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參數(shù)資料
| 型號： | MR2940 |
| 廠商： | Shindengen Electric Manufacturing Company, Ltd. |
| 英文描述： | Provision for Standby mode operation Partial Resonance Power Supply IC Module |
| 中文描述： | 撥備待機模式操作局部共振電源IC模塊 |
| 文件頁數(shù)： | 14/19頁 |
| 文件大?。?/td> | 226K |
| 代理商： | MR2940 |
Shindengen Electric MFG.CO.,LTD
- 14 -
5.2.2 Standard Design Calculations
1
Minimum DC input voltage
AC(min)
V
×
DC(min)
V
1.2
=
[V]
2
Maximum DC input voltage
AC(max)
V
×
DC(max)
V
2
=
[V]
3
Oscillation cycle
(min)
f
(max)
T
1
=
[s]
4
Maximum ON period
(min)
f
on(max)
t
D
=
[s]
5
Maximum OFF period
q
F1
O1
P
ON(max)
)
V
+
DC(min)
(V
×
S1
N
off(max)
t
t
t
V
×
N
+
×
=
[s]
6
Resonance period
2
C
L
2
π
t
q
P
q
×
=
[s]
7
Maximum load power
O(max)
I
O
O(max)
P
V
×
=
[W]
8
Maximum output power
(reference value)
O(max)
P
L
1.3
P
×
=
[W]
9
Peak collector current
D
V
×
η
P
2
I
DC(min)
L
CP
×
×
=
[A]
10
Primary coil inductance
CP
I
on(max)
t
DC(min)
V
P
L
×
=
[H]
11
Number of turns in primary coil
e
9
on(max)
t
×
DC(min)
V
P
A
Δ
B
10
×
N
×
=
[Turn]
12
Core gap
P
2
P
e
10
g
L
N
A
10
×
4
π
l
×
×
=
[mm]
The gap I
g
is the center gap value.
Review transformer core size and oscillation frequency and redesign if I
g
is 1mm or greater.
13
Number of turns
in control output coil
on(max)
t
DC(min)
V
q
on(max)
t
(min)
f
×
P
F1
O1
S1
)
t
1
(
N
)
V
(V
N
×
×
+
=
[Turn]
14
Number of turns
in non-control output coil
F1
O1
F2
O2
S1
S2
V
V
V
V
N
N
+
+
×
=
[Turn]
15
Number of turns in control coil
F1
O1
FNC
V
+
NC
V
S1
C
V
V
N
N
+
×
=
[Turn]
Consider the secondary diode forward voltage for each output when determining the number of turns in an output coil.
V
FNC
is the control coil voltage rectification diode forward voltage.
The reference value for determining the control coil voltage V
NC(min)
is 15V to 17V.
If the V
NC(min)
value is too small, start-up characteristics may deteriorate and start-up may become difficult.
If the V
NC(min)
value is too large, the over-voltage latch stop voltage V
OP
is able to be reached easily.
Check the V
NC(min)
voltage in an actual circuit during the design process to determine its optimum value.
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