EPR-89 Datasheet, PDF (13/32 Pages) Power Integrations, Inc. – Engineering Prototype Report for 2.0 W CV Adapter using LNK362P

08-Nov-2005
EP-89 6.2 V, 322 mA Adapter
8 Design Spreadsheets
ACDC_LinkSwitch
-XT_101205;
Rev.1.2;
INPUT
Copyright Power
Integrations 2005
ENTER APPLICATION
VARIABLES
VACMIN
85
VACMAX
265
fL
50
INFO
VO
6.20
IO
CC Threshold
Voltage
Output Cable
Voltage Resistance
PO
Feedback Type
0.32
0.00
Opto
Add Bias Winding No
Clampless design
(LNK 362 only)
Yes
n
0.63
Z
0.50
tC
2.90
CIN
6.60
Input Rectification
Type
F
ENTER LinkSwitch-XT
VARIABLES
LinkSwitch-XT
LNK362
Chosen Device
ILIMITMIN
ILIMITMAX
fSmin
I^2fmin
VOR
VDS
VD
KP
77.00
0.75
Caution
LNK362
OUTPUT
UNIT
ACDC_LinkSwitch-XT_101205_Rev1-2.xls;
LinkSwitch-XT Continuous/Discontinuous Flyback
Transformer Design Spreadsheet
Volts
Volts
Hertz
Volts
Amps
Volts
EP89
Minimum AC Input Voltage
Maximum AC Input Voltage
AC Mains Frequency
Output Voltage (main) (For CC designs enter upper
CV tolerance limit)
Power Supply Output Current (For CC designs enter
upper CC tolerance limit)
Voltage drop across sense resistor.
0.17 Ohms
2.00 Watts
Opto
No
Clampless
0.63
0.5
mSeconds
uFarads
F
Enter the resistance of the output cable (if used)
Output Power (VO x IO + CC dissipation)
Enter 'BIAS' for Bias winding feedback and 'OPTO' for
Optocoupler feedback
Enter 'YES' to add a Bias winding. Enter 'NO' to
continue design without a Bias winding. Addition of
Bias winding can lower no load consumption
!!! Caution. For designs above 2 W and no Bias
winding, Verify peak Drain Voltage and EMI
performance
Efficiency Estimate at output terminals.
Loss Allocation Factor (suggest 0.5 for CC=0 V, 0.75
for CC=1 V)
Bridge Rectifier Conduction Time Estimate
Input Capacitance
Choose H for Half Wave Rectifier and F for Full Wave
Rectification
LNK362
0.130 Amps
0.150 Amps
124000 Hertz
2199 A^2Hz
77 Volts
10 Volts
0.75 Volts
1.00
User selection for LinkSwitch-XT
Minimum Current Limit
Maximum Current Limit
Minimum Device Switching Frequency
I^2f (product of current limit squared and frequency is
trimmed for tighter tolerance)
VOR > 90V not recommended for Clampless designs
with no Bias windings. Reduce VOR below 90V
LinkSwitch-XT on-state Drain to Source Voltage
Output Winding Diode Forward Voltage Drop
Ripple to Peak Current Ratio (0.6 < KP < 6.0)
Page 13 of 32
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