D356A View Datasheet(PDF) - Unspecified
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D356A Datasheet PDF : 12 Pages
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II. Inductor (L) Selection
The external inductor (L) selection for a D356A circuit greatly affects the output capability and current draw of the
driver. A careful designer will balance current draw considerations with output performance in the choice of an ideal
inductor for a particular application. Figures 3, 4, and 5 show typical brightness and current draw of a D356A circuit with
different inductor values, lamp sizes, and supply voltages. Please note that the DC resistance (DCR) of inductors with
the same nominal inductance value may vary with manufacturer and inductor type. Thus, inductors made by a different
manufacturer may yield different outputs, but the trend of the different curves should be similar. Lamp luminance is also
a function of lamp size. In each example, a larger lamp will have less luminance with approximately the same current
draw.
12
48
Luminance
10
Current
40
8
32
6
24
4
16
2
8
0
0
0
1
2
3
4
5
Inductor (mH)
Figure 3: V+=1.5V, 1 in2 EL Lamp
12
48
10
40
8
32
6
24
4
16
2
Luminance
8
Current
0
0
0
1
2
3
4
5
Inductor (mH)
Figure 4: V+=3.0V, 1 in2 EL Lamp
12
48
Luminance
10
Current
40
8
32
6
24
4
16
2
8
0
0
0
2
4
6
8
10
Inductor (mH)
Figure 5: V+=5.0V, 4 in2 EL Lamp
7
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