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UC3843 - PWM controller

Download the UC3843 datasheet PDF. This datasheet also covers the UC3842 variant, as both devices belong to the same pwm controller family and are provided as variant models within a single manufacturer datasheet.

General Description

The 3842/43/44/45 are fixed frequency current mode PWM controller.

Line and DC to DC converter applications with a minimal external components.

Key Features

  • Low Start-Up and Operating Current.
  • High Current Totem Pole Output.
  • Undervoltage Lockout With Hysteresis.
  • Operating Frequency Up To 500KHz Pin Connection Block diagram (toggle flip flop used only in 3844, 3845) Top view V R T Absolute Maximum Ratings Symbol Parameter VCC IO VI ISINK (E. A) Po Tstg TL TA Supply Voltage (low impedance source) Output Current Input Voltage (Analog Inputs pins 2,3) Error Amp Output Sink Current Power Dissipation (TA=250C.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (UC3842-UMW.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number UC3843
Manufacturer UMW
File Size 872.14 KB
Description PWM controller
Datasheet download datasheet UC3843 Datasheet

📁 Similar Datasheet

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UC3843 Current-Mode PWM Controllers Texas Instruments
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UC3843 SMPS Controller Fairchild Semiconductor
UC3843 Fixed Frequency Current Mode PWM Controller ChipsWinner
UC3843 High Performance Current Mode Controller HOTCHIP

Other Datasheets by UMW

Part Number Description
UC3842 PWM controller
UC3844 PWM controller
UC3845 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
UMW R UMW UC3842/43/44/45 Description The 3842/43/44/45 are fixed frequency current mode PWM controller. They are specially designed for OFF−Line and DC to DC converter applications with a minimal external components. Internally implemented circuits include 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 ideally suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout and current limiting. The 3842 and 3844 have UVLO thresholds of 16 V (on) and 10 V (off). The corresponding thresholds for the 3843/ 45 are 8.4V (on) and 7.6V (off). The 3842) and 3843 can operate within 100% duty cycle.