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UC3844 - SMPS Controller

Download the UC3844 datasheet PDF. This datasheet also covers the UC3843 variant, as both devices belong to the same smps controller family and are provided as variant models within a single manufacturer datasheet.

General Description

The UC3842/UC3843/UC3844/UC3845 are fixed frequencycurrent-mode PWM controller.

They are specially designed for Off-Line and DC to DC converter applications with minimum external components.

Key Features

  • Low Start up Current Maximum Duty Clamp UVLO With Hysteresis Operating Frequency up to 500KHz.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (UC3843_FairchildSemiconductor.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

Part Number Description Manufacturer
UC3844 Current-Mode PWM Controllers Texas Instruments
UC3844 HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS UTC
UC3844 High Performance Current-Mode Controller ON Semiconductor
UC3844 CURRENTMODE PWM CONTROLLER STMicroelectronics
UC3844 PWM controller UMW

Other Datasheets by Fairchild (now onsemi)

Part Number Description
UC3844D SMPS Controller
UC3844D1 SMPS Controller
UC3842A SMPS Controller
UC3843 SMPS Controller
UC3843A SMPS Controller

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
www.DataSheet4U.com www.fairchildsemi.com UC3842/UC3843/UC3844/UC3845 SMPS Controller Features • • • • Low Start up Current Maximum Duty Clamp UVLO With Hysteresis Operating Frequency up to 500KHz Description The UC3842/UC3843/UC3844/UC3845 are fixed frequencycurrent-mode PWM controller. They are specially designed for Off-Line and DC to DC converter applications with minimum 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 totempole output for driving a Power MOSFET. The UC3842 and UC3844 have UVLO thresholds of 16V (on) and 10V (off). The UC3843 and UC3845 are 8.5V(on) and 7.9V (off).