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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 
圖1. FSEZ1317功能方框圖
圖2. FSEZ1317簡化PSR反激轉換器電路圖
圖3. FSEZ1317高壓起動電路圖
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.
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
圖5. 6W LED照明驅動器電路圖
圖6. 6W LED照明驅動器變壓器電路圖 詳情請見: 
FSEZ1317.pdf
(946.42 KB)
RD-L007.pdf
(210.21 KB)
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