UC3845 Datasheet Pwm Controller

Manufacturer: UMW

Overview: UMW R UMW UC3842/43/44/45.

This datasheet includes multiple variants, all published together in a single manufacturer document.

Datasheet Details

Part number	UC3845
Manufacturer	UMW
File Size	872.14 KB
Description	PWM controller
Datasheet	UC3845 UC3842 Datasheet (PDF)

General 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.

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.

UC3845 Distributor

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More Datasheets from UMW

Part Number	Description
UC3842	PWM controller
UC3843	PWM controller
UC3844	PWM controller