參數(shù)資料
型號(hào)： EL2250CSZ-T7
廠商： INTERSIL CORP
元件分類(lèi)： 音頻／視頻放大
英文描述： 125MHz Single Supply Dual/Quad Op Amps
中文描述： 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝： ROHS COMPLIANT, SOP-8
文件頁(yè)數(shù)： 12/15頁(yè)
文件大?。?/td> 419K
代理商： EL2250CSZ-T7
12
FN7061.2
June 7, 2005
Short Circuit Current Limit
The EL2250/EL2450 have internal short circuit protection
circuitry that protect it in the event of its output being shorted
to either supply rail. This limit is set to around 100mA
nominally and reduces with increasing junction temperature.
It is intended to handle temporary shorts. If an output is
shorted indefinitely, the power dissipation could easily
increase such that the part will be destroyed. Maximum
reliability is maintained if the output current never exceeds
±90mA. A heat sink may be required to keep the junction
temperature below absolute maximum when an output is
shorted indefinitely.
Power Dissipation
With the high output drive capability of the EL2250/EL2450,
it is possible to exceed the 150°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 power-supply
voltages, load conditions, or package type need to be
modified for the EL2250/EL2450 to remain in the safe
operating area.
The maximum power dissipation allowed in a package is
determined according to [1]:
where:
T
JMAX
= Maximum Junction Temperature
T
AMAX
= Maximum Ambient Temperature
θ
JA
= Thermal Resistance of the Package
PD
MAX
= 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 load, or
[2]:
where:
N = Number of amplifiers
V
S
= Total Supply Voltage
I
SMAX
= Maximum Supply Current per amplifier
V
OUT
= Maximum Output Voltage of the Application
R
L
= Load Resistance tied to Ground
If we set the two PD
MAX
equations, [1] & [2], equal to each
other, and solve for V
S
, we can get a family of curves for
various loads and output voltages according to [3]:
Figures 3 through 6 below show total single supply voltage
V
S
vs. R
L
for various output voltage swings for the PDIP and
SO packages. The curves assume WORST CASE
conditions of T
A
= +85°C and I
S
= 6.5mA per amplifier.
FIGURE 2.
PD
MAX
T
--------------------------------------------
T
JA
–
=
PD
MAX
N
V
s
I
SMAX
V
S
V
OUT
–
(
)
V
L
---------------
×
+
×
×
=
V
S
R
---------------------------------------------------------------
------------------------------------------------------------------------------------------
T
IS
T
R
L
–
(
)
×
V
OUT
(
)
+
V
OUT
+
=
EL2250, EL2450
相關(guān)PDF資料
PDF描述
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