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UC3842AM Specifications

Detailed technical information and Application Scenarios

Product Details

PartNumberManufactorQuantityAvailability
UC3842AMMSC705Yes

UC3842AM is a current-mode PWM controller manufactured by Microsemi Corporation (MSC).

The UC3842AM is a current-mode PWM controller manufactured by Microsemi Corporation (MSC).

Specifications:

  • Topology: Current-mode PWM control
  • Operating Frequency: Up to 500 kHz
  • Output Drive Current: 1A (peak)
  • Supply Voltage (VCC): 16V (max)
  • UVLO (Undervoltage Lockout): On: 16V (typ), Off: 10V (typ)
  • Duty Cycle Range: 0% to 100%
  • Error Amplifier Bandwidth: 1 MHz (typ)
  • Current Sense Comparator Response Time: 100 ns (typ)
  • Package: 8-Pin SOIC, PDIP

Descriptions:

The UC3842AM is a high-performance fixed-frequency current-mode PWM controller designed for DC-DC converter applications. It features an integrated oscillator, error amplifier, current sensing comparator, and totem-pole output driver. The device is optimized for offline and DC-DC power supplies with precise regulation and protection features.

Features:

  • Current-Mode Operation for improved transient response
  • Automatic Feed-Forward Compensation
  • Latching PWM for cycle-by-cycle current limiting
  • Internal Trimmed Bandgap Reference (5V ±1%)
  • High-Current Totem-Pole Output (1A peak)
  • Undervoltage Lockout (UVLO) with hysteresis
  • Low Startup and Operating Current

This device is commonly used in switch-mode power supplies (SMPS), battery chargers, and industrial power systems.

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