POWER FACTOR CONTROLLERS The MC33261 is a power factor controller (PFC) IC manufactured by ON Semiconductor (formerly part of Motorola). Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:
### **Manufacturer:**
ON Semiconductor (formerly Motorola)
### **Specifications:**
- **Type:** Power Factor Controller (PFC)
- **Operating Voltage Range:** 8.5V to 18V
- **Start-Up Current:** 150µA (typical)
- **Operating Current:** 4mA (typical)
- **Output Drive Current:** ±500mA (peak)
- **Switching Frequency:** Adjustable (typically up to 250kHz)
- **Error Amplifier Bandwidth:** 1MHz (typical)
- **Multiplier Bandwidth:** 1MHz (typical)
- **Operating Temperature Range:** -40°C to +105°C
- **Package Options:** SOIC-8, DIP-8
### **Descriptions:**
- The MC33261 is designed for boost-type power factor correction (PFC) applications.
- It operates in critical conduction mode (transition mode) to improve power factor in AC/DC power supplies.
- The IC includes a transconductance error amplifier, a precision multiplier, a zero-current detector, and a high-current output driver.
### **Features:**
- **Power Factor Correction (PFC):** Ensures near-unity power factor in AC input systems.
- **Low Start-Up Current:** Enables efficient operation at low power.
- **Internal Start-Up Timer:** Prevents excessive start-up delays.
- **Zero-Current Detection:** Ensures operation in critical conduction mode.
- **Overvoltage Protection (OVP):** Protects against output voltage surges.
- **Undervoltage Lockout (UVLO):** Ensures proper operation within voltage range.
- **Multiplier for Input Current Shaping:** Maintains sinusoidal input current.
This information is based on the manufacturer's datasheet and technical documentation.
