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| 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)： | 16/32頁 |
| 文件大小： | 247K |
| 代理商： | AN-16 |
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AN-16
A
6/96
16
later, a higher V
will result in a larger D
which reduces
TOPSwitch
operating current for the same output power. If
D
comes close to the maximum allowable duty cycle of the
TOPSwitch
(64%) then V
OR
should not be increased any further.
For a 100/115 VAC power supply the V
based on
115 VAC would be 132 VAC which corresponds to:
V
V
MAX
=
×
=
2
132
187
As can be seen in Figure 8, going through the above exercise for
a V
of 187V using a 350V
TOPSwitch
results in a standard
clamp Zener voltage of 90V and V
of 60V and a margin of
17V. Likewise in 230VAC or Universal application, a V
of 265VAC corresponds to a V
of 375V. At this value of
V
, a 700V
TOPSwitch
will allow for a standard Zener value
of 200V with corresponding V
of 135V leaving a margin of
25V (see Figure 9). If these margins seem too small, it is
important to remember that this analysis uses all worst case
values added together and typical margins will be much greater.
Also,
TOPSwitch
breakdown voltage increases at high
temperature, providing additional margin.
Step 5. Determine maximum duty cycle at low line
D
MAX
using V
OR
and V
MIN
Once the V
OR
and V
MIN
are known, it is easy to calculate the
D
MAX
:
D
V
V
V
V
MAX
OR
OR
MIN
DS
=
+
(
)
V
is the average Drain to Source voltage during
TOPSwitch
ON time. As shown in Figures 10 and 11, with V
set to zero,
the value of D
ranges from 36%/40% for single input voltage
applications to 60% for the universal input application. In
reality, V
should be set to approximately 10V which results in
a slight increase in D
MAX
.
Higher V
directly increases the output power capability of a
given
TOPSwitch
, while lower V
allows larger V
and
consequently larger D
, also increasing the output power of
a given
TOPSwitch
. Therefore, a narrower input voltage range
always leads to either a higher output power or a lower power
supply cost.
BVDSS
VMIN
VOR = 60 V
350 V (700 V)
216 V (520 V)
236 V (540 V)
180 V (440 V)
150 V (375 V)
90 V (240 V)
0 V
0 V
DMAX
40%
VCLM
VCLO
VCLM = 1.4 x VCLO =126V
BLOCKING DIODE FORWARD RECOVERY = 20 V
(135 V)
(36%)
PI-1857-050696
(200 V)
Figure 10. Determine D
MAX
- 100/115 VAC (230 VAC) Input
相關(guān)PDF資料 |
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|---|---|
| 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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