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The UC3843ADM is a current-mode PWM controller manufactured by Microsemi (formerly a part of Microchip Technology). Below are its key specifications, descriptions, and features:

Specifications

• Manufacturer: Microsemi
• Type: Current-Mode PWM Controller
• Topology: Flyback, Forward, Boost, Buck
• Operating Frequency: Up to 500 kHz
• Duty Cycle Range: 0% to 100%
• Output Current: ±1A (Peak)
• Input Voltage (VCC): 8.4V to 30V
• UVLO (Undervoltage Lockout):
• Startup: 8.4V (Typ)
• Shutdown: 7.6V (Typ)
• Reference Voltage: 5V (±1%)
• Error Amplifier Gain Bandwidth: 1 MHz
• Operating Temperature Range: -40°C to +85°C
• Package: SOIC-8

Descriptions

The UC3843ADM is a fixed-frequency PWM controller optimized for high-performance DC-DC converters. It features current-mode control for improved transient response and simplified loop compensation. The device includes an onboard error amplifier, oscillator, PWM comparator, and a high-current totem-pole output driver.

Features

• Current-Mode Operation for precise control
• Automatic Feed-Forward Compensation
• Latching PWM for cycle-by-cycle current limiting
• Internal Trimmed Reference (5V ±1%)
• Low Startup Current (<1mA)
• High-Current Totem-Pole Output (±1A peak)
• Undervoltage Lockout (UVLO) with hysteresis
• Adjustable Oscillator Frequency via external components

This information is strictly factual and based on the manufacturer's datasheet.