Fairchild公司的FSEZ1317NY是第三代初級邊調(diào)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(shù)碼相機等充電器,替代線性變壓器和RCC開關(guān)電源(SMPS).本文介紹了FSEZ1317主要特性, 功能方框圖, 簡化PSR反激轉(zhuǎn)換器電路圖, 高壓起動電路圖和6W LED照明驅(qū)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(yīng)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(zhuǎn)換器電路圖

圖3. FSEZ1317高壓起動電路圖

圖4. FSEZ1317典型應(yīng)用電路圖

6W LED照明驅(qū)動器

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

6W LED照明驅(qū)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(qū)動器電路圖

圖6. 6W LED照明驅(qū)動器變壓器電路圖