High Power Factor Preregulator The UC3854QTR is a power factor correction (PFC) controller manufactured by Texas Instruments (TI). Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Manufacturer:** Texas Instruments (TI)
- **Part Number:** UC3854QTR
- **Package:** 16-Pin SOIC (Small Outline Integrated Circuit)
- **Operating Temperature Range:** -40°C to +85°C
- **Input Voltage Range:** 15V to 35V (typical)
- **Output Drive Current:** 1.5A (peak)
- **Switching Frequency:** Adjustable (typically up to 500kHz)
- **Control Method:** Average Current Mode Control
- **Power Factor Correction (PFC):** Yes
- **Start-Up Current:** <1mA (typical)
- **Reference Voltage:** 7.5V (precision internal reference)
- **Multiplier Output:** 5V (typical)
- **Current Sense Input Range:** -0.3V to +5V
- **Overvoltage Protection (OVP):** Yes
- **Undervoltage Lockout (UVLO):** Yes (with hysteresis)
### **Descriptions:**
The UC3854QTR is a high-performance PFC controller designed for AC/DC power supplies. It uses average current mode control to achieve near-unity power factor and low harmonic distortion. The device is optimized for boost converter topologies and includes features like soft-start, overvoltage protection, and precision voltage reference for reliable operation.
### **Features:**
- **Average Current Mode Control:** Ensures low harmonic distortion and high power factor.
- **Programmable Switching Frequency:** Allows flexibility in design.
- **Precision Voltage Reference (7.5V):** Ensures stable operation.
- **Low Start-Up Current (<1mA):** Reduces power consumption during initial startup.
- **Integrated Multiplier/Divider Circuit:** Simplifies PFC implementation.
- **Overvoltage Protection (OVP):** Safeguards against excessive output voltage.
- **Undervoltage Lockout (UVLO):** Ensures proper operation under low-voltage conditions.
- **High-Current Totem Pole Output (1.5A):** Directly drives power MOSFETs.
- **Wide Operating Temperature Range (-40°C to +85°C):** Suitable for industrial applications.
This information is based on the manufacturer's datasheet and technical documentation. For detailed application notes and circuit design, refer to the official TI datasheet.
