Fairchild FEBFAN7688SJXA_CP14U306 User Manual

User Guide for

FEBFAN7688SJXA_CP14U306

Evaluation Board

306 W/12 V PC Application

with 12 VSB Module

Evaluation Board

Featured Fairchild Product:

FAN7688

Direct questions or comments

about this evaluation board to:

“Worldwide Direct Support”

Fairchild Semiconductor.com

© 2015 Fairchild Semiconductor Corporation 1 FEBFAN7688SJXA_CP14U306 • Rev. 1.1

Table of Contents

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

1.1. Features ............................................................................................................................ 3

2. Evaluation Board Specifications ............................................................................................... 4

3. Photograph ................................................................................................................................ 4

4. Printed Circuit Board (PCB) ..................................................................................................... 5

5. Schematic .................................................................................................................................. 6

6. Bill of Materials ........................................................................................................................ 7

7. Transformer and Winding Specifications ............................................................................... 12

7.1. Main Transformer (TX1) ............................................................................................... 12

7.2. Resonant Inductor (L4) .................................................................................................. 13

7.3. Pulse Transformer (TX2) ............................................................................................... 14

7.4. Current Transformer (TX4) ............................................................................................ 15

7.5. PFC Inductor (L3) .......................................................................................................... 16

7.6. 12 V Standby Transformer (TX3) .................................................................................. 17

7.7. EMI Choke (L1, L2)....................................................................................................... 18

8. Test Conditions & Test Equipment......................................................................................... 19

8.1. Features .......................................................................................................................... 19

9. Performance of Evaluation Board ........................................................................................... 20

9.1. Current Harmonic Test: .................................................................................................. 20

9.2. AC Trim Up & Trim Down............................................................................................ 23

9.3. Efficiency ....................................................................................................................... 23

9.4. Output Transient Response ............................................................................................ 24

9.5. 390 V to 358 V && 358 V to 390 V at Loading ............................................................ 25

9.6. 390 V to 358 V && 358 V to 390 V at Vrms ................................................................ 25

9.7. Hold up Time ................................................................................................................. 25

9.8. AC Cycle Drop ............................................................................................................... 26

9.9. AC Transient .................................................................................................................. 26

9.10. Surge & ESD .................................................................................................................. 27

9.11. EMI Conduction ............................................................................................................. 27

10. Revision History ..................................................................................................................... 28

© 2015 Fairchild Semiconductor Corporation 2 FEBFAN7688SJXA_CP14U306 • Rev. 1.1

This user guide supports the 306 W evaluation board for the 80Plus Platinum solution
based on a Continuous Conduction Mode (CCM) PFC and LLC convertor using the
FAN6982 with the FAN7688. It should be used in conjunction with the FAN7688
datasheet as well as Fairchild’s application notes and technical support team. Please visit
Fairchild’s website at www.fairchildsemi.com.

1. Introduction

The LLC converter in this Evaluation Board (EVB) is controlled by the FAN7688; it’s a
16-pin controller and locates in secondary side. The FAN7688 includes PFM and PWM
controls to optimization efficiency for all loading, its combine advantage SR control
improves efficiency. It employs a current mode control technique based on charge
control; this provides a better control-to-output and line-to-output transfer function of the
power stage, simplifying the feedback loop design while allowing true input power limit
capability. The PFC is controlled by the FAN6982, based on Continuous Conduction
Mode (CCM), which employs leading edge modulation for average current control and
has a number of advanced features for better performance and reliability.

1.1. Features

LLC:

 Secondary Side PFM Controller with Synchronous Rectifier Control
 Charge Current Control for better Transient Response and Simplified Feedback Loop

Design

 Adaptive Synchronous Rectification Control with Dual Edge Tracking
 Closed Loop Soft-Start
 Green Functions to Improve Light Load Efficiency

- Symmetric PWM Control at Light Load to Limit the Switching Frequency while

Reducing Switching Losses

- Disabling SR During Light Load Operation

 Complete Protection Functions with Auto-Restart
PFC:

 Continuous Conduction Mode and Average-Current-Mode Control
 Power-On Sequence Control
 Brownout Protection
 Fulfills Class-D Requirements of IEC 61000-3-2
 Universal AC Input Voltage
 Efficiency Optimization by External Output Voltage Adjustable Circuit

© 2015 Fairchild Semiconductor Corporation 3 FEBFAN7688SJXA_CP14U306 • Rev. 1.1

Description

Symbol

Value

Comments

Output Power

PO

306 W

Efficiency

Eff, η

Meet 80PLUS Platinum

Input Voltage

VAC

90~264 V

Input Frequency

47~63 Hz

PFC Output Voltage

V

PFC

356 V / 392 V

Output Voltage

V

OUT

12 V

100% Load = 300 W

12 V Standby Output

V

12VSB

12 V

100% Load = 6 W

Brown-In / Out Voltage

VAC

85 V / 73 V

PFC Frequency

fSW

65 kHz

LLC Frequency

f

LLC

39 k~150 kHz

EVB Size

L * W * H

145 mm*122 mm*48 mm

Does not include the

metal case

PFC

LLC

Standby

AC Input

DC Ounput

2. Evaluation Board Specifications

All data for this table was measured at an ambient temperature of 25°C.

Table 1. Summary of Features and Performance

3. Photograph

© 2015 Fairchild Semiconductor Corporation 4 FEBFAN7688SJXA_CP14U306 • Rev. 1.1

Figure 1. Top View of Evaluation Board (EVB does not include the metal case)

4. Printed Circuit Board (PCB)

Figure 2. Top Side of Evaluation Board

Figure 3. Bottom Side of Evaluation Board

© 2015 Fairchild Semiconductor Corporation 5 FEBFAN7688SJXA_CP14U306 • Rev. 1.1

5. Schematic

Figure 4. Evaluation Board Schematic

© 2015 Fairchild Semiconductor Corporation 6 FEBFAN7688SJXA_CP14U306 • Rev. 1.1

FEBFAN7688SJXA_CP14U306 BOM (PLM0320 REV.3)

Item

Reference

Qty.

Part No.

Value

Description

Manufacturer

1

JP

1

JUMPER WIRE 0.6ψ

2

C13

1 47 pF

C0603 X7R ±10% 50 V

3 C42

1 100 pF

C0603 X7R ±10% 50 V

4 C38

1 470 pF

C0603 X7R ±10% 50 V

5

C51

1 680 pF

C0603 X7R ±10% 50 V

6

C21, C35, C46,
C50, C64, C65,

C66, C67, C73

9 1 nF

C0603 X7R ±10% 50 V

7

C24

1 2.2 nF

C0603 X7R ±10% 50 V

8

C40, C41

2 3.3 nF

C0603 X7R ±10% 50 V

9 C47

1 4.7 nF

C0603 X7R ±10% 50 V

10

C31, C52

2 47 nF

C0603 X7R ±10% 50 V

11

C33, C34

2 10 nF

C0603 X7R ±10% 50 V

12

C39

1 22 nF

C0603 X7R ±10% 50 V

13

C20, C36, C37

3 100 nF

C0603 X7R ±10% 50 V

14

C48

1 220 nF

C0603 X7R ±10% 50 V

15

C32, C49

2 470 nF

C0603 X7R ±10% 16 V

16

C57, C58, C59,
C60, C61, C62,
C63, C68, C69,
C70, C71, C72,

C74

13 1 μF

C0603 X7R ±10% 50 V

17

C8

1 1 μF

C0805 X7R ±10% 50 V

18

C23

1 10 μF

C0805 X7R ±10% 25 V

19

C43

1 22 μF

C0805 X7R ±10% 25 V

20

R11, R16, R21

3 0 Ω

R0603 ±1%

21

R30, R31

2 2.2 Ω

R0603 ±1%

22

R10, R15, R20,

R58

4 10 Ω

R0603 ±1%

23

R26

1 17.4 Ω

R0603 ±1%

24

R25

1 42.2 Ω

R0603 ±1%

25

R8

1 51 Ω

R0805 ±1%

26

R69, R70, R71,

R72

4 100 Ω

R0603 ±1%

27

R19, R24, R112

3 220 Ω

R0603 ±1%

28

R107

1 330 Ω

R0603 ±1%

29

R41

1 1.24 KΩ

R0603 ±1%

30

R63

1 1.5 KΩ

R0603 ±1%

31

R90, R93

2 2 KΩ

R0603 ±1%

32

R111

1 2.2 KΩ

R0603 ±1%

33

R34

1 3 KΩ

R0603 ±1%

6. Bill of Materials

© 2015 Fairchild Semiconductor Corporation 7 FEBFAN7688SJXA_CP14U306 • Rev. 1.1

FEBFAN7688SJXA_CP14U306 BOM (PLM0320 REV.3)

Item

Reference

Qty.

Part No.

Value

Description

Manufacturer

34

R64

1 3.3 KΩ

R0603 ±1%

35

R60, R105

2 4.7 KΩ

R0603 ±1%

36

R95, R96

2 4.99 KΩ

R0603 ±1%

37

R40

1 5.1 KΩ

R0603 ±1%

38

R55

1 6.98 KΩ

R0603 ±1%

39

R92, R94

2 8.25 KΩ

R0603 ±1%

40

R38, R65, R87,

R108, R117,

R118

6 10 KΩ

R0603 ±1%

41

R89

1 12 KΩ

R0603 ±1%

42

R120

1 12.4 KΩ

R0603 ±1%

43

R115

1 13.3 KΩ

R0603 ±1%

44

R88, R106, R114

3 15 KΩ

R0603 ±1%

45

R12, R17, R22,
R32, R33, R39,

R54, R57, R102,

R104, R110

11 20 KΩ

R0603 ±1%

46

R68, R101

2 24.9 KΩ

R0603 ±1%

47

R59, R119

2 27 KΩ

R0603 ±1%

48

R52

1 27.4 KΩ

R0603 ±1%

49

R51

1 36 KΩ

R0603 ±1%

50

R37

1 38.3 KΩ

R0603 ±1%

51

R44

1 43.2 KΩ

R0603 ±1%

52

R103

1 47 KΩ

R0603 ±1%

53

R66

1 51 KΩ

R0603 ±1%

54

R129

1 73.2 KΩ

R0603 ±1%

55

R122, R126

2 75 KΩ

R0603 ±1%

56

R125

1 91 KΩ

R0603 ±1%

57

R99

1 147 KΩ

R0603 ±1%

58

R67, R97, R98,

R127

4 200 KΩ

R0603 ±1%

59

R56

1 357 KΩ

R0603 ±1%

60

R130 (Parallel

with R55)

1 1 MΩ

R0603 ±5%

61

R113, R116,

R121, R128

4 4.3 MΩ

R0603 ±5%

62

R47

1 0 Ω

R0805 ±1%

63

R61

1 10 KΩ

R0805 ±1%

64

R50

1 200 KΩ

R0805 ±1%

65

R49

1 3 KΩ

R1206 ±1%

66

R45, R46

2 100 KΩ

R1206 ±1%

67

R1, R2

2 470 KΩ

R1206 ±1%

© 2015 Fairchild Semiconductor Corporation 8 FEBFAN7688SJXA_CP14U306 • Rev. 1.1

FEBFAN7688SJXA_CP14U306 BOM (PLM0320 REV.3)

Item

Reference

Qty.

Part No.

Value

Description

Manufacturer

68

R13, R14

2 499 KΩ

R1206 ±1%

69

R3, R4, R123,

R124

4 1 MΩ

R1206 ±5%

70

R5, R6

2 3 MΩ

R1206 ±5%

71

R9A, R9B

2 0.15 Ω

R2512 ±1% 2 W

72

R100

1 10 KΩ

VR

73

C1

1 0.68 μF

X2 Capacitor 275 V ±10%

(11.5*19.5*17.5 mm

Pitch=15 mm)

74

C2

1 0.47 μF

X2 Capacitor 275 V ±10%

(18*8.5*16.5 mm,

Pitch=15 mm)

75

C53, C54

2

CD12-E2GA222MYASA

2.2 pF

Y1 Capacitor 250 V ±20%

UNIVERSE

CONDENSER

76

C3, C4

2 0.22 pF

Y1 Capacitor 250 V ±20%

77

C9

1 4.7 pF

Y1 Capacitor 250 V ±20%

(19x8x10 mm)

78

C10

1

MP3S104J0630DB1151H

0.1 μF

MP3S Capacitor DC630V

FUH BANG

79

C25

1 22 μF

Electrolytic Capacitor 50 V

105°C 5*11 mm LHK

HONJU

80

C29

1 220 μF

Electrolytic Capacitor 16 V

105°C 6.3*11 mm GF

SAMXON

81

C7

1 270 μF

Electrolytic Capacitor

450 V 105°C 25*45 mm LP

SAMXON

82

C27

1 470 μF

Solid Capacitor 16 V

8*11.5 mm ULR

HE SHEN TANG

83

C28

1 1000 μF

Electrolytic Capacitor 16 V

105°C 8*18 mm

84

C17, C18, C19

3 2200 μF

Electrolytic Capacitor 16 V

105°C 10*25 mm

85

C16

1 470 μF

Solid Capacitor 16 V

10*11.5 mm PSF

HE SHEN TANG

86

C5

1

TF105K2Y159L270D9R

1 μF

MTF Capacitor 450 V

±10%

KENJET

TECHNOLOGY

87

BD1

1

DFB2560

Bridge 25 A/600 V

TS-6P

Fairchild

88

D1

1

ISL9R860P2

Diode 8 A/600 V TO-220

Fairchild

89

D10

1

UF4007

Diode 1 A/1000 V DO-41

Fairchild

90

D12

1

1N4935

Diode 1 A/200 V DO-41

Fairchild

91

D14

1

EGP30D Diode 3 A/200 V

Fairchild

92

D19, D20, D21,

D22

4

1N4148WS

Diode SOD-32F

Fairchild

93

D2

1

S3J Diode 3 A/600 V SMC

Fairchild

94

D3, D4, D5, D11,

D15, D16, D17,

D18

8

LL4148

Diode 200 mA/100 V

SOD80

Fairchild

© 2015 Fairchild Semiconductor Corporation 9 FEBFAN7688SJXA_CP14U306 • Rev. 1.1