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<3> Pull-down resistor power dissipation:
Grid
Segment
Total power dissipation = <1> + <2> + <3> = 118.8 + 26.5 + 11.1 + 52.3 + 390.2 = 598.9 mW
In this manner, design the system so that the power dissipation does not exceed the allowable total power
dissipation rating.
Figure 15-24 shows a display example and display data for "dot type".
330
CHAPTER 15 VFD CONTROLLER/DRIVER
2
(V
– V
)
OD
LOAD
×
Pull-down resistor value
No. of grids + 1
2
(5.5 V – 2 V – (–35 V))
×
25 kΩ
16 grids + 1
2
(V
– V
)
No. of illuminated dots
OD
LOAD
×
Pull-down resistor value
2
(5.5 V – 0.4 V – (–35 V))
×
25 kΩ
User's Manual U11302EJ4V0UM
No. of grids
× Digit width (1 – Cut width) =
16 grids
1
× (1 –
)
16
× Digit width (1 – Cut width) =
No. of grids + 1
110 dots
1
× (1 –
)
16 grids + 1
16
= 52.3 mW
= 390.2 mW
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