UC2844D ,HIGH PERFORMANCE CURRENT MODE CONTROLLERSOrder this document by UC3844/D* ** * * **HIGH PERFORMANCEThe UC3844, UC3845 series are high perf ..
UC2844D8 ,Current-Mode PWM Controller SLUS223E–APRIL 1997–REVISED JANUARY 20175 Device Comparison TableUVLOTURNON AT 16 V TURNON AT 8.4 ..
UC2844D8 ,Current-Mode PWM ControllerTable of Contents8.4 Device Functional Modes.... 201
UC2844D8 ,Current-Mode PWM ControllerElectrical Characteristics....... 712.4 Trademarks..... 357.6 Typical Characteristics. 912.5 Electr ..
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UC2844D8TR ,Current-Mode PWM ControllerMaximum Ratings.. 612 Device and Documentation Support........ 357.2 ESD Ratings........ 612.1 Rela ..
UM61512AS-15 , 64K X 8 BIT HIGH SPEED CMOS SRAM
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
UC2844D-UC2845N
HIGH PERFORMANCE CURRENT MODE CONTROLLERS
ORDERING INFORMATION
Order this document by UC3844/D- -
The UC3844, UC3845 series are high performance fixed frequency
current mode controllers. They are specifically designed for Off–Line and
dc–to–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 for
50% to 70%.
These devices are available in an 8–pin dual–in–line plastic package as
well as the 14–pin plastic surface mount (SO–14). The SO–14 package has
separate power and ground pins for the totem pole output stage.
The UCX844 has UVLO thresholds of 16 V (on) and 10 V (off), ideally
suited for off–line converters. The UCX845 is tailored for lower voltage
applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off). 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 Input Undervoltage Lockout with Hysteresis Low Startup and Operating Current Direct Interface with Motorola SENSEFET Products
