EL5611 Intersil Corporation, EL5611 Datasheet - Page 11

• Manufacturer Part Number: EL5611
• Description: 6-Channel Vcom Amplifierthe EL5611 And EL5811 Are Low Power, High Voltage Rail-to-rail Inputoutput Amplifiers Targeted Primarily at Vcom Applications in Tft-lcd Displays. The EL5611 Contains Six Amplifiers, And The EL5811 Contains Eight Amplifiers. O
• Manufacturer: Intersil Corporation

Applications Information
Product Description
The EL5611 and EL5811 voltage feedback amplifiers are
fabricated using a high voltage CMOS process. They exhibit
rail-to-rail input and output capability, are unity gain stable
and have low power consumption (2.5mA per amplifier).
These features make the EL5611, and EL5811 ideal for a
wide range of general-purpose applications. Connected in
voltage follower mode and driving a load of 1kΩ, the EL5611
and EL5811 have a -3dB bandwidth of 60MHz while
maintaining a 75V/µs slew rate. The EL5611 a six channel
amplifier, and the EL5811 an 8 channel amplifier.
Operating Voltage, Input, and Output
The EL5611and EL5811 are specified with a single nominal
supply voltage from 5V to 15V or a split supply with its total
range from 5V to 15V. Correct operation is guaranteed for a
supply range of 4.5V to 16.5V. Most EL5611 and EL5811
specifications are stable over both the full supply range and
operating temperatures of -40°C to +85°C. Parameter
variations with operating voltage and/or temperature are
shown in the typical performance curves.
The input common-mode voltage range of the EL5611 and
EL5811 extends 500mV beyond the supply rails. The output
swings of the EL5611 and EL5811 typically extend to within
100mV of positive and negative supply rails with load
currents of 5mA. Decreasing load currents will extend the
output voltage range even closer to the supply rails. Figure
27 shows the input and output waveforms for the device in
the unity-gain configuration. Operation is from ±5V supply
with a 1kΩ load connected to GND. The input is a 10V
sinusoid. The output voltage is approximately 9.8V
Short Circuit Current Limit
The EL5611 and EL5811 will limit the short circuit current to
±180mA if the output is directly shorted to the positive or the
negative supply. If an output is shorted indefinitely, the power
dissipation could easily increase such that the device may
be damaged. Maximum reliability is maintained if the output
FIGURE 27. OPERATION WITH RAIL-TO-RAIL INPUT AND
V
S
OUTPUT
= ±5V, T
5V
5V
A
= 25°C, A
11
V
= 1, V
10µs
IN
= 10V
P-P
P-P
.
EL5611, EL5811
P-P
continuous current never exceeds ±65mA. This limit is set by
the design of the internal metal interconnects.
Output Phase Reversal
The EL5611 and EL5811 are immune to phase reversal as
long as the input voltage is limited from V
+0.5V. Figure 28 shows a photo of the output of the device
with the input voltage driven beyond the supply rails.
Although the device's output will not change phase, the
input's overvoltage should be avoided. If an input voltage
exceeds supply voltage by more than 0.6V, electrostatic
protection diodes placed in the input stage of the device
begin to conduct and overvoltage damage could occur.
Power Dissipation
With the high-output drive capability of the EL5611 and
EL5811 amplifiers, it is possible to exceed the 125°C
'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:
P
where:
• T
• T
• Θ
• P
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:
P
DMAX
DMAX
FIGURE 28. OPERATION WITH BEYOND-THE-RAILS INPUT
AMAX
JMAX
DMAX
JA
= Thermal resistance of the package
=
=
= Maximum junction temperature
= Maximum ambient temperature
T
-------------------------------------------- -
Σi V
= Maximum power dissipation in the package
JMAX
V
[
S
= ±2.5V, T
S
1V
1V
Θ
×
–
JA
I
SMAX
T
AMAX
A
= 25°C, A
+
(
V
S
+ V
–
V
10µs
= 1, V
OUT
IN
i )
= 6V
×
S
I
LOAD
- -0.5V to V
P-P
i
]
August 3, 2005
FN7355.1
S
+