High Power Factor Preregulator The UC3854N is a power factor correction (PFC) controller manufactured by Texas Instruments (formerly Unitrode). Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Manufacturer:** Texas Instruments (UCC)
- **Type:** Power Factor Correction (PFC) Controller
- **Package:** PDIP-16 (Plastic Dual In-Line Package)
- **Operating Temperature Range:** -40°C to +85°C
- **Supply Voltage (VCC):** 15V to 35V
- **Maximum Switching Frequency:** 250 kHz
- **Output Drive Current:** 1A (peak)
- **Reference Voltage:** 7.5V (internal)
- **Power Factor:** >0.99 (typical)
- **Total Harmonic Distortion (THD):** <5% (typical)
### **Descriptions:**
- The UC3854N is designed for high-power, boost-type power factor correction applications.
- It implements average current-mode control to improve power factor and reduce harmonic distortion.
- The IC includes features such as a multiplier, voltage error amplifier, current error amplifier, and oscillator for PFC applications.
- It is commonly used in AC/DC power supplies, industrial equipment, and lighting systems.
### **Features:**
- **Average Current-Mode Control:** Ensures low harmonic distortion.
- **Precision Reference Voltage:** 7.5V with ±1% accuracy.
- **Programmable Oscillator:** Adjustable switching frequency.
- **Soft-Start Function:** Reduces inrush current.
- **Overvoltage Protection (OVP):** Prevents output overvoltage.
- **Undervoltage Lockout (UVLO):** Ensures proper startup.
- **Multiplier for Feedforward Correction:** Maintains consistent performance across varying line voltages.
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.
This information is based on the manufacturer's datasheet and technical documentation.
