參數(shù)資料
型號(hào)： AN-30
英文描述： TOPSwitch-GX Forward Design Methodology
中文描述： 的TOPSwitch - GX系列正向設(shè)計(jì)方法
文件頁數(shù)： 37/40頁
文件大小： 311K
代理商： AN-30
AN-30
37
B
12/02
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ACDC_TOPGXForward_Rev_1.03_061802
Copyright Power Integrations Inc. 2002
INPUT
INFO
OUTPUT
UNIT
ACDC_TOPGXFwd_061802_r103.xls: TOPSwitch-GX Forward Transformer
Design Spreadsheet
OUTPUT VOLTAGE AND CURRENT
EP12 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
4
Amps
Auxiliary output current
VIND1
Volts
Independant output voltage
IND1
Amps
Independent output current
PO
147.6
Watts
Total output power
ENTER APPLICATION VARIABLES
VACMIN
90
AC volts
Minimum AC input voltage. Input voltage doubler circuit is assumed.
VACMAX
132
AC volts
Maximum AC input voltage. Input voltage doubler circuit is assumed.
VMIN
188 Volts
Minimum DC Bus voltage at low line input
VMAX
373 Volts
Maximum DC Bus voltage at high line input
CIN
165
uFarads
Equivalent bulk input capacitance. Input voltage doubler circuit is assumed.
fL
50
Hz
Input AC line frequency
tc
3.0
mSeconds Estimate input bridge diode conduction time
th
16.0
mSeconds Minimum required hold-up time from VDROPOUT to VHOLDUP
EFF
0.75
Efficiency estimate to determine minimum DC Bus voltage
VHOLDUP
188 Volts
DC Bus voltage at start of hold-up time (default 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
KDI
0.15
Maximum output current ripple factor at maximum DC Bus voltage
REF AUX1
1
DC Stack
Enter one ('1') for DC stacked , zero ('0') Independent winding
ENTER TOPSWITCH VARIABLES
TOPSwitch
top247
Universal
Doubled 115V/230V
Chosen Device
TOP247
Power Out
-
165W
ILIMIT
3.348
3.852
Amps
From TOPSwitch-GX datasheet
fS
124000
132000
Hertz
From TOPSwitch-GX+H76 datasheet
KI
0.81
Ilimit reduction (KI=1.0 for default ILIMIT, KI <1.0 for lower ILIMIT)
RX
7.78 kOhm
Maximum current limit resistance to ensure KI >= 0.81 setting
ILIMITEXT
2.712 Amps
External current limit
VDS
8.1 Volts
TOPSwitch-GX average on-state Drain to Source Voltage
DIODE Vf SELECTION
VDMAIN
0.5 Volts
Main output rectifiers forward voltage drop (Schottky)
VDMAINMA
0.5 Volts
Magamp output rectifiers forward voltage drop (Schottky)
VDAUX1
0.7 Volts
Auxiliary output rectifiers forward voltage drop (Ultrafast)
VDIND1
0 Volts
Independent output rectifiers forward voltage drop (Schottky)
VDB
0.7 Volts
Bias output rectifier conduction drop
BRIDGE RECTIFIER DIODE SELECTION
VPIVAC
467 Volts
Maximum voltage across Bridge rectifier diode
IDAVBR
0.773 Amps
Average Bridge Rectifier Current
TRANSFORMER CORE SELECTION
Core Type
eer28l
Core
EER28L
P/N:
PC40EER28L-Z
Bobbin
EER28L_BO
P/N:
BEER-28L-1112CPH
AE
0.814 cm^2
Core Effective Cross Sectional Area
LE
7.55 cm
Core Effective Path Length
AL
2520 nH/T^2
Ungapped Core Effective Inductance
BW
21.8 mm
Bobbin Physical Winding Width
LG MAX
0.02 mm
Maximum actual gap when zero gap specified
R FACTOR
9%
9% %
Percentage of total PS losses lost in transformer windings; default 10%
M
3.0
mm
Transformer margin
L
0.80
Transformer primary layers
NMAIN
3
Main rounded turns
TRANSFORMER DESIGN PARAMETERS
NP
45
45
Primary rounded turns
NB
6
Bias turns to maintain 8V minimum input voltage, light load
NAUX1
4
Auxiliary rounded turns (DC stacked on Main winding)
VAUX1 ACTUAL
11.63 Volts
Approx. Aux output voltage with NAUX1 = 4 Turns and DC stack
NIND1
0
Independent rounded turns (separate winding)
VIND1 ACTUAL
0.00 Volts
Approximate Independent output voltage with NIND1 = 0 turns
BM
1816
Gauss
Maximum operating flux density at minimum switching frequency
BP
2884
Gauss
Maximum peak flux density at minimum switching frequency
LP MIN
3.419 mHenries
Minimum primary magnetizing inductance (assumes LGMAX=20um)
IMAG
0.189
Amps
Peak magnetizing current at minimum input voltage
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