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L6569A from ST,ST Microelectronics

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L6569A

Manufacturer: ST

HIGH VOLTAGE HALF BRIDGE DRIVER WITH OSCILLATOR

Partnumber Manufacturer Quantity Availability
L6569A ST 1990 In Stock

Description and Introduction

HIGH VOLTAGE HALF BRIDGE DRIVER WITH OSCILLATOR The L6569A is a current-mode primary controller IC manufactured by STMicroelectronics, designed for offline flyback converters. Below are its key specifications, descriptions, and features:

### **Specifications:**  
- **Input Voltage Range:** Up to 600V (high-voltage startup)  
- **Operating Frequency:** Adjustable up to 300 kHz  
- **Output Power:** Up to 15W in DIP-8 package (depending on design)  
- **Startup Current:** < 50 µA  
- **Quiescent Current:** < 3 mA  
- **Peak Driving Current:** ±400 mA (for MOSFET gate drive)  
- **Protections:** Overvoltage (OVP), overload (OLP), undervoltage lockout (UVLO)  

### **Description:**  
The L6569A is a PWM controller optimized for quasi-resonant (QR) operation in flyback converters, improving efficiency by enabling valley switching. It includes a high-voltage startup circuit, reducing external component count. It operates in transition mode (TM) for power factor correction (PFC) applications.  

### **Features:**  
- **Quasi-Resonant Operation:** Reduces switching losses by enabling zero-voltage switching (ZVS).  
- **Current-Mode Control:** Ensures cycle-by-cycle current limiting.  
- **Adjustable Frequency:** External resistor sets maximum switching frequency.  
- **Line Voltage Feedforward:** Improves input regulation.  
- **Soft Start:** Reduces inrush current.  
- **Latched or Auto-Recovery Protections:** Configurable for OVP/OLP.  
- **Low Power Consumption:** Enhances efficiency in standby mode.  

The L6569A is commonly used in AC/DC adapters, LED drivers, and auxiliary power supplies.  

(Source: STMicroelectronics datasheet)

Application Scenarios & Design Considerations

HIGH VOLTAGE HALF BRIDGE DRIVER WITH OSCILLATOR

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