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參數(shù)資料
| 型號(hào)： | AN-23 |
| 英文描述： | TinySwitch Flyback Design Methodology |
| 中文描述： | 據(jù)稱，TinySwitch反激式設(shè)計(jì)方法 |
| 文件頁(yè)數(shù)： | 6/12頁(yè) |
| 文件大?。?/td> | 401K |
| 代理商： | AN-23 |
AN-23
A
7/99
6
Calculate overall power supply efficiency as:
η
= 100% -
total efficiency loss.
Step 5.
Determine maximum and minimum DC input voltages
V
, V
and input storage capacitance C
IN
.
(see AN-16 for
more detail)
Calculate the maximum V
MAX
as:
V
V
MAX
ACMAX
=
×
2
Choose input storage capacitor, C
IN
per Table 5.
Diode Type
Schottky
UltraFast-PN
Fast-PN
V
R
(V)
40-45
100-200
> 200
Table 6. Diode reverse voltage range.
Table 7.
TinySwitch
output power (P
O
) capability
* Single Voltage 100/115 VAC with voltage doubler, or
Single Voltage 230 VAC without doubler
** Based on EE16 core transformer
Device
TNY253
TNY254
TNY255
P
O
for
Single
Voltage*
5.0
8.0
10
Output Power
Capability (W)
P
O
for
Universal
Voltage
2.5
5.0
7.5
Recommended Power Range
for Lowest Cost** (W)
P
O
for
Single
Voltage*
0-2.5
2.0-5.0
6.0-10
P
O
for
Universal
Voltage
0-1.5
1.0-4.0
3.5-6.5
Set bridge rectifier conduction time t
c
= 3 ms.
Derive minimum DC input voltage, V
MIN
V
V
P
f
t
C
MIN
ACMIN
O
L
C
IN
=
×
(
)
×
×
×
×
2
2
1
2
2
η
where C
IN
: input capacitance
f
L
: line frequency
t
c
: diode conduction time
Step 6.
Determine output diode peak inverse voltage PIV. Calculate
reflected output voltage V
OR
based on V
MAX
, V
O
, V
D
and PIV.
Look up output diode reverse voltage V
R
from diode data
sheet or Table 3 in Step 2.
Calculate maximum peak inverse voltage PIV. The maximum
recommended PIV is 80% of the reverse voltage rating V
R
.
PIV
V
R
=
×
0 8
Calculate reflected output voltage V
OR
:
V
V
V
V
PIV
V
OR
MAX
O
D
O
=
×
+
(
)
If V
> 150 V, go back to Step 2 and choose a different diode
for higher V
.
Refer to Table 6 for approximate V
R
range for different types
of diodes.
Input Voltage
100/115
230
Universal
C
IN
(
μ
F/Watt)
2-3
1
2-3
V
MIN
(V)
≥
90
≥
240
≥
90
Table 5. C
IN
Range
.
Step 7.
Choose
TinySwitch
based on input voltage range and output
power P
O
.
Select appropriate
TinySwitch
according to Table 7 based on
output power P
O
and input voltage range (from Step 1).
For Universal input voltage and an output power range of
1W to 1.5 W, TNY254 is usually a better choice than
TNY253 except for applications requiring low video noise.
For Universal input voltage and an output power range of
3.5W to 4 W, TNY255 usually results in smaller transformer
size and higher efficiency than TNY254.
Step 8.
Determine primary peak current I
. Calculate maximum
duty cycle D
for discontinuous mode of operation based
on V
MIN
, P
O
and I
P
.
Primary peak current is 90% of minimum I
from the data
sheet of the selected
TinySwitch
. 0.9 is the over temperature
derating factor for I
LIMIT
:
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