EL5000AER INTERSIL [Intersil Corporation], EL5000AER Datasheet - Page 10

• Manufacturer Part Number: EL5000AER
• Description: High Voltage TFT-LCD Logic Driver
• Manufacturer: INTERSIL [Intersil Corporation]

Power Dissipation
The dissipated power in R
follows:
We assume that:
• V
• V
• H sync timing frequency = 60kHz
• C
The value of V
case is 23V for the positive discharge and 3.3V for the
negative discharge.
The voltage change across the capacitor is therefore 23V,
see Figure 25.
The stored energy in the capacitor is:
The energy which is stored in the capacitor will be
dissipated on the resistor see Figure 26. The switch will
close 2 x 60,000 in every second.
Since the process will be repeated 2 times, for the CKV and
the CKVB. In 0,000 cycles per second the power dissipation
in R
1/2
2
×
1.32
ON
OFF
×
L
3
V
= 5nF
and R
2
= 40V
×
C
= -20V
10
=
-6
6
1/2
becomes:
×
L
60
, the left over voltage in the capacitors in that
×
23
3
=
2
160mW
×
5
×
3
10
and R
-9
10
=
132µW
6
could calculated as
EL5000A
For different values of V
frequency, the worst case dissipation can be calculated in a
similar matter. The value of the R
such that the capacitor C
in one half period of the H sync timing.
Figures 11 and 12 show the total power dissipation over a
range of possible voltages, operating frequencies and loads.
Care should be taken to prevent the power from exceeding
the maximum rating of the package, as shown in Figure 13.
+40V
-20V
ON
0 V
L
FIGURE 25.
FIGURE 26.
is discharged via R
23V
23V
, V
OFF
3
, C
+17 V
+3.3 V
and R
L
and H sync timing
6
must be selected
3
or R
6
July 28, 2005
resistor
FN6167.0