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User Guide for
FEBFDD850N10LD_CS001
35 W Boost Converter for
LED Drive using BoostPak
Featured Fairchild Product:
Direct questions or comments
about this evaluation board to:
“Worldwide Direct Support”
Fairchild Semiconductor.com
FDD850N10LD
© 2013 Fairchild Semiconductor Corporation FEBFDD850N10LD_CS001 • Rev. 1.0.0
Table of Contents
1. Introduction ............................................................................................................................... 3
1.1. Description ....................................................................................................................... 3
1.2. Features ............................................................................................................................ 3
1.3. FDD850N10LD Diagrams ............................................................................................... 3
2. Evaluation Board Specifications ............................................................................................... 4
3. Photographs............................................................................................................................... 5
4. Printed Circuit Board ................................................................................................................ 6
5. Schematic .................................................................................................................................. 7
6. Bill of Materials ........................................................................................................................ 8
7. Inductor Specifications ........................................................................................................... 10
8. Test Conditions & Test Equipment......................................................................................... 11
9. Performance of Evaluation Board ........................................................................................... 12
9.1. Switching Waveforms .................................................................................................... 12
9.2. Output Regulation Characteristics ................................................................................. 16
9.3. Loss Analysis ................................................................................................................. 17
9.4. Efficiency ....................................................................................................................... 20
9.5. Temperature ................................................................................................................... 21
9.6. EMI................................................................................................................................. 22
10. Revision History ..................................................................................................................... 23
© 2013 Fairchild Semiconductor Corporation 2 FEBFDD850N10LD_CS001 • Rev. 1.0.0
This user guide supports the evaluation kit for the FDD850N10LD. It should be used in
Figure 1. Pin Descriptions
Figure 2. Block Diagram
conjunction with the FDD850N10LD datasheets 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 driving of LED application using the
BoostPak (FDD850N10LD) for boost topology. The input voltage range is 20.4 V –
27.6 V and there is a single-channel DC output with a constant current of 640 mA at
55 V. This document contains a general description of FDD850N10LD, the converter
specification, a schematic, the bill of materials, and the typical operating characteristics.
1.1. Description
The N-channel MOSFET and NP diode are combined in one 5-lead D-Pak package
produced using Fairchild Semiconductor’s PowerTrench® process tailored to minimize onstate resistance while maintaining superior switching performance. The diode is a hyperfast rectifier with low forward-voltage drop and excellent switching performance. Using the
BoostPak FDD850N10LD in low-power LED backlight driving applications results in
lower profile and cost savings by reducing part count, weight, and PCB size as well as
improving reliability due to lower leakage current than Schottky Barrier Diode (SBD).
1.2. Features
Lower Conduction Resistance :
- R
- R
= 61 mΩ (Typ.) at VGS = 10 V, ID = 12 A
DS(on)
= 64 mΩ (Typ.) at VGS = 5.0 V, ID = 12 A
DS(on)
Low Gate Charge (Typ. 22.2 nC)
Low C
Fast Reverse Recovery Time: t
(Typ. 42 pF)
rss
rr
Fast Switching
100% Avalanche Tested
Improved dv/dt Capability
RoHS Compliant
1.3. FDD850N10LD Diagrams
(Typ.) = 11 ns at IF = 5 A, di/dt = 200 A/µs
© 2013 Fairchild Semiconductor Corporation 3 FEBFDD850N10LD_CS001 • Rev. 1.0.0
2. Evaluation Board Specifications
Description
Symbol
Value
Comments
Input Voltage
V
IN, MIN.
20.4 V V
IN, TYP.
24.0 V
V
IN, MAX.
27.6 V
Switching Frequency
fsw
200 kHz
R35 (kΩ)=15000/f
sw
(kHz)
Output Voltage / Current
V
OUT
55 V I
OUT
0.64 A
Output Power
P
OUT
35 W
Efficiency
> 92%
Temperature
T
BoostPak
T
Inductor
T
MOSFET
< 65°C
Initial Application
LED Backlight
All data was measured under the condition, TA=25°C.
Table 1. Summary of Features and Performance
© 2013 Fairchild Semiconductor Corporation 4 FEBFDD850N10LD_CS001 • Rev. 1.0.0
3. Photographs
Figure 3. Top View (114 x 76 mm2)
Figure 4. Bottom View (114 x 76 mm2)
© 2013 Fairchild Semiconductor Corporation 5 FEBFDD850N10LD_CS001 • Rev. 1.0.0
4. Printed Circuit Board
114.3mm
76.2mm
114.3mm
63.5mm
114.3mm
Figure 5. Top Side
Figure 6. Bottom Side
© 2013 Fairchild Semiconductor Corporation 6 FEBFDD850N10LD_CS001 • Rev. 1.0.0
5. Schematic
Figure 7. Evaluation Board Schematic
© 2013 Fairchild Semiconductor Corporation 7 FEBFDD850N10LD_CS001 • Rev. 1.0.0
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