TK6591x
DESIGN CONSIDERATIONS (CONT.)
requirements, the following charts will suggest the TK6592x family of EL Drivers which have higher drive capabilities. To
utilize the following charts in selecting an appropriate coil, perform the following steps:
1) From the following charts, select the chart that matches the part number of the Toko EL Driver that will be used in
the application. The part number of the Toko EL Driver will be dependant upon the desired frequency of the EL panel
(e.g., TK65911 = 200Hz).
2) Determine input supply voltage range (e.g., 4 to 6 V). The x-axis of the following charts represent the minimum
expected supply voltage. Below this minimum supply voltage the EL Driver output may begin to droop. On the
appropriate chart, draw a vertical line upward from the minimum supply voltage represented on the x-axis (e.g., 4V).
3) Draw a horizontal line passing through the chosen inductor value on the y-axis (e.g., 820 µH).
4) The vertical and horizontal lines drawn in steps 2 and 3 respectively will intersect at a point. This point will lie in one
of four regions of the chart (e.g., D31FU). These four regions suggest which family of Toko Coils to use.
Of the three coil families suggested in these charts, the D31FU has the smallest physical size but also has higher DC
resistance. The D52FU series of coils has the largest physical size and the lowest DC resistance. The D52FU or the
D32FU can be used as a reasonable substitute for the D31FU. Similarly, the D52FU can be used as a replacement for
the D32FU. Substituting a coil with lower DC resistance will generally result in a system that will consume less power
supply current.
TK65910, TK65911
TK65912, TK65913
TK65914, TK65915
USE TK6592X
3900
3300
2700
2200
1800
1500
1200
1000
820
USE TK6592X
USE TK6592X
3900
3300
2700
2200
1800
1500
1200
1000
820
3900
3300
D52FU
D52FU
D52FU
2700
2200
1800
1500
1200
1000
820
D32FU
D32FU
D32FU
X
D31FU
D31FU
D31FU
680
680
680
330
330
330
3
4
5
6
3
4
5
6
3
4
5
6
MINIMUM SUPPLY (V)
MINIMUM SUPPLY (V)
MINIMUM SUPPLY (V)
TK65916, TK65917
TK65918, TK65919
USE TK6592X
USE TK6592X
3900
3300
2700
2200
1800
1500
3900
3300
2700
2200
1800
1500
1200
1000
820
D52FU
D52FU
D32FU
D32FU
1200
1000
820
D31FU
D31FU
680
680
330
330
3
4
5
6
3
4
5
6
MINIMUM SUPPLY (V)
MINIMUM SUPPLY (V)
May 2000 TOKO, Inc.
Page 13
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