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UC1845J883B +BOM

Operating Temperature -55 to 125°C

UC1845J883B General Description

UC1845J883B is a control integrated circuit that is part of the UCx84x series and is designed specifically for off-line or DC-to-DC fixed-frequency current-mode control schemes. It offers various internal circuits including undervoltage lockout (UVLO) with low start-up current, a precision trimmed reference for accuracy, logic for latched operation, and a PWM comparator for current-limit control. Additionally, the totem-pole output stage is capable of driving N-channel MOSFETs and is low when in the off state. This series offers a range of package and temperature options, as well as choices for maximum duty cycle and turnon/turnoff thresholds and hysteresis, catering to different application requirements

Key Features

  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1 mA)
  • Automatic feedforward compensation
  • Pulse-by-pulse current limiting
  • Enhanced load-response characteristics
  • Undervoltage lockout with hysteresis
  • Double-pulse suppression
  • High-current totem-pole output
  • Internally trimmed bandgap reference
  • Up to 500-kHz operation
  • Error amplifier with low output resistance

Specifications

Topology Boost, Flyback, Forward Control mode Current
Duty cycle (max) (%) 50 Switching frequency (max) (kHz) 500
Features Error amplifier, Multi-topology UVLO thresholds on/off (V) 8.4/7.6
Operating temperature range (°C) -55 to 125 Rating Military
Gate drive (typ) (A) 1 Vin (max) (V) 30

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