Fairchild RD-011 11 - FL7930B, FLS1800XS and FAN7346 LED Illumination Design Data Manual
Summary
Ideal reference design solution for building high-efficiency LED illumination power supplies from 100–265V AC. This manual provides comprehensive engineering details, including detailed schematics and component specifications, allowing designers to build sophisticated lighting systems using key management chips like FL7930B, FLS1800XS, and FAN7346. Perfect for electrical engineers developing advanced, reliable LED drivers requiring PFC and precise current control.
Page 1 Text Content
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Fairchild Reference Design The following reference design supports inclusion of FL7930B, FLS1800XS and FAN7346 in design of LED illumination. It should be used in conjunction with the FL7930B, FLS1800XS and FAN7346 datasheet as well as Fairchild’s application notes and technical support team. Please visit Fairchild’s website at www.fairchildsemi.com.
Application Fairchild Device Input Voltage Rated Output Output Voltage
Range Power (Rated Current)
LED Illumination FL7930B, 90 ~ 265VAC 100W 100V
(4-CH : 250m A/CH)
FLS1800XS
(1-CH : 1.0A)
FAN7346
1. Key Features of Main Controller
1.1. FL7930B
Additional OVP Detection Pin Input Voltage Absent Detection Circuit Internal Soft-Start without Overshoot Internal Total Harmonic Distortion (THD) Optimizer Precise Adjustable Output Over-Voltage Protection MOSFET Over-Current Protection
1.2. FLS1800XS
Variable Frequency Control with 50% Duty Cycle High Efficiency through Zero Voltage Switching (ZVS) Up to 300 KHz Operating Frequency Auto-Restart Operation for All Protections with External LVCC Protection Functions: Over-Voltage Protection (OVP), Over-Current Protection (OCP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD)
1.3. FAN7346
Linear Balance Control for 4-Channel LED Arrays Wide input Voltage Range: 10V to 100V Precision Current Accuracy Trimmed to 1.5% Support Wide Dimming Ratio: 0.5% ~ 100% Protection Functions: Channel Individual Open LED Protection (OLP), Channel Individual Short LED Protection (SLPR), Channel Individual Over Current Protection (OCP), Thermal Shutdown Function (Auto-Recovery)
© 2011 Fairchild Semiconductor Corporation 1 RD-L011_FL7930B_FLS1800XS_FAN7346 • Rev. 1.0.1
Page Summary Contents For Fairchild RD-011 11 - FL7930B, FLS1800XS and FAN7346 LED Illumination Design Data Manual
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 8 |
| File Size | 513.96 KB |
| Published | July 06, 2026 |
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Frequently Asked Questions
What are the primary protection features of the FLS1800XS?
It offers OVP, OCP, AOCP, and internal TSD. It also supports auto-restart with external LV CC.
How can the FAN7346 control LED lighting?
It uses linear balance control for 4-channel arrays, offering wide dimming (0.5% to 100%) and protecting channels individually from open circuits or short circuits.
What is required when using this reference design?
You must use the FL7930B, FLS1800XS, and FAN7346 datasheets, along with Fairchild application notes, and consult their technical support.
What do the transformers need for optimal operation?
The PFC transformer (TM1) has specific winding specifications, noting a 280uH ±5% inductance at 100KHz, 1V.