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UC2844BN-UC2845BD-UC3844BD1R2-UC3844BVD1R2-UC3844BVN Fast Delivery,Good Price
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UC2844BNONN/a1803avaiHigh Performance Current Mode Controllers
UC2845BDONN/a2500avaiHIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3844BD1R2MOTOR0LAN/a100avaiHigh Performance Current Mode Controller
UC3844BD1R2ONN/a1899avaiHigh Performance Current Mode Controller
UC3844BVD1R2MOTORMLN/a44avaiHigh Performance Current Mode Controller
UC3844BVD1R2MOTN/a44avaiHigh Performance Current Mode Controller
UC3844BVNONN/a139avaiHigh Performance Current Mode Controller


UC2845BD ,HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERThermal CharacteristicsD Suffix, Plastic Package, SOIC−14 Case 751AMaximum Power Dissipation @ T = ..
UC2845BD1013TR ,HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERELECTRICAL CHARACTERISTICS ( [note 1] Unless otherwise stated, these specifications apply for-25 < ..
UC2845BD1013TR ,HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERBLOCK DIAGRAM (toggle flip flop used only in UC3844B and UC3845B)7ViUVLO34V85VVREF5 S/RREF5V 50mAGR ..
UC2845BD1013-TR ,HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Supply Voltage (low impedance source) 30 ViV S ..
UC2845BN ,High performance current mode controllerfeatures consisting of input and referenceN SUFFIXundervoltage lockouts each with hysteresis, cycle ..
UC2845BNG , High Performance Current Mode Controllers
UM621024CV-70L , 128K x 16 CMOS SRAM
UM621024CV-70LL , 128K x 16 CMOS SRAM
UM6264-10 , 8K x 8 CMOS SRAM
UM6264-10L , 8K x 8 CMOS SRAM
UM6264-12 , 8K x 8 CMOS SRAM
UM6264-70L , 8K x 8 CMOS SRAM


UC2844BN-UC2845BD-UC3844BD1R2-UC3844BVD1R2-UC3844BVN
High Performance Current Mode Controller
UC3844B, UC3845B,
UC2844B, UC2845B
High Performance
Current Mode Controllers
The UC3844B, UC3845B 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 an oscillator, 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, a latch for single pulse metering, and a flip−flop
which blanks the output off every other oscillator cycle, allowing
output deadtimes to be programmed from 50% to 70%.
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 UCX844B has UVLO thresholds of 16 V (on) and 10 V (off),
ideally suited for off−line converters. The UCX845B is tailored for
lower voltage applications having UVLO thresholds of 8.5 V (on) and
7.6 V (off).
Features
Pb−Free Packages are Available Trimmed Oscillator for Precise Frequency Control Oscillator Frequency Guaranteed at 250 kHz Current Mode Operation to 500 kHz Output Switching Frequency Output Deadtime Adjustable from 50% to 70% 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
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