FAIRCHILD FEB-LO26 User Guide
Summary
Develop efficient universal line voltage LED ballasts with this FL7732 evaluation board kit. This essential guide details the technical implementation of a cost-effective solution featuring the Fairchild FL7732 Primary-Side Regulator (PSR) controller. The manual provides comprehensive schematics, BOM, and operational data covering constant current regulation, power factor correction, low THD performance, and integrated protections (Over/Short/Open-LED). Designed for electrical engineers working on advanced lighting solutions, this kit ensures high efficiency and reliability across a wide range of input voltages.
Page 1 Text Content
User Guide for
FEB-L026 Evaluation Board
Universal Line Voltage LED Ballast
Featured Fairchild Product:
FL7732
Direct questions or comments about this evaluation board to: “Worldwide Direct Support”
Fairchild Semiconductor.com
© 2012 Fairchild Semiconductor Corporation 1 FEB-L026_FL7732 • Rev. 1.1.0
Page Summary Contents For FAIRCHILD FEB-LO26 User Guide
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User Guide for FEB-L026 Evaluation Board Universal Line Voltage LED Ballast Featured Fairchild Product: FL7732 Direct questions or comments about this evaluation board to: “Worldwide Direct Support” F...
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Table of Contents 1. Introduction ............................................................................................................................. 3 1.1. General Description of FL7732 ......
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This user guide supports the evaluation kit for the FL7732. It should be used in conjunction with the FL7732 datasheet as well as Fairchild’s application notes and technical support team. Please visit...
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1.3. Internal Block Diagram Figure 1. Block Diagram of FL7732 © 2012 Fairchild Semiconductor Corporation 4 FEB-L026_FL7732 • Rev. 1.1.0
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2. Specifications for Evaluation Board Table 1. Specifications for LED Lighting Lamp Description Symbol Value Comments VIN.MIN 90V Minimum Input Voltage Voltage VIN.MAX 265V Maximum Input Voltage Inpu...
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2.1. Evaluation Board Figure 2. Top View (Dimensions:79mm (L) x 30mm (W) x 20mm (H)) Figure 3. Bottom Views (Dimensions:79mm (L) x 30mm (W) x 20mm (H)) © 2012 Fairchild Semiconductor Corporation 6 FEB...
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2.2. Printed Circuit Board Dimension: mm Figure 4. Top Pattern Figure 5. Bottom Pattern © 2012 Fairchild Semiconductor Corporation 7 FEB-L026_FL7732 • Rev. 1.1.0
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2.3. Schematic of the Evaluation Board Figure 6. Schematic © 2012 Fairchild Semiconductor Corporation 8 FEB-L026_FL7732 • Rev. 1.1.0
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2.4. Bill of Materials Item Part Part Number Qty. Description Manufacturer No. Reference Fairchild 1 BD1 DF06S 1 1.5A/600V Bridge Diode Semiconductor 2 CF1 MPX AC275V 104K 1 104/AC275V X-Capacitor Car...
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2.5. Transformer Design Figure 7. Transformer Bobbin Structure and Pin Configuration Figure 8. Transformer Winding Structure Table 2. Winding Specifications No. Winding Pin (S → F) Wire Turns Winding ...
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3. Performance of Evaluation Board Table 4. Test Condition & Equipments Ambient Temperature TA = 25°C AC Power Source: PCR500L by Kikusui Power Analyzer: PZ4000000 by Yokogawa Electronic Load: PLZ...
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3.1. Startup Startup time is 890ms (VIN = 90VAC) ~ 362ms (VIN = 265VAC). The results were measured by using 7-LED load. Startup Time at 7-LED (25V/700m A); C1 [VDD], C2 [VIN], C3 [VOUT], C4 [IOUT]. Fi...
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3.2. Operation Waveforms Output current ripple is under 250m Ap-p with a rated output current of 700m A. Operation Waveforms at 7-LED (25V/700m A); C1 [VCS], C2 [VIN], C3 [VOUT], C4 [IOUT]. Figure 13....
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3.3. Constant-Current Regulation Constant current deviation in the wide output voltage range from 11V to 28V is less than 2.88% at each line input voltage. Line regulation at the rated output voltage ...
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3.4. Short- / Open-LED Protections In short-LED condition, OCP level is reduced from 0.7V to 0.2V because FL7732 lowers OCP level when VS voltage is less than 0.4V during output diode conduction time....
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3.5. Power Factor System efficiency is 86.45% ~ 89.03% in 90 ~ 265VAC input voltage range. The results were measured at 30 minutes after startup by using 7-LED. 90Vac 120Vac 140Vac 180Vac 230Vac 265Va...
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3.6. PF & THD FL7732 shows excellent THD performance. THD is much less than 30% specification. The results were measured at 30 minutes after startup. Figure 23. Power Factor & Total Harmonic D...
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3.7. Operating Temperature Temperature of the all components on this board is less than 71 ºC. The results were measured at 30 minutes after startup. Bottom Top MOSFET: 63.0 ºC Rectifier: 70.5 ºC Tran...
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3.8. EMI The all measurement was conducted in observance of EN55022 criteria. The results were measured at 30 minutes after startup by using actual LED load. Figure 26. EMI, VIN = 110VAC Figure 27. EM...
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4. Revision History Rev. Date Description 1.0.0 April 2012 Initial Release Manufacturer & Part number are added in BOM FL7732 is changed to FL7732MY_F116 (no frequency hopping) 1.1.0 June 2012 PF/...
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 20 |
| File Size | 3.02 MB |
| Published | July 06, 2026 |
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Frequently Asked Questions
What is the input voltage range supported?
The input voltage range is 90V – 265V.
How is constant current regulation maintained?
It regulates accurate output current independent of input voltage, output voltage, and magnetizing inductance variation.
Does the FL7732 offer protection features?
Yes, it provides open-LED, short-LED, over-temperature protections, and cycle-by-cycle current limiting.
What advantages does using this single-stage topology provide?
It reduces external components, such as input bulk capacitor and feedback circuitry, which helps minimize cost.