-in ResistorUNR212x Series (UN212x Series)Silicon PNP epitaxial planar typeUn ..
UC3844D1
SMPS Controller
Features Low Start up Current Maximum Duty Clamp UVLO With Hysteresis Operating Frequency up to 500KHz
DescriptionThe UC3842/UC3843/UC3844/UC3845 are fixed
frequencycurrent-mode PWM controller. They are specially
designed for Off-Line and DC to DC converter applications
with minimum external components. These integrated
circuits feature a trimmed oscillator for precise duty cycle
control, a temperature compensated reference, high gain
error amplifier, current sensing comparator and a high
current totempole output for driving a Power MOSFET. The
UC3842 and UC3844 have UVLO thresholds of 16V (on)
and 10V (off). The UC3843 and UC3845 are 8.5V(on) and
7.9V (off). The UC3842 and UC3843 can operate within
100% duty cycle. The UC3844 and UC3845 can operate
with 50% duty cycle.
