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Home > Semiconductors > Power Management ICs > Switching Converters, Regulators & Controllers > Unitrode UC3844D8 PWM Controller 10V~30V 450kHz 1A SMD SOIC-8

Unitrode UC3844D8 PWM Controller 10V~30V 450kHz 1A SMD SOIC-8

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Quick Overview

Unitrode UC3844D8 IC Converter Offline Boost, Buck, Flyback, Forward Topology Up to 500kHz 8-SOIC

Unitrode UC3844D8 PWM Controller 10V~30V 450kHz 1A SMD SOIC-8

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Unitrode / Texas Instruments UC3844D8, PWM Current Mode Controller, 1 A, 500 kHz 8-Pin SOIC SMD SOIC-8

FEATURES· Optimized For Off-line And To DC Converters Low Start Up Current (<1mA) Automatic Feed Forward Compensation Pulse-by-pulse Current Limiting Enhanced Load Response Characteristics Under-voltage Lockout With Hysteresis Double Pulse Suppression High Current Totem Pole Output Internally Trimmed Bandgap Reference 500khz Operation Low RO Error Amp DESCRIPTION The UC1842/3/4/5 family of control ICs provides the necessary features to implement off-line to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N Channel MOSFETs, is low in the off state. Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC1842 and UC1844 have UVLO thresholds of 16V (on) and 10V (off), ideally suited to off-line applications. The corresponding thresholds for the UC1843 and UC1845 are 8.4V and 7.6V. The UC1842 and UC1843 can operate to duty cycles approaching 100%. A range of zero 50% is obtained by the UC1844 and UC1845 by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.

Flyback Controller, Current Control, UC18/UC28/UC38 Series, Texas Instruments
The isolated-flyback power supply controller provides Constant-Voltage (CV) and Constant-Current (CC) output regulation to improve transient response to large load steps. Primary-Side Regulation (PSR) eliminates the need for an Optocoupler.

Additional Information

Manufacturer: Unitrode (Acquired by Texas Instruments)
Product Category: Switching Controllers
Brand: Unitrode / Texas Instruments
Topology: Buck, Boost, Flyback, Forward
Number of Outputs: 1 Output
Switching Frequency: 450 kHz
Duty Cycle - Max: 50 %
Output Current: 1000 mA
Maximum Operating Temperature: + 70 C
Mounting Style: SMD/SMT
Package / Case: SOIC-8
Rise / Fall Time: 50 ns
Series: UC3844
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