AS19-G データシートの表示（PDF） - Unspecified
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AS19-G Datasheet PDF : 12 Pages
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18+1 Channel Voltage Buffers for TFT LCD
EC5579
Output Phase Reversal
The EC5579 is designed to prevent its output from being phase reversal as long as the input voltage is limited from
VS-－0.5V to VS+ ＋0.5V. Figure 2 shows a photo of the device output with its input voltage driven beyond the supply
rails. Although the phase of the device's output will not be reversed, the input's over-voltage should be avoided. An
improper input voltage exceeds supply range by more than 0.6V may result in an over stress damage.
Figure11. Operation with Beyond-the Rails Input
Power Dissipation
The EC5579 is designed for maximum output current capability. Even though momentary output shorted to ground
causes little damage to the device.
For the high drive amplifier EC5579, it is possible to exceed the 'absolute-maximum junction temperature' under
certain load current conditions. Therefore, it is important to calculate the maximum junction temperature for the
application to determine if load conditions need to be modified for the amplifier to remain in the safe operating area.
The maximum power dissipation allowed in a package is determined according to:
PDmax
=
TJmax - TAmax
ΘJA
Where:
TJmax = Maximum Junction Temperature
TAmax= Maximum Ambient Temperature
ΘJA = Thermal Resistance of the Package
PDmax = Maximum Power Dissipation in the Package.
The maximum power dissipation actually produced by an IC is the total quiescent supply current times the total
power supply voltage, plus the power in the IC due to the loads, or:
PDmax =∑i[VS * ISmax + (VS+ – VO) * IL]
When sourcing, and
PDmax = ∑i[VS * ISmax + (VO – VS-) * IL]
When sinking.
E-CMOS Corp. (www.ecmos.com.tw)
Page 8 of 12
2007/06/29
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