UC3844 ,SMPS ControllerUC3842/UC3843/UC3844/UC3845SMPS Controller
UC3844A ,HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERUC284XAUC384XAHIGH PERFORMANCE CURRENT MODE PWM CONTROLLERNOT FOR NEW DESIGN1
UC3844AD ,Current Mode PWMsBLOCK DIAGRAM (toggle flip flop used only in UC3844A and UC3845A)7ViUVLO34V85VVREF5 S/RREF5V 50mAGR ..
UC3844AD1 ,HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERapplications Thea precision reference trimmed for accuracy at thecorresponding thresholds for the U ..
UC3844AD1013TR ,HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERFEATURESFigure 1. Package■ TRIMMED OSCILLATOR DISCHARGE CURRENT■ CURRENT MODE OPERATION TO 500kHz A ..
UC3844AM , CURRENT MODE PWM CONTROLLER
UN2113 ,Composite DeviceFeatures• Costs can be reduced through downsizing of the equipment andreduction of the number of pa ..
UN2114 ,Composite DeviceFeatures• Costs can be reduced through downsizing of the equipment andreduction of the number of pa ..
UN2115 ,Composite DeviceAbsolute Maximum Ratings T = 25°CaParameter Symbol Rating UnitCollector-base voltage (Emitter open ..
UN2115- ,Composite DeviceAbsolute Maximum Ratings T = 25°CaParameter Symbol Rating UnitCollector-base voltage (Emitter open ..
UN2116 ,Composite DeviceAbsolute Maximum Ratings T = 25°CaParameter Symbol Rating UnitCollector-base voltage (Emitter open ..
UN2117 ,Composite DeviceElectrical Characteristics T = 25°C ± 3°CaParameter Symbol Conditions Min Typ Max UnitCollector-ba ..
UC3844
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.
