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參數(shù)資料
| 型號： | AN-16 |
| 英文描述： | TOPSwitch Flyback Design Methodology |
| 中文描述： | TOPSwitch的反激式設(shè)計方法 |
| 文件頁數(shù)： | 7/32頁 |
| 文件大?。?/td> | 247K |
| 代理商： | AN-16 |
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A
6/96
AN-16
7
Step 7.
Determine primary waveform parameters I
AVG
, I
P
, I
R
, I
RMS
:
Calculate average input current, I
AVG
: in Amps
Calculate primary Peak current, I
P
Calculate primary ripple current, I
R
: in Amps
Calculate primary RMS current, I
RMS
: in Amps
(D38)
(D39)
(D40)
(D41)
Step 8 to Step 10.
Choose the smallest possible TOPSwitch
for the job under practical thermal limitation
Start with the smallest
TOPSwitch
based on minimum current limit spec such that 0.9 x I
LIMIT
(minimum)
≥
I
P
Refer to AN-14 Table 2 for thermal considerations. Select larger
TOPSwitch
if necessary.
Step 11.
Check minimum I
of the selected TOPSwitch against required peak current I
P
. Increase K
RP
until K
RP
= 1.0 or
I
P
= 0.9 x I
LIMIT
(minimum)
Enter new value of K
RP
Monitor I
Iterate until K
RP
= 1.0 or I
P
= 0.9 x I
LIMIT
(minimum)
(B20)
(D39)
Step 12.
Calculate primary inductance L
P
(D44)
Step 13.
Choose core and bobbin based on P
O
using AN-18 Appendix A, Table 2 and determine A
e,
L
e,
A
L
and BW from core
and bobbin catalog:
Core effective cross sectional area, A
e
: in cm
2
Core effective path length, L
: in cm
Core ungapped effective inductance, A
L
: in nH/turn
2
Bobbin width, BW : in mm
(B24)
(B25)
(B26)
(B27)
Step 14.
Set value for number of primary layers L and number of secondary turns N
S
(may need iteration):
Starting with L = 2 (Keep 1.0
≤
L
≤
2.0 throughout iteration)
Starting with N
S
= 1 turn/volt for 100/115 VAC
0.6 turn/volt for 230 VAC and universal inputs
Both L and N
S
may need iteration
(B29)
(B30)
Step 15.
Calculate number of primary turns N
P
and number of bias turns N
B
:
Diode voltages: use 0.7V for P/N diode and 0.4V for schottky diode
Set output rectifier forward voltage, V
D
Set bias rectifier forward voltage, V
DB
Calculate number of primary turns N
P
Calculate number of bias turns N
B
(B18)
(B19)
(D45)
(D46)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AN-17 | Flyback Transformer Design for TOPSwitch Power Supplies |
| AN-18 | TOPSwitch Flyback Transformer Construction Guide |
| AN-19 | TOPSwitch Flyback Power Supply Efficiency |
| AN-20 | Transient Suppression Techniques for TOPSwitch Power Supplies |
| AN-22 | OBSOLETE when inventory is depleted. 10% tolerance no l |
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