10/12/2012 5:03:13 PM 1/3
1
ACDC_LinkSwitch-II_0706
12; Rev.1.14; Copyright
Power Integrations 2011
INPU
T
INF
O
OUTP
UT UNIT
ACDC_LinkSwitch-II_070612_Rev1-14;
LinkSwitch-II Discontinuous Flyback
Transformer Design Spreadsheet
2
ENTER APPLICATION VARIABLES
Design Title
3
VACMIN 21 21.00 V Minimum AC Input Voltage
4
VACMAX 265 265.00 V Maximum AC Input Voltage
5
fL 60 60.00 Hz AC Mains Frequency
6
VO 9.00 9.00 V Output Voltage (at continuous power)
7
IO 0.04 0.04 A
Power Supply Output Current (corresponding to peak
power)
8
Power 0.36 W Continuous Output Power
9
n 0.70 0.70
Efficiency Estimate at output terminals. Under 0.7 if no
better data available
10
Z 0.50
Z Factor. Ratio of secondary side losses to the total
losses in the power supply. Use 0.5 if no better data
available
11
tC 3.00 ms Bridge Rectifier Conduction Time Estimate
12
Add Bias Winding
NO
NO
Choose Yes to add a Bias winding to power the
LinkSwitch-II.
13
CIN 9.40 uF Input Capacitance
14
15
ENTER LinkSwitch-II VARIABLES
16
Chosen Device
LNK603
LNK603 Chosen LinkSwitch-II device
17
Package
DG
DG Select package (PG, GG or DG)
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ILIMITMIN 0.19 A Minimum Current Limit
19
ILIMITTYP 0.20 A Typical Current Limit
20
ILIMITMAX 0.22 A Maximum Current Limit
21
FS 66.00 66.00 kHz Typical Device Switching Frequency at maximum power
22
VOR 13.06 V Reflected Output Voltage (VOR < 135 V Recommended)
23
VDS 10.00 V LinkSwitch-II on-state Drain to Source Voltage
24
VD 0.50 V Output Winding Diode Forward Voltage Drop
25
KP 2.09 Ensure KDP > 1.3 for discontinuous mode operation
26
27
FEEDBACK WINDING PARAMETERS
28
NFB 15.00 Feedback winding turns
29
VFLY 8.91 V
Flyback Voltage - Voltage on Feedback Winding during
switch off time
30
VFOR 7.30 V
Forward voltage - Voltage on Feedback Winding during
switch on time
31
32
BIAS WINDING PARAMETERS
33
VB N/A V
Bias Winding Voltage. Ensure that VB > VFLY. Bias
winding is assumed to be AC-STACKED on top of
Feedback winding
34
NB N/A Bias Winding number of turns
35
REXT N/A k-ohm
Suggested value of BYPASS pin resistor (use standard
5% resistor)
36
DESIGN PARAMETERS
37
DCON 4.50 us Output diode conduction time
38
TON 5.59 us
LinkSwitch-II On-time (calculated at minimum
inductance)
39
RUPPER 23.68 k-ohm Upper resistor in Feedback resistor divider
40
RLOWER 6.34 k-ohm Lower resistor in resistor divider
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42
ENTER TRANSFORMER CORE/CONSTRUCTION VARIABLES
43
Core Type
44
Core
EE10
EE10 #N/A
45
Bobbin EE10_BOBBIN Generic EE10_BOBBIN
46
AE 12.10 mm^2 Core Effective Cross Sectional Area
47
LE 26.10 mm Core Effective Path Length
48
AL 850.00 nH/tur Ungapped Core Effective Inductance
49
BW 6.60 mm Bobbin Physical Winding Width
10/12/2012 5:03:13 PM 2/3
1
ACDC_LinkSwitch-II_0706
12; Rev.1.14; Copyright
Power Integrations 2011
INPU
T
INF
O
OUTP
UT UNIT
ACDC_LinkSwitch-II_070612_Rev1-14;
LinkSwitch-II Discontinuous Flyback
Transformer Design Spreadsheet
50
M 0.00 mm
Safety Margin Width (Half the Primary to Secondary
Creepage Distance)
51
L 3.00 Number of Primary Layers
52
NS 16.00
Number of Secondary Turns. To adjust Secondary
number of turns change DCON
53
54
DC INPUT VOLTAGE PARAMETERS
55
VMIN 10.70 10.70 V Minimum DC bus voltage
56
VMAX 374.77 V Maximum DC bus voltage
57
58
CURRENT WAVEFORM SHAPE PARAMETERS
59
DMAX 0.37 Maximum duty cycle measured at VMIN
60
IAVG 0.73 A Input Average current
61
IP 0.19 A Peak primary current
62
IR 0.19 A Primary ripple current
63
IRMS 0.08 A Primary RMS current
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65
TRANSFORMER PRIMARY DESIGN PARAMETERS
66
LPMIN Warni 314.61 uH
!!! Warning. Minimum Primary inductance is too low and
may result in SOA limits being exceeded. Increase
minimum inductance by designing to higher power.
67
LPTYP 331.17 uH Typical Primary inductance
68
LP_TOLERANCE 5.00 5.00 % Tolerance in primary inductance
69
NP 22.00
Primary number of turns. To adjust Primary number of
turns change BM_TARGET
70
ALG 684.23 nH/tur Gapped Core Effective Inductance
71
BM_TARGET 2500.00 Gaus Target Flux Density
72
BM 2488.12 Gaus
Maximum Operating Flux Density (calculated at nominal
inductance), BM < 2500 is recommended
73
BP 2873.78 Gaus
Peak Operating Flux Density (calculated at maximum
inducatnce and max current limit), BP < 3000 is
recommended
74
BAC 1244.06 Gaus
AC Flux Density for Core Loss Curves (0.5 X Peak to
Peak)
75
ur 145.90 Relative Permeability of Ungapped Core
76
LG Warni 0.01 mm
!!! Warning. Gap lengths less than 0.1 mm not
recommended
77
BWE 19.80 mm Effective Bobbin Width
78
OD 0.90 mm Maximum Primary Wire Diameter including insulation
79
INS 0.08
Estimated Total Insulation Thickness (= 2 * film
thickness)
80
DIA 0.82 mm Bare conductor diameter
81
AWG 20.00
Primary Wire Gauge (Rounded to next smaller standard
AWG value)
82
CM 1024.00 Cmils Bare conductor effective area in circular mils
83
CMA Info
13276.8
3
Cmils/
!!! Info. CMA is on the higher side of recommenation but
design will work. Consider reducing primary layers if
possible
84
85
TRANSFORMER SECONDARY DESIGN PARAMETERS
86
Lumped parameters
87
ISP 0.26 A Peak Secondary Current
88
ISRMS 0.10 A Secondary RMS Current
89
IRIPPLE 0.09 A Output Capacitor RMS Ripple Current
90
CMS 19.20 Cmils Secondary Bare Conductor minimum circular mils
91
AWGS 37.00
Secondary Wire Gauge (Rounded up to next larger
standard AWG value)
92
93
VOLTAGE STRESS PARAMETERS