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UC3842 Datasheet Pwm Controller

Manufacturer: UMW

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

Datasheet Details

Part number UC3842
Manufacturer UMW
File Size 872.14 KB
Description PWM controller
Datasheet UC3842-UMW.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.

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