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L6566B from ST,ST Microelectronics

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L6566B

Manufacturer: ST, STM

Multi-mode controller for SMPS

Partnumber Manufacturer Quantity Availability
L6566B ST, STM 7260 In Stock

Description and Introduction

Multi-mode controller for SMPS The L6566B is a current-mode primary controller IC manufactured by STMicroelectronics. Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:

### **Specifications:**  
- **Input Voltage Range (VCC):** 8.5V to 21V  
- **Operating Frequency:** Adjustable up to 300kHz  
- **Maximum Duty Cycle:** 50%  
- **Start-up Current:** 50µA (typical)  
- **Quiescent Current:** 3mA (typical)  
- **Output Drive Capability:** ±500mA (source/sink)  
- **Protection Features:**  
  - Overvoltage Protection (OVP)  
  - Overload Protection (OLP)  
  - Undervoltage Lockout (UVLO)  
  - Thermal Shutdown  

### **Description:**  
The L6566B is a high-performance, fixed-frequency current-mode PWM controller designed for offline flyback converters. It is optimized for applications requiring high efficiency and low standby power, such as AC-DC adapters and LED drivers. The IC integrates multiple protection features and operates in quasi-resonant mode for improved efficiency.

### **Features:**  
- **Quasi-Resonant Operation:** Reduces switching losses for higher efficiency.  
- **Adjustable Frequency:** Up to 300kHz for flexibility in design.  
- **Current-Mode Control:** Ensures stable operation and fast transient response.  
- **Low Standby Power:** Supports energy-saving applications.  
- **Integrated Protections:** Includes OVP, OLP, UVLO, and thermal shutdown.  
- **Soft-Start:** Minimizes inrush current during startup.  
- **Latch or Auto-Recovery Mode:** Configurable fault management.  

This information is based solely on the manufacturer's datasheet for the L6566B.

Application Scenarios & Design Considerations

Multi-mode controller for SMPS

Alternative Part Number

  • NCP1252ADR2G --: Current-mode PWM controller with comparable function and pinout flexibility, widely available and cost-effective substitute for offline flyback designs.
  • UC3845BN --: Classic industry-standard current-mode PWM controller, well documented and broadly used as a functional replacement in SMPS applications.
  • SG6848DZ --: Green-mode PWM controller for offline power supplies, offering similar control features and a common alternative for L6566B-based designs.
  • NCP1252 --: Current-mode PWM controller for offline flyback converters with comparable functionality and pinout flexibility, widely available and cost-effective.
  • UC3845 --: Industry-standard current-mode PWM controller offering similar control loop behavior, very mature and broadly sourced as a fallback.
  • ICE3BR0665J --: Integrated offline flyback controller with built-in protection features, suitable as a functional substitute in SMPS designs with minor circuit adjustment.

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