UC3843BVD ,High Performance Current Mode ControllerFeaturesCompensation 1 8 V• Trimmed Oscillator for Precise Frequency Control ref2 7Voltage Feedback ..
UC3843BVD ,High Performance Current Mode ControllerMAXIMUM RATINGSRating Symbol Value UnitBias and Driver Voltages (Zero Series Impedance, see also To ..
UC3843BVD ,High Performance Current Mode ControllerThermal CharacteristicsD Suffix, Plastic Package, SO–14 Case 751AMaximum Power Dissipation @ T = 25 ..
UC3843BVD1R2 ,High Performance Current Mode ControllerThermal CharacteristicsD Suffix, Plastic Package, SOIC−14 Case 751AMaximum Power Dissipation @ T = ..
UC3843BVN ,High Performance Current Mode ControllerMaximum ratings applied to the device are individual stress limitvalues (not normal operating condi ..
UC3843D ,SMPS ControllerTable of Contents8.4 Device Functional Modes.... 201
UN11015 ,Circuit Protector DevicesElectrical Characteristics T = 25°C ± 3°Ca100Parameter Min Typ Max UnitRated voltage 50 V10Rated c ..
UN1113 ,Composite DeviceAbsolute Maximum Ratings T = 25°CaParameter Symbol Rating UnitCollector-base voltage (Emitter open ..
UN1115 ,Composite DeviceTransistors with built-in ResistorUNR111x Series (UN111x Series)Silicon PNP epitaxial planar transi ..
UN1122 ,Composite DeviceFeaturesR 0.9Costs can be reduced through downsizing of the equipment andR 0.7reduction of the nu ..
UN1210 ,Composite DeviceAbsolute Maximum Ratings T = 25°CaParameter Symbol Rating UnitCollector-base voltage (Emitter open ..
UN1213 ,Composite DeviceFeaturesR 0.9•Costs can be reduced through downsizing of the equipment andR 0.7reduction of the num ..
UC2842BD-UC3842B-UC3843BD-UC3843BD1R2-UC3843BN-UC3843BVD-UC3843BVD1R2-UC3843BVN
High Performance Current Mode Controller
UC3842B, UC3843B,
UC2842B, UC2843B,
NCV3843BV
High Performance
Current Mode Controllers
The UC3842B, UC3843B series are high performance fixed
frequency current mode controllers. They are specifically designed for
Off−Line and DC−DC converter applications offering the designer a
cost−effective solution with minimal 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 totem pole
output ideally suited for driving a power MOSFET.
Also included are protective features consisting of input and
reference undervoltage lockouts each with hysteresis, cycle−by−cycle
current limiting, programmable output deadtime, and a latch for single
pulse metering.
These devices are available in an 8−pin dual−in−line and surface
mount (SOIC−8) plastic package as well as the 14−pin plastic surface
mount (SOIC−14). The SOIC−14 package has separate power and
ground pins for the totem pole output stage.
The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off),
ideally suited for off−line converters. The UCX843B is tailored for
lower voltage applications having UVLO thresholds of 8.5 V (on) and
7.6 V (off).
Features Trimmed Oscillator for Precise Frequency Control Oscillator Frequency Guaranteed at 250 kHz Current Mode Operation to 500 kHz Automatic Feed Forward Compensation Latching PWM for Cycle−By−Cycle Current Limiting Internally Trimmed Reference with Undervoltage Lockout High Current Totem Pole Output Undervoltage Lockout with Hysteresis Low Startup and Operating Current Pb−Free Packages are Available
Power
Ground
Current
Sense
Input
Vref
8(14)
4(7)
2(3)
1(1)
RT/CT
Voltage
Feedback
Input
Output
Compensation
