EPR-000008 – 1.2 W Universal Input Non-Isolated TNY254
23-April-2001
7.2 Spreadsheet
ACDC_TNY_Rev1.8_072699 INPUT
Copyright Power
OUTPUT
UNIT
ACDC_TNY_REV1_8_072699.xls: TinySwitch
Continuous/Discontinuous Flyback Transformer Design
Spreadsheet
Integrations, Inc. 1999
ENTER APPLICATION VARIABLES
Customer
VACMIN
77
V
V
Minimum AC Input Voltage
Maximum AC Input Voltage
AC Mains Frequency
VACMAX
265
25
fL
Hz
V
VO
12
Output Voltage
PO
1.2
0.65
0.1
3
W
Output Power
n
Efficiency Estimate
Z
Loss Allocation Factor
tC
mS
ꢀF
Bridge Rectifier Conduction Time Estimate
Input Filter Capacitor
CIN
6.8
MODE OF OPERATION
Continuous ('c') or
Discontinuous ('d')?
Continuous Mode Operation or Discontinuous Mode
Operation?
c
n
Continuous
ENTER TinySwitch Parameters
Universal
4 W
115/230 VAC
TinySwitch
ILIMITMIN
ILIMITMAX
fSmin
TNY254
5 W
0.23
A
A
Hz
V
Minimum Current Limit
0.28
40000
Maximum Current Limit
Minimum Frequency
VDS
10
Voltage Drop Between Drain to Source
ENTER Output Diode Parameters
Output Diode
VR
ID
VD
k
500
1
V
A
V
Diode Maximum Peak Repetitive Reverse Voltage
Diode Average Forward Current
1
Diode Forward Voltage Drop
0.8
Diode Peak to RMS Current Factor (k=0.9 for Schottky, k=0.8
for PN Diode)
Design Parameters
VMIN
VMAX
IP
51
375
V
V
A
Minimum DC Input Voltage
Maximum DC Input Voltage
Peak Primary Current
0.21
DMAX
0.252
Duty Cycle at Minimum DC Input Voltage
KRP
0.62
13.91
445.63
362
Ripple to Peak Current Ratio (0.6<KRP<1.0)
Reflected Output Voltage
Maximum Drain Voltage Estimate
Output Rectifier Peak Inverse Voltage
Minimum Primary Inductance
VOR
VDRAIN
PIVS
LP
V
V
V
1552
ꢀH
CURRENT WAVEFORM SHAPE PARAMETERS
IAVGmax
IAVGmin
IRMS
IR
0.04
0.00
0.07
0.13
0.22
0.14
0.10
0.09
0.24
A
A
A
A
A
A
A
A
A
Maximum Average Primary Current
Minimum Average Primary Current
Primary RMS Current
Primary Ripple Current
ISP
Maximum Peak Secondary Current
Secondary RMS current
ISRMS
IO
Power Supply Output Current
Output Capacitor RMS Ripple Current
Estimated Short Circuit Current
IRIPPLE
IOS
Power Integrations, Inc.
Page 10 of 20
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