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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)： | 8/40頁 |
| 文件大?。?/td> | 311K |
| 代理商： | AN-30 |
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AN-30
8
B
12/02
The ripple current in the inductor depends on the converter’s
operating point. In general, K
I
will change with the duty ratio
according to the relationship
(4)
where K
is the limit as the duty ratio approaches zero. The
expression that relates K
I0
to the inductance L for a given
generic output is
(5)
where V
is the voltage on the catch diode when it is
conducting.
K
I
will be between 0.15 and 0.3 for most practical designs. The
K
corresponding to the highest input voltage is used for
calculations. All dependent quantities should then be computed
for the designer’s inspection. Since the duty ratio at the highest
input voltage will usually be very small, K
I0
is usually a very
good approximation to the worst case K
I
.
If any outputs have nonzero minimum load, use the minimum
load as a guide for the upper limit on K
I
. The best regulation
across multiple outputs at minimum load is obtained when
(6)
where I
and I
are the respective minimum and
maximum average output currents.
The common K
at full load allows calculation of the inductance.
The designer has the option to change any value of any inductor
to suit particular requirements. The change in inductance will
change the K
I
for that particular inductor.
For coupled inductors, K
indicates the ripple component of the
total ampere turns, not ripple current on any individual winding.
Step 3. Calculate turns ratios for the transformer.
Turns ratios on the transformer are computed with respect to the
main output winding. The primary-to-main turns ratio is fixed
by the input and output voltages and the maximum duty ratio,
which is limited by the maximum drain-to-source voltage that
is set by the designer. The maximum duty ratio to guarantee
reset of the transformer is
(7)
PI-2821-121401
t
I
I
O
K
I
=
I
DT
S
I
O
(1-D) T
S
T
S
= 1
f
S
I
Figure 6. Inductor Current Showing Definition of K
I
.
K
K
D
I
I
=
(
)
0
1
K
V
V
LI
I
OUTPUT
D OUTPUT C
OUTPUT S
0
=
+
K
I
I
I
MINIMUM
MAXIMUM
≤
2
D
V
V
MAX
RESET
DROPOUT
DSOP
_
.
≤
≤
0 74
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