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參數(shù)資料
| 型號： | AN-35 |
| 英文描述： | LinkSwitch Design Guide |
| 中文描述： | 使用LinkSwitch設(shè)計指南 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 504K |
| 代理商： | AN-35 |
AN-35
3
B
4/03
The value for I
is equal to the typical value of the
LinkSwitch
data sheet parameter I
LIM
.
As an initial estimate the I
can be approximated as
4
x
I
. Once the first prototype has been built this can be refined
as the final turns ratio is known or alternatively, the peak diode
forward voltage can be measured directly using an oscilloscope.
The transformer turns ratio is given by:
If no better estimates or measurements are available, use
0.15
as an initial value for the transformer secondary winding
resistance R
, 0.7 V for the forward voltage (V
) of a
Schottky diode or 1.1 V for a PN diode and 0.3
for the cable
resistance R
CABLE
.
Figure 2. Typical Output Characteristic for LinkSwitch Based 5.5 V, 0.5 A Charger with Specification Limits.
Transformer T1
Transformer design begins by selecting the reflected output
voltage (V
). For most
LinkSwitch
designs, V
should be
between 40 V and 60 V. A good starting point is 50 V allowing
for optimization later.
V
values over 60 V are recommended only for those
applications allowed to consume over 300 mW at no-load.
To calculate the transformer turns ratio, the voltage required
across the secondary winding V
is first calculated. This is a
function of output cable voltage drop V
RCABLE
, nominal output
voltage V
O
,
the secondary winding voltage drop V
RSEC
, and
output diode forward voltage drop V
. Figure 1 shows the
sources of secondary side voltage drops. Since C
charges
to the peak value of V
plus an error due to leakage inductance,
the value of V
and V
are defined at the peak secondary
current. The output cable drop V
RCABLE
is defined at the nominal
CC output current I
O
.
Curves of V
versus instantaneous current can be found in
the diode manufacturer
’
s data sheet. Peak secondary current is
defined as:
I
I
N
N
SEC PEAK
(
PRI PEAK
(
P
S
)
)
=
×
(1)
(2)
(3)
(4)
(5)
N
N
V
V
P
S
OR
SEC
=
100
0
200
300
400
500
600
700
Output Current (mA)
O
0
1
2
3
4
5
6
7
8
9
10
115 VAC
230 VAC
Limits (LNK501)
Limits (LNK500)
Auto-restart
P
V
I
R
V
=
I
R
V
V
V
V
V
RCABLE
O
CABLE
×
RSEC
SEC PEAK
(
SEC
+
SEC
O
RCABLE
DOUT
RSEC
=
×
=
+
+
)
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