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| 型號： | AN-30 |
| 英文描述： | TOPSwitch-GX Forward Design Methodology |
| 中文描述： | 的TOPSwitch - GX系列正向設(shè)計方法 |
| 文件頁數(shù)： | 31/40頁 |
| 文件大?。?/td> | 311K |
| 代理商： | AN-30 |
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AN-30
31
B
12/02
Step (n)-Step (p). Calculation of RMS Ripple currents in output capacitors, parameters for the coupled inductor and stresses
on the rectifier diodes.
Calculations of RMS Ripple currents in output capacitors:
I
,
I
,
I
The RMS currents in the output capacitors, for each individual output is calculated by the spreadsheet. The values for EP-12
supply are as follows:
I
RMS MAIN
=
0.52
A
I
RMS MAINMA
=
0.52
A
I
RMS AUX1
0.17
A
(IRMSMAIN, F108)
(IRMSMAINMA, F109)
(IRMSAUX1, F110)
For the auxiliary output this ripple current calculation is only an estimate. This value varies with the coupling co-efficient,
parasitic voltage drops and other quantities which are difficult to predict.
Choose output capacitors to meet the above ripple current requirements.
Parameters for the coupled output inductor, and mag-amp inductance:
L
MAIN
, L
MAINMA
The turn’s-ratio for the coupled choke is the same as that of the transformer.
N
N
LAUX
=
The inductor is computed by the spreadsheet
L
MAIN
=
10.1
μ
H
(LMAIN, F68)
An inductor value of 10.2
μ
H
was tried in the EP-12 design. Bench evaluation of the prototype for fine adjustment led to
satisfactory performance with this value for the inductor.
The mag-amp inductance is calculated by spreadsheet. This is calculated as 12.4
μ
H
.
LMAINMA = 12.4
μ
H
(LMAINMA, B90)
First select the closest standard value. If performance is not satisfactory, a more accurate inductor should be wound. For the
EP-12 design a standard 15
μ
H
inductor was found to be satisfactory.
PIV stress on Rectifier diodes:
VPIVMAIN, VPIVMAINMA, VPIVAUX1, VPIVB
The spreadsheet calculates the peak inverse voltage that is imposed on the rectifier diodes.
Main output rectifier peak inverse voltage = 29.5 V
MagAmp output rectifier peak inverse voltage = 29.5 V
Auxiliary output rectifier peak inverse voltage = 34.9 V
Bias winding output rectifier peak inverse voltage = 102.1 V
(VPIVMAIN, F114)
(VPIVMAINMA, F115)
(VPIVAUX1, F116)
(VPIVB, F118)
Choose rectifier diodes with PIV ratings typically 120% of the ratings calculated above.
3
4
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