参数资料
型号: EL5000AERZ
厂商: Intersil
文件页数: 11/12页
文件大小: 0K
描述: IC DRIVER TFT-LCD HV 16TSSOP
标准包装: 94
显示器类型: LCD
电流 - 电源: 1.1mA
电源电压: 3.3V
工作温度: -20°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 16-TSSOP
包装: 管件
EL5000A
Power Dissipation
The dissipated power in R 3 and R 6 could be calculated as
follows:
+40V
23V
We assume that:
+17 V
? V ON = 40V
? V OFF = -20V
? H sync timing frequency = 60kHz
? C L = 5nF
The value of V L (the left over voltage) in the capacitors in
that 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 shown in Equation 1:
+3.3 V
0V
23V
-20V
FIGURE 25.
1/2 × V C = 1/2 × 23 × 5 × 10 = 132 μ J
2 2 -9
(EQ. 1)
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.
The process will be repeated 2 times for the CKV and the
CKVB. In 120,000 cycles per second, the power dissipation
in R 3 and R 6 becomes Equation 2:
FIGURE 26.
For different values of V ON , V OFF , C L and H sync timing
frequency, the worst case dissipation can be calculated in a
similar matter. The value of the R 3 and R 6 must be selected
such that the capacitor C L is discharged via R 3 or R 6 resistor
in one half period of the H sync timing.
× 60 × 10 = 160mW
2 × 1.32 × 10
-6
3
(EQ. 2)
Figures 13 and 14 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.
11
FN6167.2
February 20, 2008
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