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UC1843J +BOM

With its advanced design and features, the UC1843J current mode PWM controller provides superior control and regulation for power systems

UC1843J General Description

The UC1843J is a highly versatile voltage mode PWM controller that offers exceptional precision and reliability in regulating power supplies. Its wide input voltage range and adjustable dead time make it ideal for a variety of applications, from offline converters to DC-to-DC converters. The voltage reference with ±1% accuracy ensures stable operation, while the high-current totem pole output stage enables direct driving of power MOSFETs. The built-in soft-start capability minimizes inrush current, enhancing the overall system longevity. With its error amplifier and protection features, such as overcurrent protection and thermal shutdown, the UC1843J provides a comprehensive solution for power supply designs across different electronic devices

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

Application

  • ECONOMICAL OFF-LINE FLYBACK OR FORWARD CONVERTERS.
  • DC-DC BUCK OR BOOST CONVERTERS.
  • LOW COST DC MOTOR CONTROL.

Specifications

Topology Boost, Flyback, Forward Control mode Current
Duty cycle (max) (%) 100 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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In Stock: 6,310

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