High voltage start-up transition-mode PFC The **L6563H** is a **transition-mode PFC controller** manufactured by **STMicroelectronics (ST)**. Below are its key specifications, descriptions, and features based on factual information from Ic-phoenix technical data files:
### **Specifications:**
- **Input Voltage Range:** Up to **600V** (for high-voltage applications).
- **Operating Frequency:** Adjustable, typically operates in **transition (boundary) mode**.
- **Start-up Current:** **< 50 µA** (low consumption during start-up).
- **Supply Voltage (VCC):** **10.3V to 22V** (operating range).
- **Quiescent Current:** **4 mA** (typical).
- **Output Drive Capability:** **600 mA source / 800 mA sink** (for driving an external MOSFET).
- **Overvoltage Protection (OVP):** Yes (adjustable).
- **Undervoltage Lockout (UVLO):** Yes (ensures proper start-up).
- **Package:** **SO-8** (standard 8-pin small outline package).
### **Descriptions:**
- The **L6563H** is an **enhanced version** of the L6563, optimized for **power factor correction (PFC)** in **AC-DC converters**.
- It operates in **transition mode (TM)**, also known as **critical conduction mode (CrM)**, ensuring high efficiency and low EMI.
- It is designed for **boost PFC pre-regulators** in **SMPS (switched-mode power supplies)**.
### **Features:**
1. **Transition-Mode PFC Operation:** Ensures **near-unity power factor (PF > 0.99)**.
2. **Low Distortion & High Efficiency:** Optimized for **THD (total harmonic distortion) reduction**.
3. **Adjustable Output Overvoltage Protection (OVP):** Protects against excessive output voltage.
4. **Zero-Current Detection (ZCD):** Ensures **valley switching** for reduced switching losses.
5. **Internal Start-up Timer:** Prevents excessive start-up delays.
6. **Multi-Function Pin (Pin 1):** Combines **OVP, feedback voltage sensing, and disable function**.
7. **Enhanced Line Feedforward:** Improves **input voltage regulation**.
8. **Low Standby Power Consumption:** Suitable for **energy-efficient applications**.
This information is strictly based on the manufacturer's datasheet and technical documentation. No additional guidance or suggestions are included.
