MS1003SH datasheet(38/41 Pages) SHINDENGEN

38 / 41 page

MS1003SH･MS1004SH

Application Note Ver.2.2

SHINDENGEN ELECTRIC MFG. CO. , LTD

38/41

Formula 6:

470

647









＝1.73[μs]

Formula 5:

(max)

)

(

102











off

=10.55[μs]

On duty ratio:

(max)









off

=0.467

Minimum oscillation frequency:

(max)

(min)









off

=50.48[kHz]

Formula 9:

467

102

(min)











=29.56[W]

The preceding calculation shows that the droop point power is 1.173 times the maximum power; i.e.,

(max)

173





The following formula gives ΔB:

464

102

(max)

(min)













=299.35[mT]

The result indicates whether ΔB presents any problems.

 Corrected parameters

f(min)

50.48 [kHz]

0.467

ΔB

299.4mT

0.647 [mH]

1.73 [μs]

Po×1.173[W]

68 [Turn]

NS1

8 [Turn]

10 [Turn]

Check to determine whether these corrected values are adequate. In particular, make sure PL is not

too large (the output current is not too large) or too small (there is sufficient margin relative to load)

and that the resulting conditions do not lead to saturation of ΔB.

(8) Estimating the voltage applied to the main switching device

After finalizing the transformer design, estimate the

withstand voltage of the main switching device and

check to determine whether the selected main

switching device has sufficient withstand voltage.

The diagram to the right shows a model waveform of

the main switching device when the main switching

device is off. The maximum voltage of the main

switching device is estimated by calculating (1) to

(4).

(1)

(4)

(3)

(2)

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