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(yè)數(shù)： 29/40頁(yè)
文件大?。?/td> 311K
代理商： AN-30
AN-30
29
B
12/02
The external current-limit reduction factor is given by Equation (15) in AN-30
K
I
=
0.81
3.34
Set external current limit reduction factor
K
I
= 0.81
(KI, B35)
The external current limit is reduced from 3.34 A to 2.712 A using a current limit-program resistor. The external current limit
resistor is calculated by the spreadsheet as RX = 7.78 k
TOPSwitch switching frequency fs = 132 kHz
(RX, F36)
(FS, D34)
On the prototype board an 8.3 k
resistor was used. The larger value was required to compensate for the additional voltage drop
caused by the remote on-off circuit.
The spreadsheet also estimates the ON state drain to source voltage drop.
VDS = 8.1 V
(VDS, F38)
Step (j). Selection of the “R-FACTOR”
The R-Factor is an estimate of percentage of power lost in the transformer windings, diode and PC board trace resistance.
Typically this value is less than 10% for most well designed power supplies. Use this value if no better data are available.
R-Factor = 9%
(RFACTOR, B61)
Step (k). Selection of number of turns for transformer windings:
N
,
N
, N
,
N
The number of turns for all outputs are calculated by the spreadsheet. In EP-12 these values are as follows:
Number of turns on main winding
N
MAIN
= 3
Number of turns on Primary winding
P
= 45
Number of turns on auxiliary winding
N
AUX1
= 4
Number of bias winding turns
N
B
= 6
(NMAIN, F64)
(NP, F67)
(NAUX1, F69)
(NB, F68)
Check all outputs on prototype hardware to conform that they are within acceptable limits.
Step (l). Selection of Optocoupler and Transformer Core Parameters.
Selection of Optocoupler:
V
The bias winding should provide a minimum of 8 V on the collector of the photo transistor at the lowest operating voltage.
When no external under-voltage circuit is used the lowest operating voltage may be much lower than expected.
Increase bias turns to increase minimum bias voltage.
At higher input voltages the collector voltage should not exceed
V
, the collector to emitter breakdown voltage. The
spreadsheet calculates this maximum blocking voltage imposed on the optocoupler as:
V
CEO
= 49.8
(VCEO OPTO, F120)
Select an optocoupler with a high blocking voltage. Typically a 60 V (
V
CEO
) optocoupler is used.
Transformer core parameters:
M, L, BM, BP
Set safety margin M. Use 3 mm for margin wound with 115 VAC doubled input. Set to zero if triple insulated secondary
windings are used. In the EP-12 prototype 3 mm margin is selected.
Enter margin
M = 3 mm
(M, B62)
Calculate the number of primary layers. Start with 1 layer, and check for warnings. The spreadsheet calculates the primary side
wire cross sectional areas based on number of layers, number of turns and bobbin winding width. In the EP-12 prototype 1 layer
corresponds to a wire size of AWG 26, but due to skin effect is not fully utilized. Using 0.8 layers, does not fill up the bobbin
entirely, but has an acceptable winding resistance and current density.
Enter number of layers
L = 0.8
(L, B63)
2.712
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