EPR-31 Datasheet, PDF (24/36 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP-31 Multiple Output 180 W AC-DC Power

EPR-31 – Multi Output, 180 W, PC Main Power Supply
01-Feb-05
8 Transformer Spreadsheets
ACDC_TOPGXForward_Rev_1.06_061003
Copyright Power Integrations Inc. 2003 _{INPUT INFO OUTPUT}
ACDC_TOPGXFwd_061003_r106.xls:
TOPSwitch-GX Forward Transformer Design
UNIT Spreadsheet
OUTPUT VOLTAGE AND CURRENT
EP31 PC Main power supply
VMAIN
5
Volts
Main output voltage
IMAIN
12
Amps Main output current
VMAINMA
3.3
Volts
Magamp output voltage
IMAINMA
12
Amps Magamp output current
VAUX1
12
Volts
Auxiliary output voltage
IAUX1
7
Amps Auxiliary output current
VIND1
Volts
Independant output voltage
IND1
Amps Independent output current
PO
183.6 Watts Total output power
ENTER APPLICATION VARIABLES
Minimum AC input voltage. Input voltage doubler
VACMIN
90
AC volts circuit is assumed.
Maximum AC input voltage. Input voltage doubler
VACMAX
132
AC volts circuit is assumed.
VMIN
198 Volts
Minimum DC Bus voltage at low line input
VMAX
373 Volts
Maximum DC Bus voltage at high line input
Equivalent bulk input capacitance. Input voltage
CIN
235
uFarads doubler circuit is assumed.
fL
50
Hz
Input AC line frequency
tc
3.0
mSeconds Estimate input bridge diode conduction time
Minimum required hold-up time from VDROPOUT
th
16.0
mSeconds to VHOLDUP
Efficiency estimate to determine minimum DC Bus
EFF
0.75
voltage
DC Bus voltage at start of hold-up time (default
VHOLDUP
198 Volts
VMIN)
VDROPOUT
132
132 Volts
DC Bus Voltage at end of hold-up time
DMAX GOAL
0.7
0.70
Maximum duty cycle at DC dropout voltage
VDSOP
580 Volts
Maximum operating drain voltage
Maximum output current ripple factor at maximum
KDI
0.15
DC Bus voltage
Enter one ('1') for DC stacked , zero ('0')
REF AUX1
1
DC Stack
Independent winding
ENTER TOPSWITCH VARIABLES
TOPSwitch
top249
Doubled 115V/230V
Chosen Device
TOP249
Power Out
250
ILIMIT
5.022 5.778
Amps From TOPSwitch-GX datasheet
fS
124000 132000
Hertz From TOPSwitch-GX+H76 datasheet
Ilimit reduction (KI=1.0 for default ILIMIT, KI <1.0
KI
0.82
for lower ILIMIT)
Maximum current limit resistance to ensure KI >=
RX
7.61 kOhm 0.82 setting
ILIMITEXT
4.118 Amps External current limit
TOPSwitch-GX average on-state Drain to Source
VDS
8.2 Volts
Voltage
DIODE Vf SELECTION
Main output rectifiers forward voltage drop
VDMAIN
0.5 Volts
(Schottky)
Magamp output rectifiers forward voltage drop
VDMAINMA
0.5 Volts
(Schottky)
Auxiliary output rectifiers forward voltage drop
VDAUX1
0.7 Volts
(Ultrafast)
Independent output rectifiers forward voltage drop
VDIND1
0 Volts
(Schottky)
VDB
0.7 Volts
Bias output rectifier conduction drop
BRIDGE RECTIFIER DIODE SELECTION
VPIVAC
IDAVBR
467 Volts
0.962 Amps
Maximum voltage across Bridge rectifier diode
Average Bridge Rectifier Current
Power Integrations
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