BiCMOS Power Factor Preregulator The UCC3818AN is a BiCMOS power factor correction (PFC) controller manufactured by UNITRODE. Below are its specifications, descriptions, and features based on factual information from Ic-phoenix technical data files:
### **Specifications:**
- **Manufacturer:** UNITRODE (now part of Texas Instruments)
- **Type:** Average Current Mode PFC Controller
- **Package:** 8-Pin PDIP (Plastic Dual Inline Package)
- **Operating Voltage Range:** 10V to 17V (recommended)
- **Maximum Supply Voltage:** 18V (absolute max)
- **Operating Temperature Range:** -40°C to +85°C
- **Switching Frequency:** Programmable (up to 250kHz)
- **Peak Output Current:** ±1.5A (gate drive)
- **Control Method:** Average Current Mode Control
- **Power Factor Correction:** >0.99 (typical)
- **Total Harmonic Distortion (THD):** <5% (typical)
### **Descriptions:**
The UCC3818AN is designed for high-performance power factor correction in AC/DC power supplies. It operates in continuous conduction mode (CCM) and uses average current mode control to regulate the input current waveform, ensuring compliance with harmonic standards (such as IEC 61000-3-2).
### **Features:**
- **Average Current Mode Control:** Provides low distortion and high power factor.
- **Programmable Oscillator:** Allows adjustment of switching frequency.
- **Soft-Start Function:** Reduces inrush current during startup.
- **Overvoltage Protection (OVP):** Safeguards against output overvoltage.
- **Undervoltage Lockout (UVLO):** Ensures proper operation within voltage limits.
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.
- **Low Start-Up Current:** Reduces power consumption during standby.
- **Precision Reference Voltage:** 7.5V with ±1% accuracy.
This information is based solely on the manufacturer's datasheet and technical documentation.
