Fairchild公司的FL7730MY是單級初級邊調(diào)整的PWM控制器,為單級反激轉(zhuǎn)換器提供了增強(qiáng)性能,采用的TRUECURRENT™拓?fù)淠芎喕疞ED照明應(yīng)用的電路設(shè)計(jì),從而降低成本,提高了功率因素,降低總諧波失真.起動(dòng)電流20uA,工作電流5mA,主要于LED照明.本文介紹了FL7730MY主要特性,方框圖, 輸入電壓90-140VAC的TRIAC調(diào)光LED驅(qū)動(dòng)電路圖以及90V-264VAC的評估板5.0V/0.7A手機(jī)電池充電器主要指標(biāo),電路圖,材料清單和PCB布局圖.
FL7730MY:Single-Stage Primary-Side-Regulation PWM Controller for PFC and LED Dimmable Driving
This highly integrated PWM controller, FL7730MY, provides several features to enhance the performance of single-stage flyback converters. The proprietary topology, TRUECURRENT™, enables the simplified circuit design for LED lighting applications.
TRIAC dimming is smoothly managed by dimming brightness control without flicker. By using single-stage topology with primary-side regulation, an LED lighting board can be implemented with few external components and minimized cost. It does not require an input bulk capacitor or feedback circuitry. To implement good power factor and low total harmonic distortion, constant on-time control is utilized with an external capacitor connected to the COMI pin.
Precise constant-current control regulates accurate output current versus changes in input voltage and output voltage. The operating frequency is proportionally changed by the output voltage to guarantee Discontinuous Conduction Mode (DCM) operation with higher efficiency and simpler design. The FL7730MY provides protections such as open-LED, short-LED, and over-temperature protections. Current-limit level is automatically reduced to minimize output current and protect external components in a short-LED condition.
The FL7730MY frequency-hopping function in the oscillator improves EMI performance. The FL7730MY controller is available in an 8-pin SOP package.
FL7730MY主要特性:
Compatible with Traditional TRIAC Control (No need to change existing lamp infrastructure: wall switch & wire)
Compatible with Non-Dimming Lamp Designs
Cost-Effective Solution without Input Bulk Capacitor and Feedback Circuitry
Power Factor Correction (PFC)
Accurate Constant-Current (CC) Control, Independent Online Voltage, Output Voltage,Magnetizing Inductance Variation
Line Voltage Compensation for CC Control
Linear Frequency Control for Better Efficiency and Simple Design
Open-LED Protection
Short-LED Protection
Cycle-by-Cycle Current Limiting
Over-Temperature Protection with Auto Restart
Low Startup Current: 20μA
Low Operating Current: 5mA
Frequency Hopping for Better EMI Performance
SOP-8 Package Available
FL7730MY應(yīng)用:
LED Lighting System
圖1.FL7730MY方框圖
圖2.FL7730MY TRIAC調(diào)光LED驅(qū)動(dòng)電路圖(輸入電壓90-140VAC)
FEBFSEZ1317A_CH310v3評估板5.0V/0.7A手機(jī)電池充電器
This document describes a 3.5W power supply using an FSEZ1317AMY device. This power supply is targeted for mobile phone battery chargers for a 30mW solution with high efficiency.
The controller used on the board is Fairchild Semiconductor’s FSEZ1317AMY. This third-generation Primary-Side-Regulation (PSR) PWM controller with integrated MOSFET and improved EMI performance provides several features to enhance the performance of low-power flyback converters. The proprietary TRUECURRENT® technology enables precise Constant Current (CC) regulation and simplified circuit design for battery-charger applications. The result is a lower-cost, smaller, and lighter charger compared to conventional designs or a linear transformer. To minimize standby power consumption (30mW at 265VAC), a 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 FSEZ1317A, a charger can be implemented with few external components and minimized cost.
5.0V/0.7A手機(jī)電池充電器主要指標(biāo):
圖4.5.0V/0.7A手機(jī)電池充電器外形圖
圖5.5.0V/0.7A手機(jī)電池充電器電路圖
5.0V/0.7A手機(jī)電池充電器材料清單:
圖6.5.0V/0.7A手機(jī)電池充電器PCB布局圖:上:頂層,中:中間層,下:底層 |
