Datasheet FEBL010 Datasheet (Fairchild)

User Guide for

FEBL010

Evaluation Board

Universal LED Driver using the FL6961

CRM PFC Controller

Featured Fairchild Product:

FL6961

Direct questions or comments

about this evaluation board to:

“Worldwide Direct Support”

Fairchild Semiconductor.com

Table of Contents

1. Introduction ............................................................................................................................... 3

1.1. General Description of FL6961 ....................................................................................... 3

1.2. Features of FL6961 .......................................................................................................... 3

1.3. Block Diagram ................................................................................................................. 4

2. General Specifications for Evaluation Board ........................................................................... 5

2.1 Photographs of the Evaluation Board .............................................................................. 6

2.2 Printed Circuit Board ....................................................................................................... 7

2.3 Schematic of the Evaluation Board .................................................................................. 8

2.4 Bill of Materials ............................................................................................................... 9

2.5 Connections Transformer and Winding Specifications ................................................. 11

3 Performance of Evaluation Board ........................................................................................... 12

3.1 Test Condition & Items .................................................................................................. 12

3.2 Electrical Efficiency ....................................................................................................... 13

3.3 Power Factor .................................................................................................................. 14

3.4 Constant Current & Constant Voltage (CC/CV) ........................................................... 15

3.5 THD Performance .......................................................................................................... 17

3.6 Temperature Checking Results ...................................................................................... 19

3.7 Startup Time................................................................................................................... 20

3.8 Operation Waveforms .................................................................................................... 22

3.9 Short-Circuit Protection ................................................................................................. 24

3.10 Stress of the MOSFET & Rectifier ................................................................................ 25

3.11 Stress of the MOSFET & Rectifier ................................................................................ 29

4. Revision History ..................................................................................................................... 30

This user guide supports the evaluation kit for the FL6961. It should be used in conjunction with the FL6961 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 LED ballast using the FL6961 CRM PFC controller. The input voltage range is 90V one DC output with a constant current of 1.25A at 24V general description of FL6961, the power supply specification, schematic, bill of materials, and the typical operating characteristics.

1.1. General Description of FL6961

The FL6961 is an active Power Factor Correction (PFC) controller for boost PFC applications that operate in Critical conduction Mode (CRM). It uses a voltage mode PWM that compares an internal ramp signal with the error amplifier output to generate the MOSFET turn-off signal. Because the voltage-mode CRM PFC controller does not need rectified AC line voltage information, it saves the power loss of the input voltagesensing network required by the current-mode CRM PFC controller.

1.2. Features of FL6961

– 265V

RMS

. This document contains

MAX

and there is

RMS

 Boundary Mode PFC Controller  Low Input Current THD  Controlled On-Time PWM  Zero-Current Detection (ZDC)  Cycle-by-Cycle Current Limiting  Leading-Edge Blanking Instead of RC Filtering  Low Startup Current: 10µA (Typical)  Low Operating Current: 4.5mA (Typical)  Feedback Open-Loop Protection  Programmable Maximum On-Time (MOT)  Output Over-Voltage Clamping Protection  Clamped Gate Output Voltage: 16.5V

1.3. Block Diagram

Figure 1. Internal Block Diagram of FL6961

2. General Specifications for Evaluation Board

All data of the evaluation board was measured with the board enclosed in a case and external temperature of around 25°C.

Table 1. Summary of Features and Performance

Main Controller FL6961

Input Voltage Range 90VAC~265VAC

Input Voltage Frequency 47Hz~63Hz

Rated Output Power 30W

Rated Output Voltage 24V

Rated Output Current 1.25A

Application LED Lighting

2.1 Photographs of the Evaluation Board

Figure 2. Photograph (125mm (W) x 41mm (H)) Top View

Figure 3. Photograph (125mm (W) x 41mm (H)) Bottom View

2.2 Printed Circuit Board

Figure 4. Printed PCB, Top Side

Figure 5. Printed PCB, Bottom Side

2.3 Schematic of the Evaluation Board

Figure 6. Schematic of Evaluation

2.4 Bill of Materials

Table 2. Bill of Materials of Evaluation Board

Item

No.

1 U101 FL6961 1

2 D102, D103 ,D203 RS1M 3

3 Q102 FQPF8N80C 1

4 D101 KBL04 1 Bridge Diode (Fairchild Product)

5

6 Q101, Q201 MMBT2222A 2

7 U102 FOD817 1 Opto-Coupler (Fairchild Product)

8 U203 KA431S 1 Shunt Regulator (Fairchild Product)

9 U201 LM2904 1 Dual OP Amp (Fairchild Product)

10 D201 FFPF12UP20DN 1

11 ZD101, ZD102 FLZ16V 2 Zener Diode (Fairchild Product)

12 C106 102/1kV 1 Ceramic-Capacitor

13 C101 154/275V 1 X – Capacitor

14 C102 224/275V 1 X – Capacitor

15 C112 222/250V 1 Y – Capacitor

16 C114, C115 471/250V 2 Y – Capacitor

17 C201, C202 1000µF / 35V 2 Electrolytic Capacitor

18 C108 10µF/50V 1 Electrolytic Capacitor

19 C109 22µF/50V 1 Electrolytic Capacitor

20 C203 33µF/50V 1 Electrolytic Capacitor

21 C103 154/630V 1 Film Capacitor

22

23 C107 100/2012 1 SMD Capacitor 2012

24 C110 N/C 1 SMD Capacitor 2012

25 C111 104/2012 1 SMD Capacitor 2012

26 C204, C205 474/2012 2 SMD Capacitor 2012

27 F101 250V/1A 1 Fuse

28 L101 200µH 1 Inductor

Part Reference Value Qty Description (Manufacturer)

D104, D204, D205,

D206

C104, C105, C113,

C207

CRM PFC Controller

(Fairchild Product)

1000V/1A Ultra-Fast Recovery Diode

(Fairchild Product)

800V/8A MOSFET (Fairchild Product)

LL4148 4

105/2012 4 SMD Capacitor 2012

General-Purpose Diode

(Fairchild Product)

General-Purpose Transistor

(Fairchild Product)

Ultrafast Recovery Power Rectifier

(Fairchild Product)

Continued on the following page…

Bill of Materials (Continued)

Item

No.

29 LF101, LF102 40mH 2 Line Filter

30 L201 10µH 1 Stick Inductor

31 T2 EER2828 1 Transformer, 700µH, 1kHz, 1V

32 R201 0R1/3W 1 Metal Film Resistor 3W

33 R108 100K 2W 1 Metal Oxide Film Resistor 2W

34 R122 N/C 1 SMD Resistor 2012

35 R109, R116, R120 100/2012 3 SMD Resistor 2012

36 R110, R208, R209 473/2012 3 SMD Resistor 2012

37 R111, R213, R214 392/2012 3 SMD Resistor 2012

38 R112, R212 333/2012 2 SMD Resistor 2012

39 R113, R210 124/2012 2 SMD Resistor 2012

40 R114 103/2012 1 SMD Resistor 2012

41 R115 203/2012 1 SMD Resistor 2012

42 R117 1R0/2012 1 SMD Resistor 2012

43 R205 272/2012 1 SMD Resistor 2012

44 R206 513/2012 1 SMD Resistor 2012

45 R207 682/2012 1 SMD Resistor 2012

46 R211 562/2012 1 SMD Resistor 2012

47 R102, R103, R104 564/3216 3 SMD Resistor 3216

48 R105, R106, R107 823/3216 3 SMD Resistor 3216

49 R118, R119 0R51/3216 2 SMD Resistor 3216

50 R215 103/3216 1 SMD Resistor 3216

51 R216 153/3216 1 SMD Resistor 3216

Part Reference Value Qty Description (Manufacturer)

2.5 Connections Transformer and Winding Specifications

Figure 7. Transformer Specifications & Construction [EER2828]

Table 3. Winding Specifications

No Winding Pin (S  F) Wire Turns Winding Method

1 1/2Np 1  2 0.45φ×1 44 Ts Solenoid Winding

2 Insulation: Polyester Tape t = 0.025mm, 3-Layer

3 Ns1 6  9 0.65φ×2 15 Ts Solenoid Winding

4 Insulation: Polyester Tape t = 0.025mm, 3-Layer

5 Ns1 7  10 0.65φ×2 15 Ts Solenoid Winding

6 Insulation: Polyester Tape t = 0.025mm, 3Layers

7 1/2Np 2  3 0.45φ×1 44 Ts Solenoid Winding

8 Insulation: Polyester Tape t = 0.025mm, 3-Layer

9

10 Insulation: Polyester Tape t = 0.025mm, 3-Layer

Table 4. Electrical Characteristics

Pin Specifications Remark

Inductance 1 – 3 700µH ±7% 1kHz, 1V

Leakage 1 – 3 30µH Maximum Short All Output Pins

Naux 5  4 0.45φ×1 11 Ts

Ns1 7  8 0.45φ×1 11 Ts

Solenoid Winding

3 Performance of Evaluation Board

3.1 Test Condition & Items

Table 5. Test Condition & Test Equipment

Ambient Temperature T

Test Equipment

Test Items

= 25°C

A

AC Power Source: PCR500L by Kikusui Power Analyzer: 2574R series by Xitron Electronic Load: PLZ303WH by KIKUSUI Multi Meter: 2002 by KEITHLEY, 45 by FLUKE Oscilloscope: 104Xi by LeCroy EMI Test Receiver: ESCS30 by ROHDE & SCHWARZ Two-Line V-Network: ENV216 by ROHDE & SCHWARZ Thermometer: Thermal CAM SC640 by FLIR SYSTEMS

3.2. Electrical Efficiency

3.3. Power Factor

3.4. Constant Current & Constant Voltage (CC/CV)

3.5. THD Performance

3.6. Temperature Checking Results

3.7. Startup Time

3.8. Operation Waveforms

3.9 Short-Circuit Protection

3.10. Stress on MOSFET & Rectifier

3.11. EMI Result

3.2 Electrical Efficiency

Figure 8 shows at least 84% system efficiency with universal input condition at the rated output load.

87.0

86.0

85.0

84.0

83.0

Efficiency [%]

82.0

81.0 90V 115V 230 265V

Input Voltage [VAC]

Figure 8. System Efficiency

Input Voltage 90VAC 115VAC 230VAC 265VAC

Efficiency [%] 84.05 85.73 86.42 86.07

3.3 Power Factor

Figure 9 shows over 90% PF results with universal input condition at rated output power.

1.00

0.98

0.96

0.94

0.92

Power Factor

0.90

0.88

0.86 90V 115V 230 265V

Input Voltage [VAC]

Figure 9. Power Factor

Input Voltage 90VAC 115VAC 230VAC 265VAC

PF 0.9882 0.9812 0.9330 0.9051

3.4 Constant Current & Constant Voltage (CC/CV)

Figure 10 shows the typical CC/CV performance on the board, showing very stable CC performance at 90V

Input Voltage Min. Current Max. Current Tolerance Remark

90VAC / 60Hz 1.318 1.333 1.13%

115VAC / 60Hz 1.308 1.321 0.98%

230VAC / 60Hz 1.285 1.307 1.68%

230VAC / 60Hz 1.292 1.308 1.22%

Total 1.285 1.333 3.60%

25

20

~ 265VAC input conditions.

AC

< 10%

15

10

Output Voltage[V]

5

0

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

Output Current [A]

Figure 10. CC/CV Performance

90Vac

115Vac

230Vac

265Vac

Table 6. CC and CV Measured Data

90V

AC

115V

AC

220V

AC

265V

AC

Vout Iout V out Iout Vout Iout Vout Iout

23.50 0.0000 23.50 0.0000 23.50 0.0000 23.50 0.0000

23.75 0.2440 23.75 0.2440 23.75 0.2440 23.74 0.2440

23.75 0.2813 23.75 0.2810 23.75 0.2810 23.74 0.2810

23.75 0.3190 23.75 0.3190 23.75 0.3190 23.74 0.3190

23.75 0.3630 23.75 0.3630 23.75 0.3630 23.74 0.3630

23.75 0.4320 23.75 0.4320 23.75 0.4320 23.74 0.4317

23.75 0.5260 23.75 0.5260 23.75 0.5260 23.74 0.5260

23.74 0.6760 23.75 0.6760 23.75 0.6760 23.74 0.6760

23.74 0.9520 23.75 0.9520 23.75 0.9520 23.74 0.9520

23.74 1.2140 23.75 1.2140 23.75 1.2140 23.74 1.2140

23.74 1.2770 23.75 1.2770 23.75 1.2770 23.74 1.2770

23.74 1.3080 23.75 1.3080 23.75 1.3067 23.74 1.3080

23.74 1.3330 23.32 1.3210 22.88 1.2847 23.00 1.2920

22.85 1.3197 22.67 1.3090 22.26 1.2850 22.38 1.2923

22.34 1.3190 22.16 1.3090 21.77 1.2853 21.88 1.2923

21.75 1.3190 21.59 1.3090 21.21 1.2857 21.32 1.2930

21.28 1.3187 21.13 1.3090 20.76 1.2863 20.87 1.2930

20.75 1.3183 20.60 1.3090 20.25 1.2867 20.35 1.2930

20.16 1.3183 20.02 1.3090 19.69 1.2873 19.78 1.2937

19.68 1.3180 19.55 1.3093 19.24 1.2880 19.32 1.2937

19.15 1.3180 19.03 1.3093 18.73 1.2887 18.81 1.2940

18.65 1.3180 18.54 1.3097 18.25 1.2893 18.32 1.2947

18.11 1.3180 18.00 1.3097 17.73 1.2903 17.79 1.2947

17.60 1.3183 17.49 1.3097 17.24 1.2907 17.30 1.2953

17.07 1.3183 16.96 1.3100 16.72 1.2913 16.78 1.2960

16.45 1.3190 16.34 1.3097 16.12 1.2923 16.18 1.2970

15.98 1.3190 15.87 1.3093 15.70 1.2930 15.75 1.2977

15.70 1.3190 15.59 1.3093 15.41 1.2940 15.45 1.2980

15.46 1.3190 15.35 1.3093 15.18 1.2947 15.22 1.2983

15.18 1.3183 15.07 1.3093 0.00 0.0000 0.00 0.0000

14.95 1.3180 14.84 1.3087 0.00 0.0000

14.81 1.3180 0.00 0.0000 0.00 0.0000

14.68 1.3180 0.00 0.0000 0.00 0.0000

0.00 0.0000 0.00 0.0000 0.00 0.0000

3.5 THD Performance

Figure 11 through Figure 14 show the test results of the FL6961 evalutaiton board. All of the results meet international regulations.

30

25

20

15

10

% of Fundamental

5

0

3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

30

25

Harmonic Number

Figure 11. THD Performance Results at 90VAC

90Vac(IEC)

90Vac(Test)

115Vac(IEC)

115Vac(Test)

20

15

10

% of Fundamental

5

0

3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

Harmonic Number

Figure 12. THD Performance Results at 115VAC

30

25

20

15

10

% of Fundamental

5

0

3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

Figure 13. THD Performance Results at 230VAC

30

230Vac(IEC)

230Vac(Test)

Harmonic Number

265Vac(IEC)

25

265Vac(Test)

20

15

10

% of Fundamental

5

0

3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39

Harmonic Number

Figure 14. THD Performance Results at 265VAC

3.6 Temperature Checking Results

(

)

Figure 15 through Figure 18 show the temperature-checking results on the board in minimum and maximum input voltage condition.

90VAC / 60Hz 265VAC / 60Hz Remark

Bridge Diode 62.8°C 53.8°C Top Side Circle

Transformer 54.6°C 54.8°C Top Side Line

FET 61.1°C 53.8°C Top Side Spot

Rectifier 64.7°C 62.3°C Top Side Box

FET

(61.1℃)

Bridge Diode

62.8℃)

Transformer

(54.6°C)

Rectifier (64.7°C)

Bridge Diode

(59.5)

FET

(63.3℃)

Rectifier (60.8°C)

Figure 15. 90VAC / 60Hz; Top Side Figure 16. 90VAC / 60Hz; Bottom Side

FET

(53.8℃)

Transformer

(54.8℃)

Start Up Resistor

(64.1℃)

Rectifier

Bridge Diode

45.5℃)

(62.3℃)

Bridge Diode

48.9℃

Rectifier

(60.2℃)

Figure 17. 265VAC / 60Hz; Top Side Figure 18. 265VAC / 60Hz; Bottom Side

3.7 Startup Time

V

VAC/

Figure 19 and Figure 20 show the typical startup performance of the board. A longer startup time to release the UVLO function can be achieved at 90V 265V the board.

condition. This time normally depends on the starting resistor and capacitor on

AC

Input Voltage Turn-On Time Remark

90VAC / 60Hz 0.936s

265VAC / 60Hz 0.279s

condition rather than

AC

< 1s

Figure 19. 90

/ 60Hz CH1 (Yellow): V

AC

CH3 (Blue): V

IN

OUT

,

Figure 20. 265

60Hz CH1 (Yellow): V

CH3 (Blue): V

IN

OUT

,

Figure 21 through Figure 24 show the typical startup performance of the Flyback circuit

V

VAC/

on the board.

Input Voltage Turn-On Time Remark

90VAC / 60Hz 0.922s

115VAC / 60Hz 0.669s

230VAC / 60Hz 0.309s

265VAC / 60Hz 0.263s

< 1s

Figure 21. 90

/ 60Hz, CH1 (Yellow): VCC, CH3

AC

(Blue): V

, CH4 (Green): IDS

DS

Figure 23. 230

CH3 (Blue): V

60Hz CH1 (Yellow): VCC,

, CH4 (Green): IDS

DS

Figure 22. 115

CH3 (Blue): V

Figure 24. 265

CH3 (Blue): V

60Hz, CH1 (Yellow): VCC,

, CH4 (Green): IDS

DS

60Hz ,CH1 (Yellow): VCC,

, CH4 (Green): IDS

DS

3.8 Operation Waveforms

V

VAC/

V

VAC/

Figure 25 through Figure 28 show the normal operation waveforms on the board at different input voltage conditions. The output voltage maintains the output level with 120Hz ripple voltage.

Figure 25. 90

/ 60Hz, CH1 (Yellow): VO, CH3

AC

(Blue): V

, CH4 (Green): IDS

DS

Figure 26. 115

CH3 (Blue): V

60Hz, CH1 (Yellow): VO,

, CH4 (Green): IDS

DS

Figure 27. 230

CH3 (Blue): V

/ 60Hz, CH1 (Yellow): VO,

AC

, CH4 (Green): IDS

DS

Figure 28. 265

CH3 (Blue): V

60Hz, CH1 (Yellow): VO,

, CH4 (Green): IDS

DS

Figure 29 through Figure 32 show the input current waveforms on the board at different

V

VAC/

V

VAC/

input voltage conditions.

Figure 29. 90

/ 60Hz, CH3 (Blue): VIN,

AC

CH4 (Green): I

IN

Figure 30. 115

Figure 31. 230

/ 60Hz, CH3 (Blue): VIN,

AC

CH4 (Green): I

IN

Figure 32. 265

60Hz, CH3 (Blue): VIN,

CH4 (Green): I

IN

60Hz, CH3 (Blue): VIN,

CH4 (Green): I

IN

3.9 Short-Circuit Protection

V

VAC/

V

VAC/

Figure 33 through Figure 36 show the typical output waveforms at short load condition. The IC repeats ON and OFF functions in this mode.

Figure 33. 90

Figure 35. 230

/ 60Hz, CH3 (Blue): VDS,

AC

CH4 (Green): I

/ 60Hz, CH3 (Blue): VDS,

AC

CH4 (Green): I

DS

Figure 34. 115

Figure 36. 265

60Hz, CH3 (Blue): VDS,

CH4 (Green): I

60Hz, CH3 (Blue): VDS,

CH4 (Green): I

DS

3.10 Stress of the MOSFET & Rectifier

V

VAC/

V

VAC/

Figure 37 through Figure 40 show the voltage stress on the MOSFET at startup with the rated load condition.

90VAC / 60Hz 115VAC / 60Hz 230VAC / 60Hz 265VAC / 60Hz

MOSFET (VDS) 442V 462V 644V 728V

MOSFET (IDS) 2.36A 2.38A 2.46A 2.42A

Rectifier (VAK) 54.5V 60.5V 84.5V 90.5V

Rectifier (IAK) 3.50A 3.32A 3.54A 3.42A

Figure 37. 90

Figure 39. 230

/ 60Hz, CH3 (Blue): VDS,

AC

CH4 (Green): I

/ 60Hz, CH3 (Blue): VDS,

AC

CH4 (Green): I

DS

Figure 38. 115

Figure 40. 265

60Hz, CH3 (Blue): VDS,

CH4 (Green): I

60Hz, CH3 (Blue): VDS,

CH4 (Green): I

DS

Figure 41 through Figure 44 show the current stress on the MOSFET at startup with the

V

VAC/

V

VAC/

rated load condition.

Figure 41. 90

Figure 43. 230

/ 60Hz, CH3 (Blue): VDS,

AC

CH4 (Green): I

/ 60Hz, CH3 (Blue): VDS,

AC

CH4 (Green): I

DS

Figure 42. 115

Figure 44. 265

60Hz, CH3 (Blue): VDS,

CH4 (Green): I

60Hz, CH3 (Blue): VDS,

CH4 (Green): I

DS

Figure 45 through Figure 48 show the voltage stress on the output rectifier at startup with

V

VAC/

V

VAC/

the rated load condition.

Figure 45. 90

/ 60Hz, CH3 (Blue): VAK,

AC

CH4 (Green): I

AK

Figure 46. 115

60Hz, CH3 (Blue): VAK,

CH4 (Green): I

AK

Figure 47. 230

/ 60Hz, CH3 (Blue): VAK,

AC

CH4 (Green): I

AK

Figure 48. 265

60Hz, CH3 (Blue): VAK,

CH4 (Green): I

AK

Figure 49 throgh Figure 52 show the current stress on the output rectifier at startup with

V

VAC/

V

VAC/

the rated load condition.

Figure 49. 90

Figure 51. 230

/ 60Hz, CH3 (Blue): VAK,

AC

CH4 (Green): I

/ 60Hz, CH3 (Blue): VAK,

AC

CH4 (Green): I

AK

Figure 50. 115

Figure 52. 265

60Hz, CH3 (Blue): VAK,

CH4 (Green): I

60Hz, CH3 (Blue): VAK,

CH4 (Green): I

AK

3.11 Stress of the MOSFET & Rectifier

All measurements were conducted in observance of CISPR22 criteria.

Figure 53. EMI Results, Conducted Emission-Line at 230VAC, Full Load

(24V/1.25A; 6 Series, 2 Parallel LEDs)

4. Revision History

Rev. Date Description

1.0.0 5/22/12 Initial Release

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’ Guide. 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 neither 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. Fairchild warrantees that its products meet 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 reliability, function, or design. Either the applicable sales contract signed by Fairchild 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.

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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 LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

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FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT 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.

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Counterfeiting of semiconductor parts is a growing problem in the industry. All manufacturers of semiconductor products are experiencing 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 strong measures to protect ourselves and our customers from the proliferation of counterfeit parts. Fairchild strongly encourages customers to purchase 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 Fairchild's quality standards for handling and storage and provide access to Fairchild's full range of up-to-date technical and product information. Fairchild and our Authorized Distributors will stand behind all warranties and will appropriately address any warranty issues that may arise. Fairchild will not provide any warranty coverage or other assistance for parts bought from Unauthorized Sources. Fairchild is committed to combat this global problem and encourage our customers to do their part in stopping this practice by buying direct or from authorized distributors.

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U.S. origin products and products made with U.S. origin technology are subject to U.S Re-export laws. In the event of re-export, the user will be responsible to ensure the appropriate U.S. export regulations are followed.

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