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UC3845 - HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS

Download the UC3845 datasheet PDF. This datasheet also covers the UC3844 variant, as both devices belong to the same high performance current mode pwm controllers family and are provided as variant models within a single manufacturer datasheet.

Description

The UTC UC3844/3845 are high performance fixed frequency current mode controllers that specifically designed for Off-Line and DC to DC converter applications with minimal external parts count.

The differences between UC3844 and UC3845 are the under-voltage lockout thresholds.

Features

  • S.
  • Operation output switching frequency up to 500 kHz.
  • Automatic feed forward compensation.
  • Latching PWM for cycle-by-cycle current limiting.
  • High current totem pole output.
  • Internally trimmed reference with under voltage lockout.
  • UVLO with hysteresis.
  • Low startup and operating current.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (UC3844_UTC.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

Part Number Description Manufacturer
UC3845 SMPS Controller Fairchild Semiconductor
UC3845 CURRENTMODE PWM CONTROLLER ST Microelectronics
UC3845 High Performance Current Mode Controllers ON Semiconductor
UC3845 Current-Mode PWM Controllers Texas Instruments
UC3845 PWM controller UMW

Other Datasheets by Unisonic Technologies

Part Number Description
UC3842A CURRENT MODE PWM CONTROLLER
UC3842A CURRENT MODE PWM CONTROL CIRCUITS
UC3842B CONTROLLERS
UC3843A CURRENT MODE PWM CONTROLLER
UC3843A CURRENT MODE PWM CONTROL CIRCUITS

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
UNISONIC TECHNOLOGIES CO., LTD UC3844/45 HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS LINEAR INTEGRATED CIRCUIT  DESCRIPTION The UTC UC3844/3845 are high performance fixed frequency current mode controllers that specifically designed for Off-Line and DC to DC converter applications with minimal external parts count. The differences between UC3844 and UC3845 are the under-voltage lockout thresholds. The UC3844 ideally suited to off-line applications with UVLO thresholds of 16V(ON) and 10V(OFF), and UC3845 has UVLO thresholds of 8.4V(ON) and 7.6V(OFF) for lower voltage applications.
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