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MS1003SH Datasheet(PDF) 36 Page - Shindengen Electric Mfg.Co.Ltd

Part # MS1003SH
Description  Control IC
PDF  41 Pages
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Manufacturer  SHINDENGEN [Shindengen Electric Mfg.Co.Ltd]
Direct Link  http://www.shindengen.co.jp/
Logo SHINDENGEN - Shindengen Electric Mfg.Co.Ltd

MS1003SH Datasheet(HTML) 36 Page - Shindengen Electric Mfg.Co.Ltd

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MS1003SH･MS1004SH
Application Note Ver.2.2
SHINDENGEN ELECTRIC MFG. CO. , LTD
36/41
* Setting the on duty ratio (D)
The on duty ratio D is determined primarily by the withstand voltage of the main switching device and
the corresponding heat buildup. The following table lists changes in characteristics resulting from
changes in D.
On duty ratio (D)
Decrease
⇔
Increase
Voltage applied to the main SW device
Fall
⇔
Rise
Main SW device peak current
Increase
⇔
Decrease
Main SW device switching loss
Increase
⇔
Decrease
Main SW device conduction loss
Increase
⇔
Decrease
Operating frequency fluctuation range
Decrease
⇔
Increase
(3) Calculating the primary inductance and the main switch peak current
Substitute
Formula 4:
3
1
(max)
10
50
47
.
0
on
t
=9.4[μs] and
Formula 9:
47
.
0
102
85
.
0
2
.
1
2
.
25
2
DP
I
=1.484[A] into Formula 10.
Formula 10:
484
.
1
10
4
.
9
102
6
Lp
=0.646[mH]
(4) Calculating the number of turns in the primary coil
Substitute
Formula 4:
3
(min)
1
(max)
10
50
47
.
0
f
D
t
on
=9.4[μs]
into Formula 11.
Formula 11:
464
.
0
300
10
10
4
.
9
102
10
7
6
7
1
(max)
(min)
Ae
B
t
V
Np
on
DC
=68.88[Turn]
Round the result to the nearest integer, i.e., Np = 68 turns.
(Round up the result when adjusting D upwards. In the example, the result is rounded down to adjust it
downwards.)
(5) Calculating the number of turns in the control output coil
Formula 6:
12
3
10
470
10
646
.
0
14
.
3
tq
=1.73[μs]
Formula 13:
6
6
6
3
1
10
6
.
9
102
)
10
73
.
1
10
4
.
9
10
50
1
(
68
)
6
.
0
12
(
S
N
=7.76[Turn]
Round the result to the nearest integer, i.e., NS1 = 8 turns.
(Round down the result when adjusting D upwards. In the example, the result is rounded up to adjust it
downwards.)



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