Professional IC Distribution & Technical Solutions

The UC3845L is a high-performance current-mode PWM controller manufactured by UTC (Unicorn Microelectronics). Below are its key specifications, descriptions, and features:

Specifications:

• Input Voltage (VCC): 8.5V to 30V
• Operating Frequency: Up to 500kHz
• Output Drive Current: ±1A (peak)
• Duty Cycle Range: 0% to 100% (adjustable)
• Reference Voltage (VREF): 5V (±1%)
• Current Sense Comparator Threshold: 1V
• Low Startup Current: <1mA
• Operating Temperature Range: -40°C to +85°C
• Package Options: DIP-8, SOIC-8

Descriptions:

The UC3845L is a fixed-frequency pulse-width modulation (PWM) controller designed for DC-DC converter and power supply applications. It operates in current-mode control, providing precise regulation and improved loop response. The device includes an oscillator, error amplifier, current sensing comparator, and a totem-pole output stage for driving power MOSFETs.

Features:

• Current-Mode Control: Enhances loop stability and transient response.
• Programmable Oscillator: Adjustable frequency via external timing components.
• Under-Voltage Lockout (UVLO): Ensures proper startup and shutdown.
• Cycle-by-Cycle Current Limiting: Protects against overloads.
• Single-Ended Output: Directly drives power MOSFETs or IGBTs.
• Low Power Consumption: Optimized for efficiency.
• Internal Trimmed Bandgap Reference: Provides stable 5V reference.

This information is strictly factual and based on UTC's official specifications for the UC3845L.