EPR-12 Datasheet, PDF (25/40 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP-12 - 145 W PC Forward Converter with TOP247 and 10 W 5 V Output Standby Flyback with TNY266

01-Feb-05
EPR-12 – PC Forward Converter with Standby Flyback Power Supply
8 PIXls Design Spreadsheet
ACDC_TOPGXForward_Rev_1.03_061
802 Copyright Power Integrations Inc.
2002
INPUT
INFO
OUTPUT VOLTAGE AND CURRENT
VMAIN
5
IMAIN
12
VMAINMA
3.3
IMAINMA
12
VAUX1
12
IAUX1
4
VIND1
IND1
PO
OUTPUT
UNIT
Volts
Amps
Volts
Amps
Volts
Amps
Volts
Amps
147.6 Watts
ACDC_TOPGXFwd_061802_r103.xls:
TOPSwitch-GX Forward Transformer
Design Spreadsheet
EP12 PC Main power supply
Main output voltage
Main output current
Magamp output voltage
Magamp output current
Auxiliary output voltage
Auxiliary output current
Independent output voltage
Independent output current
Total output power
ENTER APPLICATION VARIABLES
VACMIN
VACMAX
VMIN
VMAX
CIN
fL
tc
th
EFF
VHOLDUP
VDROPOUT
DMAX GOAL
VDSOP
KDI
REF AUX1
ENTER TOPSWITCH VARIABLES
TOPSwitch
Chosen Device
ILIMIT
fS
KI
RX
ILIMITEXT
VDS
90
AC volts
Minimum AC input voltage. Input voltage
doubler circuit is assumed.
132
AC volts
Maximum AC input voltage. Input voltage
doubler circuit is assumed.
188 Volts
Minimum DC Bus voltage at low line input
373 Volts
Maximum DC Bus voltage at high line input
165
uFarads
Equivalent bulk input capacitance. Input
voltage doubler circuit is assumed.
50
Hz
Input AC line frequency
3.0
mSeconds Estimate input bridge diode conduction time
16.0
mSeconds
Minimum required hold-up time from
VDROPOUT to VHOLDUP
0.75
Efficiency estimate to determine minimum
DC bus voltage
188 Volts
DC Bus voltage at start of hold-up time
(default VMIN)
132
132 Volts
DC Bus Voltage at end of hold-up time
0.7
0.70
Maximum duty cycle at DC dropout voltage
580 Volts
Maximum operating drain voltage
0.15
Maximum output current ripple factor at
maximum DC Bus voltage
1
DC Stack
Enter one ("1") for DC stacked, zero ("0")
Independent winding
top247
TOP247
3.348
124000
3.852
132000
Power Out
0.81
Universal
-
Amps
Hertz
7.78 kOhm
2.712 Amps
8.1 Volts
Doubled 115V/230V
165 W
From TOPSwitch-GX datasheet
From TOPSwitch-GX+H76 datasheet
limit reduction (KI=1.0 for default ILIMIT, KI
<1.0 for lower ILIMIT)
Maximum current limit resistance to ensure
KI >= 0.81 setting
External current limit
TOPSwitch-GX average on-state Drain to
Source Voltage
Page 25 of 40
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