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UC2842 - fixed frequency current mode PWM controller

General Description

The 2842/43/44/45 are fixed frequency current mode PWM controller.

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

Key Features

  • Pin Connection.
  • Low Start-Up and Operating Current.
  • High Current Totem Pole Output.
  • Undervoltage Lockout With Hysteresis.
  • Operating Frequency Up To 500KHz Block diagram (toggle flip flop used only in 2844, 2845) V Top view 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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Datasheet Details

Part number UC2842
Manufacturer UMW
File Size 881.53 KB
Description fixed frequency current mode PWM controller
Datasheet download datasheet UC2842 Datasheet

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Other Datasheets by UMW

Part Number Description
UC2843 fixed frequency current mode PWM controller
UC2844 fixed frequency current mode PWM controller
UC2845 fixed frequency current mode 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.

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UMW R UMW UC2842/43/44/45 Description The 2842/43/44/45 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 2842 and 2844 have UVLO thresholds of 16V (on) and 10V (off). The corresponding thresholds for the 2843/ 45 are 8.4V (on) and 7.6V (off). The 2842 and 2843 can operate within 100% duty cycle.