UC3844 Current Mode PWM Controller – Datasheet

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The UC3844 is a fixed frequency current-mode PWM controller. It is specially designed for Off-Line and DC to DC converter applications with minimum external components. This integrated circuit feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, a high gain error amplifier, a current sensing comparator, and a high current totem pole output for driving a Power MOSFET. The UC3844 has UVLO thresholds of 16V (on) and 10V (off). The UC3844 can operate within a 50% duty cycle.

UC3844 Pinout

UC3844 Pin Configuration

Pin NoPin NameDescription
1COMP:Compensation Pin
2VFBFeedBack Voltage Pin
3CURRENT SENSECurrent Sense Pin
4RT/CTResistor/Capacitor Timing Pin
5GNDGround Pin
6OUTPUTOutput Pin
7VCCSupply Voltage
8VrefVoltage Reference Pin

UC3844 Features

  • Low Start up Current
  • Maximum Duty Clamp
  • UVLO With Hysteresis
  • Operating Frequency up to 500KHz
  • Temperature compensated reference
  • High gain amplifier
  • Current sensing comparator
  • High current totem pole output

Application

  • Off-Line
  • DC to DC converter

You can download this datasheet for UC3844 Current Mode PWM Controller – Datasheet from the link given below: