MS1003SH datasheet(40/41 Pages) SHINDENGEN

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MS1003SH･MS1004SH

Application Note Ver.2.2

SHINDENGEN ELECTRIC MFG. CO. , LTD

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(8) Checking operating points

When checking the operating points, use the design values corrected in Section 6.2 (7)-3).

Work out the operating points of the example power supply in accordance with Section 5.4.

The following table gives the results of calculations based on an input voltage of DC 120 V:

(1)

Trough skip start power

9.33[W]

(2)

Operating frequency at trough skip start

133.3[kHz]

(3)

Trough skip end power

Trough skip end power 1 from Formula 25 of [Condition 1]

.................................................................................... 16.23[W]

As DC 120 V = VDC < VDC (clamp) = 129.4 V;

Trough skip end power 2 from Formula 30 of [Condition 2]-1)

.................................................................................... 26.77[W]

Trough skip end power 1 < Trough skip end power 2

Trough skip end power 1 is used.

16.23[W]

(4)

Operating frequency at trough skip end

Calculated from Formulas 22 and 23 for trough skip end

power 1.

60.74[kHz]

(5)

Auto burst start power

0.62[W]

(6)

Operating frequency immediately before auto burst start

151.86[kHz]

(7)

Auto burst end power

1.03[W]

(8)

Operating frequency immediately after auto burst end

141.87[kHz]

(9)

Droop point power

Calculated from Formula 30 as DC 120 V = VDC < VDC

(clamp) = 129.4 V.

31.8[W]

(10)

Operating frequency at droop point

54.3[kHz]

The chart below shows a model of the operating frequency characteristics relative to output power

indicating each operating point. Check the operating points (1) to (10).

Output power [W]

(6)

(5)(7)

(1)

(3)

(9)

(8)

(2)

(4)

(10)

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