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UC1845J +BOM

Current Mode Control for PWM

UC1845J General Description

The UC1845J is a highly versatile control integrated circuit designed to facilitate off-line or DC-to-DC fixed-frequency current-mode control schemes with minimal external components. It boasts an array of internally implemented circuits, including undervoltage lockout (UVLO) with a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Additionally, it features logic for latched operation, a pulse-width modulation (PWM) comparator with current-limit control, and a totem-pole output stage engineered to source or sink high-peak current. The UC1845J is also compatible with N-channel MOSFETs and ensures a low off-state output. This family of products presents various package and temperature range options, offering a choice of maximum duty cycle, turnon and turnoff thresholds, and hysteresis ranges. With options suited for off-line power supplies and DC-DC applications, the UC1845J devices are specified for operation from –55°C to 125°C. For more moderate temperature requirements, the UC284x series is specified for operation from –40°C to 85°C, while the UC384x series is specified for operation from 0°C to 70°C

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


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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