TK65930 Ver la hoja de datos (PDF) - Toko America Inc
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TK65930 Datasheet PDF : 16 Pages
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TK6593x
DESIGN CONSIDERATIONS
INDUCTOR VALUE SELECTION
Designing an EL Driver utilizing the TK6593x is a very simple task. The primary component affecting the behavior of the
converter is the inductor. Essentially, the entire design task primarily consists of selecting the proper inductor value and
type given the operating conditions of the EL Panel (e.g., lamp capacitance, frequency, output voltage, supply range).
The following tables and charts are intended to simplify the selection of the inductor.
Given the capacitance of the EL Lamp, and the peak output voltage requirements, the following table can be utilized to
select the value of the inductive component.
TABLE 4: PEAK OUTPUT VOLTAGE VS. INDUCTOR VALUE AND LAMP CAPACITANCE
INDUCTOR
VALUE
100 µH
15.0 nF
LAMP
45 V
20.0 nF
LAMP
39 V
25.0 nF
LAMP
35 V
30.0 nF
LAMP
32 V
35.0 nF
LAMP
29 V
40.0 nF
LAMP
27 V
45.0 nF
LAMP
26 V
120 µH
150 µH
49 V
55 V
43 V
48 V
38 V
43 V
35 V
39 V
32 V
36 V
30 V
34 V
28 V
32 V
180 µH
220 µH
60 V
66 V
52 V
58 V
47 V
51 V
43 V
47 V
39 V
44 V
37 V
41 V
35 V
38 V
270 µH
330 µH
74 V
81 V
64 V
70 V
57 V
63 V
52 V
58 V
48 V
53 V
45 V
50 V
43 V
47 V
390 µH
470 µH
88 V
77 V
84 V
69 V
75 V
63 V
69 V
58 V
64 V
54 V
59 V
51 V
56 V
560 µH
680 µH
82 V
75 V
83 V
69 V
76 V
65 V
72 V
61 V
67 V
820 µH
84 V
79 V
74 V
1000 µH
Close to 100 V operation check capacitor C1 voltage rating
87 V
82 V
Note: The voltages indicated in the table above may not be achievable under certain circumstances (i.e., low battery or higher drive frequencies).
Refer to the charts on page 12 to determine which output voltage/coil combination can be supported by the EL driver.
As an example as to how the above table is to be used, assume that we have a 4-square-inch panel (30 nF capacitance)
and we would like the peak-to-peak voltage across the lamp to be 140 V. The peak voltage on either terminal would be
70 V (140 V / 2). Referring to the table above, we can see that using a 470 µH coil the peak voltage developed across
a 30 nF Lamp would be approximately 69 V. In this particular example, the inductive component should have a value of
470 µH.
INDUCTOR TYPE SELECTION
After the value of the inductor has been selected, an appropriate coil type needs to be selected taking into account such
factors as DC resistance and current capability. The following charts can be utilized for selecting the proper family of Toko
Coils. Furthermore, the following charts will also indicate if the TK6593x is the appropriate driver given the frequency and
input supply requirements. The following charts will indicate whether or not the TK6593x has sufficient drive capability,
Page 12
May 2000 TOKO, Inc.
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