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© 2012 Fairchild Semiconductor Corporation 1 FEBFL7701_L30U003A • Rev.1.0.2 User Guide for FEBFL7701_L30U003A 2.4W LED Ballast Using FL7701 Featured Fairchild Product: FL7701 Direct questions or comments about this evaluation board to: “Worldwide Direct Support” Fairchild Semiconductor.com
© 2012 Fairchild Semiconductor Corporation 2 FEBFL7701_L30U003A • Rev. 1.0.2 Table of Contents
© 2012 Fairchild Semiconductor Corporation 3 FEBFL7701_L30U003A • Rev. 1.0.2 This user guide supports the Evaluation kit for the FL7701. It should be used in conjunction with the FL7701 datasheet as well as Fairchild’s application notes and technical support team. Please visit Fairchild’s website at www.fairchildsemi.com. 1. Introduction This document describes the proposed solution for a universal-input 2.4W LED ballast using the FL7701. The input voltage range is 90V RMS – 265V RMS and there is one DC output with a constant current of 85mA at 28V MAX. This document c ontains general description of FL7701, the power supply specification, schematic, bill of materials, and the typical operating characteristics. 1.1. General Description The FL7701 LED lamp driver is a simple IC with PFC function. The special “adopted digital” technique automatically detects i nput voltage condition and sends an internal reference signal, resulting in high power factor . When an AC input voltage is applied to the IC, the PFC function is automatically enable d. Otherwise, when a DC input is applied to the IC, the PFC function is automatically disabled. The FL7701 does not require a bulk capacitor (electrolytic capacito r) for supply rail stability, which can significantly affect LED reliability. 1.2. Key Features Digitally Implemented Active PFC Function Built-in Self-Biasing HV Startup Circuit Application Input Range: 80VAC ~ 308VAC AOCP Function with Auto-Restart Mode Built-in Over-Temperature Protection Cycle-by-Cycle Current Limit Current-Sense Pin Open Protection Low Operating Current: 0.85mA (Typical) Under-Voltage Lockout with 5V Hysteresis Programmable Oscillator Frequency Programmable LED Current Analog Dimming Function Fixed Soft-Start Function Precise Internal Reference: ±3%
Figure 1. Internal Block Diagram voltage. The CS pin is also used to set the LED current regulation. 2 OUT Output. Connects to the MOSFET gate.
5 ADIM
bypass capacitor between ADIM and GND. 6 GND GROUND. Ground for the IC.
7 NC No Connection
- General Specifications for Evaluation Board
Table 1. Summary of Features and Performance
- The output current has ILEDPK ripple. To reduce ripple current, use a large electrolytic capacitor in
condition or use a Zener diode for protection.
- The output power is not equal to the apparent power due to the slight phase shift between the output
Figure 7. Schematic of Evaluation
© 2012 Fairchild Semiconductor Corporation 9 FEBFL7701_L30U003A • Rev. 1.0.2 6. Bill of Materials Qty Reference Part Number Value Description Manufacturer PCB Silkscreen
1 U1 FL7701 Controller Fairchild
1 BD MB6S 0.5A / 600V Diode, Bridge, 600V, 0.5A Fairchild Semiconductor
1 C1 MPE 630V223K 22nF Capacitor, 630VAC, 10%,
1 C2 MPE 630V333K 33nF Capacitor, 630VAC, 10%,
1 C3 C0805C101K3RACTU 100pF Capacitor, SMD, Ceramic,
25V, X7R Kemet ADIM 1 C4 C1206C225K3PACTU 2.2µF Capacitor, SMD, Ceramic, 25V, X7R Kemet VCC
1 D1 UF4007 1A /
Diode, 1kV, 1A Ultra-Fast Recovery Fairchild Semiconductor FRD
1 D2 1N4148 1A /
100V/1A, Small-Signal Diode Fairchild Semiconductor 4148 2 L1, L2 R06153KT00 15mH Inductor, Radial, R6.5x7.5 Bosung L1, L2 1 L3 R06402KT00 4mH Inductor, Radial, R6.5x7.5 Bosung L3
1 R1 RC1206JR-07680RL 680R Resistor,SMD,1/4W,1206 Yageo
1 R2 RC1206JR-0710KL 10k Resistor,SMD,1/4W,1206 Yageo
1 R3 RC0805JR-0724KL 24k Resistor,SMD,1/8W,0805 Yageo RT
1 R4 RC0805JR-07510RL 510R Resistor,SMD,1/8W,0805 Yageo RG
1 R5 RC1206JR-073RL 3.0R Resistor,SMD,1/4W,1206 Yageo RCS 7. Test Condition & Test Equipment Evaluation Board FEBFL7701_L30U003A Test Date 2012.01.19 Test Temperature TA = 25°C Test Equipments AC Source: PCR500L by Kikusui Power Meter: PZ4000 by Yokogawa Oscilloscope: Waverunner 64Xi by Lecroy EMI Test Receiver: ESCS30 by ROHDE & SCHWARZ Two-Line V-Network: ENV216 by ROHDE & SCHWARZ Thermometer: CAM SC640 by FLIR SYSTEMS LED: EHP-AX08EL/GT01H-P03 (3W) by Everlight
Figure 12. Operating Frequency & Minimum Duty
Table 2. Output Characteristics by Input Voltage & Frequency
© 2012 Fairchild Semiconductor Corporation 24 FEBFL7701_L30U003A • Rev. 1.0.2 10. Revision History Rev. Date Description 0.0.1 2011.11.16 First issue 1.0.1 2011.11.30 Update IC temperature FEB_L030 to FEBFL7701_L30U003A WARNING AND DISCLAIMER Replace components on the Evaluation Board only with those parts shown on the parts list (or Bill of Materials) in the Users’ G uide. Contact an authorized Fairchild representative with any questions. This board is intended to be used by certified professionals, in a lab environment, following proper safety procedures. Use at your own risk. The Evaluation board (or kit) is for demonstration purposes only and neit her the Board nor this User’s Guide constitute a sales contract or create any kind of warranty, whether express or implied, as to the applications or products involved. Fairchil d warrantees that its products me et Fairchild’s published specifications, but does not guarantee that its products work in any specific application. Fairchild reserves the right to make changes without notice to any products described herein to improve reli ability, function, or design. Either the applicable sales contract signed by Fairc hild and Buyer or, if no contract exists, Fairchild’s standard Terms and Conditions on the back of Fairchild invoices, govern the terms of sale of the products described herein. DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENS E UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITI CAL COMPONENTS IN LIFE SU PPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. ANTI-COUNTERFEITING POLICY Fairchild Semiconductor Corporation's Anti-Counterfeiting Policy. Fa irchild's Anti-Counterfeiting Policy is also stated on our external website, www.fairchildsemi.com, under Sales Support. Counterfeiting of semiconductor parts is a growing problem in th e industry. All manufacturers of semiconductor products are exp eriencing counterfeiting of their parts. Customers who inadvertently purchase counterfeit parts experience many problems such as loss of brand reputation, substandard performance, failed applications, and increased cost of production and manufacturing delays. Fairchild is taking st rong measures to protect ourselves and our customers from the proliferation of counterfeit parts. Fairchild st rongly encourages customers to pur chase Fairchild parts either directly from Fairchild or from Authorized Fairchild Distributors who are listed by country on our web page cited above. Products customers buy either from Fairchild directly or from Authorized Fairchild Distributors are genuine parts, have full traceability, meet Fairch ild's quality standards for handling and storage and provide access to Fairchild's full range of up-to-date technical and product information. Fairchild an d our Authorized Distributors will stand behind all warranties and will appropriate ly address any warranty issues that may arise. Fairchild will not provide any warranty coverage or other assistance for parts bough t from Unauthorized Sources. Fairchild is committed to combat this global problem a nd encourage our customers to do their part in stopping this practice by buying direct or from authorized distributors. EXPORT COMPLIANCE STATEMENT These commodities, technology, or software were exported from the United States in accordance with the Export Administration Regulations for the ultimate destination listed on the commercial invoice. Diversion contrary to U.S. law is prohibited. responsible to ensure the appropriate U.S. export regulations are followed.