關鍵詞： Fairchild , FSEZ1317NY , LED照明驅動

Fairchild公司的FSEZ1317NY是第三代初級邊調整(PSR)和高度集成PWM控制器,待機功耗低于300mW,高壓起動,具有最少的外接元件,沒有次級反饋電路的恒壓(CV)和恒流(CC)控制,PWM固定頻率50kHz,主要用在手機,無繩電話,PDA,數碼相機等充電器,替代線性變壓器和RCC開關電源(SMPS).本文介紹了FSEZ1317主要特性, 功能方框圖, 簡化PSR反激轉換器電路圖, 高壓起動電路圖和6W LED照明驅動器主要特性,電路圖和變壓器電路圖.

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應用:

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

 Replaces linear transformers and RCC SMPS

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圖1. FSEZ1317功能方框圖

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圖2. FSEZ1317簡化PSR反激轉換器電路圖

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圖3. FSEZ1317高壓起動電路圖

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圖4. FSEZ1317典型應用電路圖

6W LED照明驅動器

The following reference design supports inclusion of FSEZ1317NY in design of LED illumination.

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6W LED照明驅動器主要特性:

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

2011-11-30 11:29:18 上傳

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