LD05-20B09(2008) データシートの表示（PDF） - MORNSUN Science& Technology Ltd.

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LD05-20B09
(Rev.:2008)

3-5W,AC-DC CONVERTER

MORNSUN Science& Technology Ltd. 

In Figure 1, F1 refers to the input fuse. Proper fuse selection should be a safety agency

approved, slow blow fuse. Selection of the proper fuse rating is necessary to ensure power

converter and system protection (potential failure if the rating is too high) and prevent false

fuse blowing (which could happen if the rating is too low). Below is the formula to calculate

the proper rating:

I = 3 x Vo1 x Io1 / η / Vin(min.)

Vo1 = output voltage

Io1 = output current;

η = the converter’s efficiency;

Vin(min) = the minimum input voltage

Futher circuit notations:

♦ NTC is a thermistor.

♦ CY and CX are safety capacitors.

♦ C1 is a high frequency ceramic capacitor or polyester capacitor, 0.1μF/50V.

♦ C2 is output filtering high frequency aluminum electrolytic capacitor. Select a 220μF

rating if the output current is greater than 5A, or a 100μF rating if the output current is less

than 5A. The insulation voltage should be derated to less than 80% of rated value.

For dual or triple output converters, the circuit of input side remains the same and the outputs

should be considered independently in component selection (see Figure 3).

The application circuit shown in Figure 1 is typical application circuit, whereby all MORNSUN

products will meet EMI Class B, and Class 3 lightening strike and surge testing (see component

datasheets for more details). To comply with more stringent EMC testing, additional filtering

should be incorporated. See Figure 2 for a suggested filtering circuit.

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