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參數(shù)資料
| 型號： | ISL28276 |
| 廠商： | Intersil Corporation |
| 英文描述： | Dual and Quad Micropower Single Supply Rail-to-Rail Input and Output (RRIO) Precision Op Amp(雙/四通道，微功率，單電源，軌對軌輸入/輸出(RRIO)精密運(yùn)放) |
| 中文描述： | 雙核和四微功耗單電源軌到軌輸入和輸出（RRIO）精密運(yùn)算放大器（雙/四通道，微功率，單電源，軌對軌輸入/輸出（RRIO）精密運(yùn)放） |
| 文件頁數(shù)： | 12/13頁 |
| 文件大?。?/td> | 459K |
| 代理商： | ISL28276 |
12
FN6301.2
July 11, 2007
Current Limiting
The ISL28276 and ISL28476 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 +150°C maximum junction
temperatures under certain load and power-supply
conditions. It is therefore important to calculate the
maximum junction temperature (T
JMAX
) 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 as follows:
where:
P
DMAXTOTAL
is the sum of the maximum power
dissipation of each amplifier in the package (PD
MAX
)
PD
MAX
for each amplifier can be calculated as follows:
where:
T
MAX
= Maximum ambient temperature
θ
JA
= Thermal resistance of the package
PD
MAX
= Maximum power dissipation of 1 amplifier
V
S
= Supply voltage (Magnitude of V
+
and V
-
)
I
MAX
= Maximum supply current of 1 amplifier
V
OUTMAX
= Maximum output voltage swing of the
application
R
L
= Load resistance
IN
V
+
FIGURE 39. GUARD RING EXAMPLE FOR UNITY GAIN
AMPLIFIER
HIGH IMPEDANCE INPUT
T
JMAX
T
MAX
θ
JA
xPD
MAXTOTAL
(
)
+
=
(EQ. 1)
PD
MAX
2*V
S
I
SMAX
V
S
(
- V
OUTMAX
)
V
L
----------------------------
×
+
×
=
(EQ. 2)
ISL28276, ISL28476
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