UC3844, UC3842 - PWM controller

The UC3844 by UMW is a PWM controller. Below is the official datasheet preview.

Datasheet Details

Part number	UC3844, UC3842
Manufacturer	UMW
File Size	872.14 KB
Description	PWM controller
Datasheet	UC3842-UMW.pdf
Note	This datasheet PDF includes multiple part numbers: UC3844, UC3842. Please refer to the document for exact specifications by model.
Additional preview pages of the UC3844 datasheet.

The 3842/43/44/45 are fixed frequency current mode PWM controller. Line and DC to DC converter applications with a minimal external components.

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.

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Published: Aug 18, 2025 |