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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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