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UC3844 - CURRENTMODE PWM CONTROLLER

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

General Description

TheUC3842/3/4/5family of controlICs provides the necessary

Key Features

  • to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal externalparts count. Internallyimplementedcircuits include undervoltagelockout featuring start-up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparatorwhich also providescurrentlimit control,and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel M.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (UC3843_STMicroelectronics.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 SMPS Controller Fairchild Semiconductor
UC3844 PWM controller UMW

Other Datasheets by STMicroelectronics

Part Number Description
UC3844D CURRENTMODE PWM CONTROLLER
UC3844T (UC3842T - UC3845T) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3840 PWM CONTROLLER
UC3842T (UC3842T - UC3845T) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3843 CURRENTMODE PWM 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 ® UC2842/3/4/5 UC3842/3/4/5 CURRENT MODE PWM CONTROLLER . . . . . . . . . . . OPTIMIZED FOR OFF-LINE AND DC TO DC CONVERTERS LOW START-UP CURRENT (< 1 mA) 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 500 KHz OPERATION LOW RO ERROR AMP Minidip SO14 DESCRIPTION TheUC3842/3/4/5family of controlICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal externalparts count.