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ISL28156 データシート(PDF) 10 Page - Intersil Corporation

部品番号 ISL28156
部品情報  39關A Micropower Single and Dual Precision Rail-to-Rail Input-Output (RRIO) Low Input Bias Current Op Amps
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メーカー  INTERSIL [Intersil Corporation]
ホームページ  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL28156 データシート(HTML) 10 Page - Intersil Corporation

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10
FN6154.4
February 11, 2008
pin. The EN pin also has an internal pull-down. If left open, the
EN pin will pull to the negative rail and the device will be
enabled by default.
The loading effects of the feedback resistors of the disabled
amplifier must be considered when multiple amplifier outputs
are connected together.
Using Only One Channel
The ISL28256 is a dual op amp. If the application only
requires one channel, the user must configure the unused
channel to prevent it from oscillating. The unused channel
will oscillate if the input and output pins are floating. This will
result in higher than expected supply currents and possible
noise injection into the channel being used. The proper way
to prevent this oscillation is to short the output to the
negative input and ground the positive input (as shown in
Figure 36).
Current Limiting
These devices have no internal current-limiting circuitry. If
the output is shorted, it is possible to exceed the Absolute
Maximum Rating for output current or power dissipation,
potentially resulting in the destruction of the device.
Power Dissipation
It is possible to exceed the +125°C maximum junction
temperatures under certain load and power-supply
conditions. It is therefore important to calculate the
maximum junction temperature (TJMAX) for all applications
to determine if power supply voltages, load conditions, or
package type need to be modified to remain in the safe
operating area. These parameters are related using
Equation 1:
where:
•PDMAXTOTAL is the sum of the maximum power
dissipation of each amplifier in the package (PDMAX)
PDMAX for each amplifier can be calculated using Equation 2:
where:
•TMAX = Maximum ambient temperature
θJA = Thermal resistance of the package
•PDMAX = Maximum power dissipation of 1 amplifier
•VS = Supply voltage
•IMAX = Maximum supply current of 1 amplifier
•VOUTMAX = Maximum output voltage swing of the
application
•RL = Load resistance
FIGURE 36. PREVENTING OSCILLATIONS IN UNUSED
CHANNELS
-
+
T
JMAX
T
MAX
θ
JAxPDMAXTOTAL
()
+
=
(EQ. 1)
PD
MAX
2*V
S
I
SMAX
V
S
(
- V
OUTMAX )
V
OUTMAX
R
L
----------------------------
×
+
×
=
(EQ. 2)
ISL28156, ISL28256


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