UC3847DW ,Current Mode PWM ControllerMaximum Ratings(1)over operating free-air temperature range (unless otherwise noted)MIN MAX UNITSup ..
UC3847J ,Current Mode PWM Controller SLUS352C–JANUARY 1997–REVISED DECEMBER 20155 Pin Configuration and FunctionsJ or N, DW Packages16- ..
UC3848N , Average Current Mode PWM Controller
UC3851DW ,Programmable, Off-Line, PWM ControllerUC1851UC2851UC3851Programmable, Off-Line, PWM Controller
UC3851N ,Programmable, Off-Line, PWM ControllerMAXIMUM RATINGS (Note 1)Supply Voltage, +VIN (Pin 15) Comparator Inputs Voltage Driven . . . . ..
UC3851N ,Programmable, Off-Line, PWM Controllerfeatures of these controllers include low currentstart-up, linear feed-forward for constant volt-se ..
UN4119 ,Composite DeviceFeatures•Costs can be reduced through downsizing of the equipment andreduction of the number of par ..
UN411D ,Composite DeviceTransistors with built-in ResistorUNR411x Series (UN411x Series)Silicon PNP epitaxial planar typeUn ..
UN411H ,Composite DeviceFeatures•Costs can be reduced through downsizing of the equipment andreduction of the number of par ..
UN411L ,Composite DeviceFeatures•Costs can be reduced through downsizing of the equipment andreduction of the number of par ..
UN4121 ,Composite DeviceElectrical Characteristics T = 25°C ± 3°CaParameter Symbol Conditions Min Typ Max UnitCollector-ba ..
UN4122 ,Composite DeviceFeatures0.75 max.• Costs can be reduced through downsizing of the equipment andreduction of the num ..
UC3847DW-UC3847J
Current Mode PWM Controller
VREF
+E/A
-E/A
AOUT
C/S+
BOUT
C/S-
UCX846
VIN
.1µF
180
68
.05µF
68
2N4150
.5Q
1N4245
1N4245
1N4245
UES1402
UES1402
300µF
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UC1846, UC1847, UC2846
UC2847, UC3846, UC3847SLUS352C –JANUARY 1997–REVISED DECEMBER 2015
UCx846/7 Current Mode PWM Controller Features 3 DescriptionThe UC1846/7 familyof control devices providesall Automatic Feedforward Compensation of the necessary features to implement fixed-• Programmable Pulse-by-Pulse Current Limiting frequency, current-mode control schemes while• Automatic Symmetry Correctionin Push-Pull maintaininga minimum external parts count. The
Configuration superior performance of this technique can be
measuredin improved line regulation, enhanced load• Enhanced Load Response Characteristics response characteristics, anda simpler, easier-to-• Parallel Operation Capabilityfor Modular Power design control loop. Topological advantages includeSystems inherent pulse-by-pulse current limiting capability, Differential Current Sense Amplifier with Wide automatic symmetry correction for push-pull
Common Mode Range converters, and the abilityto parallel power modules
while maintaining equal current sharing.• Double-Pulse Suppression
Protection circuitry includes built-in undervoltage• 500-mA (Peak) Totem-pole Outputs
lockout and programmable current limit,in additionto• ±1% Band Gap Reference soft-start capability.A shutdown function is also• Undervoltage Lockout available, which can initiate either a complete Soft-Start Capability shutdown with automatic restartor latch the supply
off.• Shutdown Terminal 500-kHz Operation Other features include fully-latched operation, double-
pulse suppression, deadline adjust capability, anda
±1% trimmed band gap reference.
2 ApplicationsThe UC1846 features low outputsin the OFF state,• Telecommunication Power Converters
while the UCx847 features high outputsin the OFF• Industrial Power Converters state.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe datasheet.
Block Diagram
