Description

The UC3843AN is a current-mode pulse-width modulation (PWM) controller optimized for switching power supply applications, including offline (AC-DC) and DC-DC converters. It integrates a precision reference, high-gain error amplifier, current sense comparator, PWM latch, and a high-current totem-pole output driver — enabling efficient control of external power switches (e.g., MOSFETs) in a variety of topologies such as buck, boost, fly back, and forward converters.

FEATURES

• Supply Voltage: ~7.6 V to 30 V
• Switching Frequency: Up to ~500 kHz
• Duty Cycle: ~96%
• Under voltage Lockout: On/Off thresholds with hysteresis (nominal ~8.4V/7.6V)
• Output Driver Type: Transistor
• Output Current Capability: High current drive (~1A peak)
• Operating Temp Range: ~0 °C to ~70 °C
• Mounting Style: Through Hole

SPECIFICATION

• Dimension: 9.8 × 6.4 × 4 mm
• Additional information
• Gross weight: 1.2 g
• Manufacturer part number: UC3843AN