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UC3843 - PWM controller

This page provides the datasheet information for the UC3843, a member of the UC3842 PWM controller family.

Description

The 3842/43/44/45 are fixed frequency current mode PWM controller.

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

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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Datasheet preview – UC3843

Datasheet Details

Part number UC3843
Manufacturer UMW
File Size 872.14 KB
Description PWM controller
Datasheet download datasheet UC3843 Datasheet
Additional preview pages of the UC3843 datasheet.

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Full PDF Text Transcription

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UMW R UMW UC3842/43/44/45 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. Protection circuitry includes built undervoltage lockout and current limiting. The 3842 and 3844 have UVLO thresholds of 16 V (on) and 10 V (off). The corresponding thresholds for the 3843/ 45 are 8.4V (on) and 7.6V (off). The 3842) and 3843 can operate within 100% duty cycle.
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