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High Temperature Control
At high temperatures, thermal control is performed by decreasing the maximum duty
cycle of the backlight inverter. See Table 22 and Figure 21 below.
Table 22. High Temperature Control Parameters.
Parameter
Active temperature sensor
Control
Hysteresis
Figure 21. Temperature Control: Maximum Pulse Width Modulation Duty Cycle.
SENSOR TEMPERATURE VS MAXIMUM PWM DUTY CYCLE
110
100
90
80
70
60
50
40
30
20
10
0
-10
80
30
LC640.480.21-065 Operations Manual (OM610-00)
Value
Monitor temperature sensor with the highest reading
Maximum duty cycle is stepped as shown in Figure 21
3.0
85
90
95
SENSOR TEMPERATURE (C)
100
105
110
Units
None
%
C
115
120
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