11/30/2012 9:19:51 PM 1/4
1
ACDC_LinkSwitch-PH_101
612; Rev.1.9; Copyright
Power Integrations 2012
INPUT INFO OUTP UNIT
LinkSwitch-PH_101612: Flyback
Transformer Design Spreadsheet
2
ENTER APPLICATION VARIABLES
Design Title
3
Dimming required NO NO
Select 'YES' option if dimming is required.
Otherwise select 'NO'.
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VACMIN 90 V Minimum AC Input Voltage
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VACMAX 265 V Maximum AC input voltage
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fL 50 Hz AC Mains Frequency
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VO 40.00 40 V Typical output voltage of LED string at full load
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VO_MAX 44.00 V Maximum expected LED string Voltage.
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VO_MIN 36.00 V Minimum expected LED string Voltage.
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V_OVP 48.40 V Over-voltage protection setpoint
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IO 0.70 0.70 A Typical full load LED current
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PO 28.0 W Output Power
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n 0.8
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VB 20 V Bias Voltage
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ENTER LinkSwitch-PH VARIABLES
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LinkSwitch-PH LNK419 LNK419 Univers 115 Doubled/230V
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Chosen Device LNK419
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Current Limit Mode RED RED
Select "RED" for reduced Current Limit mode or
"FULL" for Full current limit mode
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ILIMITMIN 2.35 A Minimum current limit
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ILIMITMAX 2.73 A Maximum current limit
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fS 66000 Hz Switching Frequency
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fSmin 62000 Hz Minimum Switching Frequency
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fSmax 70000 Hz Maximum Switching Frequency
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IV 38.7 uA V pin current
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RV 3.909 M-ohm Upper V pin resistor
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RV2 1.402 M-ohm Lower V pin resistor
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IFB 150.00 150.0 uA FB pin current (85 uA < IFB < 210 uA)
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RFB1 113.3 k-ohms FB pin resistor
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VDS 10 V LinkSwitch-PH on-state Drain to Source Voltage
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VD 0.50 V
Output Winding Diode Forward Voltage Drop
(0.5 V for Schottky and 0.8 V for PN diode)
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VDB 0.70 V Bias Winding Diode Forward Voltage Drop
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Key Design Parameters
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KP 0.45 0.45
Ripple to Peak Current Ratio (For PF > 0.9, 0.4 <
KP < 0.9)
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LP 1370 uH Primary Inductance
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VOR 80 V Reflected Output Voltage.
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Expected IO (average) 0.69 A Expected Average Output Current
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KP_VACMAX 0.64 Expected ripple current ratio at VACMAX
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TON_MIN 2.67 us Minimum on time at maximum AC input voltage
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PCLAMP 0.36 W Estimated dissipation in primary clamp
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ENTER TRANSFORMER CORE/CONSTRUCTION VARIABLES
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Core Type EF30 EF30 Transformer core
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Custom Core If using a custom core - Enter part number here
48
AE 0.6 cm^2 Core Effective Cross Sectional Area
11/30/2012 9:19:51 PM 2/4
1
ACDC_LinkSwitch-PH_101
612; Rev.1.9; Copyright
Power Integrations 2012
INPUT INFO OUTP UNIT
LinkSwitch-PH_101612: Flyback
Transformer Design Spreadsheet
49
LE 6.7 cm Core Effective Path Length
50
AL 1410 nH/T^2 Ungapped Core Effective Inductance
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BW 17.3 mm Bobbin Physical Winding Width
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M 0 mm
Safety Margin Width (Half the Primary to
Secondary Creepage Distance)
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L 3 Number of Primary Layers
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NS 62 Number of Secondary Turns
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DC INPUT VOLTAGE PARAMETERS
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VMIN 127 V Peak input voltage at VACMIN
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VMAX 375 V Peak input voltage at VACMAX
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CURRENT WAVEFORM SHAPE PARAMETERS
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DMAX 0.41 Minimum duty cycle at peak of VACMIN
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IAVG 0.37 A Average Primary Current
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IP 1.54 A
Peak Primary Current (calculated at minimum
input voltage VACMIN)
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IRMS 0.59 A
Primary RMS Current (calculated at minimum
input voltage VACMIN)
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TRANSFORMER PRIMARY DESIGN PARAMETERS
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LP 1370 uH Primary Inductance
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NP 122 Primary Winding Number of Turns
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NB 32 Bias Winding Number of Turns
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ALG 91 nH/T^2 Gapped Core Effective Inductance
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BM 2863 Gauss Maximum Flux Density at PO, VMIN (BM<3100)
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BP 3464 Gauss Peak Flux Density (BP<3700)
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BAC 644 Gauss
AC Flux Density for Core Loss Curves (0.5 X
Peak to Peak)
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ur 1253 Relative Permeability of Ungapped Core
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LG 0.77 mm Gap Length (Lg > 0.1 mm)
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BWE 51.9 mm Effective Bobbin Width
80
OD 0.42 mm
Maximum Primary Wire Diameter including
insulation
81
INS 0.06 mm
Estimated Total Insulation Thickness (= 2 * film
thickness)
82
DIA 0.36 mm Bare conductor diameter
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AWG 28 AWG
Primary Wire Gauge (Rounded to next smaller
standard AWG value)
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CM 161 Cmils Bare conductor effective area in circular mils
85
CMA 272 Cmils/
Primary Winding Current Capacity (200 < CMA <
600)
86
LP_TOL 10 Tolerance of primary inductance
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TRANSFORMER SECONDARY DESIGN PARAMETERS (SINGLE OUTPUT EQUIVALENT)
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Lumped parameters
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ISP 3.03 A Peak Secondary Current
91
ISRMS 1.34 A Secondary RMS Current
92
IRIPPLE 1.14 A Output Capacitor RMS Ripple Current