Download 24V 7.5A (195-265V, 132Khz)

Design
Warning
(Optimization
Done)
Design Report
ETD39/20/13
Vout 1: 24.00 V, 7.50 A
27T
CLAMP
5T
RTN
Vbias: 12.0 V, 0.006 A
Vin
3T
195-265 V
AC
EMI
&
Cin
D
Rectifier
L
TOP248Y
From Vout 1
CONTROL
UV/OV
ILim
C
S
X
Feedback
Secondary Zener
F
Design Results
Power Supply Input
Var
Value
Units
VACMIN
195
V
VACMAX
265
V
FL
50
Hz
TC
Z
N
VBRIDGE
IAVG
CIN
VMIN
VMAX
1.92
0.58
81.0
600
0.97
150.0
228.2
374.8
ms
Diode Conduction Time
Loss Allocation Factor
Efficiency Estimate
Diode Bridge Voltage Rating
Average Diode Bridge Current
Input Capacitance
Minimum DC Input Voltage
Maximum DC Input Voltage
%
V
A
µF
V
V
Device Variables
Var
Value
Device
TOP248Y
PO
180.07
VDRAIN
678
VDS
8.08
FS
132000
KRPKDP
0.72
Description
Min Input AC
Voltage.
Max Input AC
Voltage
Line
Frequency
Units
W
V
V
Hz
Description
PI Device Name
Total Output Power
Maximum Drain Voltage
Drain to Source Voltage
Switching Frequency
Continuous/Discontinuous
Operating Ratio
KI
1.00
KI Factor
ILIMITEXT 4.18
A
Device Current Limit
External Minimum
ILIMITMIN 4.18
A
Current Limit Minimum
ILIMITMAX 4.82
A
Current Limit Maximum
IP
4.01
A
Peak Primary Current
IRMS
1.66
A
Primary RMS Current
DMAX
0.38
Maximum Duty Cycle
RLS
3.0
MΩ
Line sense resistor
RLS2
22.0
kΩ
Line sense resistor
VZ
6.20
V
Zener Diode for Under-voltage Line sensing
Bias and Clamp Components Section
Var
Value
Units
Description
VB
12.0
V
Bias Voltage
IB
0.006
A
Bias Current
VDB
1.00
V
Bias Diode Forward Voltage Drop
PIVB
47
V
Bias Rectifier Max Peak Inverse Voltage
NB
2.5
Bias Winding Number of Turns
VCLO
200
V
Clamp Zener Voltage
PZ
5.1
W
Primary Zener Clamp Loss. See Errors, Warnings,
Information section for detail
Transformer Construction Parameters
Var
Value
Units
Description
Core/Bobbin ETD39/20/13
Core Type
Core Manuf. Generic
Core Manufacturer
Bobbin
Generic
Bobbin Manufacturer
Manuf.
LP
209
µH
Primary Inductance
NP
27.0
Primary Number of Turns
NB
2.5
Bias Winding Number of Turns
AWG
20
AWG
Primary Wire Gauge. See Errors, Warnings,
Information section for detail
CMA
616
Cmils/A Primary Winding Current Capacity
VOR
135.00
V
Reflected Output Voltage
BW
25.70
mm
Bobbin Winding Width
M
4.00
mm
Safety Margin Width
L
1.40
Primary Number of Layers
AE
125.00
mm²
Core Cross Sectional Area
ALG
287
nH/T²
Gapped Core Effective Inductance
BM
2484
Gauss
Maximum Flux Density
BP
2984
Gauss
Peak Flux density
BAC
896
Gauss
AC Flux Density for Core Loss
LG
0.486
mm
Estimated Gap Length
LL
1.6
µH
Primary Leakage Inductance
LSEC
30
nH
Secondary Trace Inductance
Output 1
Var
Value
Unit Descripti
s
on
VO
24.00
V
Output
IO
7.50
A
PIVS
93
V
ISP
21.38
A
ISRMS
DO
11.32
Undefin
ed
1200 x
3
8.48
A
CO
IRIPPL
E
Expect
ed
Lifetim
e
LPF
CPF
Voltage
Output
Current
Output
Rectifier
Maximum
Peak
Inverse
Voltage
Peak
Secondary
Current
Secondary RMS Current
Recommended Output Diode
µF
Output Capacitor
A
Output Capacitor RMS Ripple Current
45621
hr
Expected Lifetime of Output Capacitor
2.2 – 10
100 –
680
5.0
5
µH
µF
Post Filter Inductor
Post Filter Capacitor
NS
Rounde
d Down
NS
Rounde 24.00
d Down
VO
Rounde 5
d Up
NS
Rounde 24.00
d Up
VO
AWGS
13 - 17
Range
Feedback Circuit
Var
Value
RF1
1000.00
RF2
464.0
Rated
22.0
Voltage
Secondary Number of Turns
Rounded to Integer Secondary Number of Turns
V
Auxiliary Output Voltage for Rounded down to Integer
Secondary Number of Turns
Rounded to Next Integer Secondary Number of Turns
V
Auxiliary Output Voltage for Rounded up to Next
Integer Secondary Number of Turns
AW
G
Secondary Wire Gauge Range. See Errors,
Warnings, Information section for detail
Units
Ω
Ω
V
Description
Zener Biasing resistor
Zener Compensation resistor
Zener Rated Voltage
Zener
Test
Current
5.0
mA
Zener Test Current
High power flyback design.
Recommend split primary winding construction.
Zener clamp may require parallel resistor/capacitor.
High output current flyback design.
Use parallel low ESR output capacitors, reduce secondary ripple currents by
reducing VOR and KRP/KDP.
Errors, Warnings, Information
Description
Check Zener clamp
temperature.
Wire gauge is less than
recommended minimum.
Secondary wire gauge is
less than recommended
minimum (26 AWG).
Fix
Consider adding parallel RC to zener or move
to an RCD clamp, split primary "sandwich"
(L>1),
use lower switching frequency, reduce
reflected voltage (VOR) and minimize
secondary trace inductance (LSEC),
esp. low-voltage/high current outputs.
Consider a parallel winding technique (bifilar,
trifilar),
increase size of transformer (larger BW) or
reduce margin (M).
Consider a parallel winding technique (bifilar,
trifilar) for > 1.5 A outputs,
increase size of transformer (larger BW) or
reduce margin (M).
Show
me
Ref.
#
205
221
232