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UC2843B - HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS

General Description

The UTC UC2843B provides off-line or DC-DC fixed-frequency current-mode control design with minimum external components.

Internally-implemented circuits include an under-voltage lockout (UVLO) and a precision reference with accuracy at the error amplifier input.

Key Features

  • S.
  • Current mode operation:500 kHz.
  • Low start-up current value.

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UNISONIC TECHNOLOGIES CO., LTD UC2843B LINEAR INTEGRATED CIRCUIT HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS  DESCRIPTION The UTC UC2843B provides off-line or DC-DC fixed-frequency current-mode control design with minimum external components. Internally-implemented circuits include an under-voltage lockout (UVLO) and a precision reference with accuracy at the error amplifier input. The UTC UC2843B also contain internal circuits which include a pulse width modulation (PWM) comparator providing current-limit control, logic ensuring latched operation, and a totem-pole output stage designed to source or sink high-peak current. The output stage is low when it is in off-state condition and suitable for N-channel MOSFETs driving.