Fairchild FSEZ1317NY 6W LED照明驱动解决方案

Fairchild公司的FSEZ1317NY是第三代初级边调整(PSR)和高度集成PWM控制器,待机功耗低于300mW,高压起动,具有最少的外接元件,没有次级反馈电路的恒压(CV)和恒流(CC)控制,PWM固定频率50kHz,主要用在手机,无绳电话,PDA,数码相机等充电器,替代线性变压器和RCC开关电源(SMPS).本文介绍了FSEZ1317主要特性, 功能方框图, 简化PSR反激转换器电路图, 高压起动电路图和6WLED照明驱动器主要特性,电路图和变压器电路图.

FSEZ1317: Primary-Side-Regulation PWM with POWER MOSFET Integrated

This third-generation Primary-Side-Regulation (PSR) and highly integrated PWM controller provides several features to enhance the performance of low-power flyback converters. The proprietary topology, TRUECURRENT™, of FSEZ1317 enables precise CC regulation and simplified circuit design for batterycharger applications. A low-cost, smaller, and lighter charger results, as compared to a conventional design or a linear transformer.

To minimize standby power consumption, the proprietary green mode provides off-time modulation to linearly decrease PWM frequency under light-load conditions. Green mode assists the power supply in meeting power conservation requirements.

By using the FSEZ1317, a charger can be implemented with few external components and minimized cost.

FSEZ1317主要特性:

 Low Standby Power Under 30mW

 High-Voltage Startup

 Fewest External Component Counts

Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary-Feedback Circuitry

 Green-Mode: Linearly Decreasing PWM Frequency

 Fixed PWM Frequency at 50kHz with Frequency Hopping to Solve EMI Problem

 Cable Compensation in CV Mode

 Peak-Current-Mode Control in CV Mode

 Cycle-by-Cycle Current Limiting

 VDD Over-Voltage Protection with Auto Restart

 VDD Under-Voltage Lockout (UVLO)

 Gate Output Maximum Voltage Clamped at 15V

 Fixed Over-Temperature Protection with Auto Restart

 Available in the 7-Lead SOP and DIP Packages

FSEZ1317应用:

 Battery chargers for cELlular phones, cordless phones, PDA, digital cameras, power tools, etc.

 Replaces linear transformers and RCC SMPS

图1. FSEZ1317功能方框图

图2. FSEZ1317简化PSR反激转换器电路图

图3. FSEZ1317高压起动电路图

图4. FSEZ1317典型应用电路图

6WLED照明驱动器

The following reference design supports inclusion of FSEZ1317NY in design ofLEDillumination.

6W LED照明驱动器主要特性:

Constant-Voltage (CV) and Constant-Current (CC) Control without Secondary- Feedback Circuitry

Built in 700V/1A MOSFET

Low EMI through Frequency Hopping

Low Power Consumption in Standby

Protection Functions: UVLO, Over-Voltage, Over-Current, and Over-Temperature

图5. 6W LED照明驱动器电路图

图6. 6W LED照明驱动器变压器电路图