EL2450C 데이터 시트보기 (PDF) - Elantec -> Intersil

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EL2450C

125MHz Single Supply Dual/Quad Op Amps

Elantec -> Intersil 

EL2250C, EL2450C

125MHz Single Supply Dual/Quad Op Amps

Figure 1.

conditions, or package type need to be modified for the

EL2250C/EL2450C to remain in the safe operating area.

The maximum power dissipation allowed in a package is

determined according to [1]:

PDMAX

=

T----J---M-----A----X-----–----T----A----M-----A----X--

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

load, or [2]

Figure 2.

Short Circuit Current Limit

The EL2250C/EL2450C have internal short circuit pro-

tection 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 dis-

sipation could easily increase such that the part will be

destroyed. Maximum reliability is maintained if the out-

put current never exceeds ±90mA. A heat sink may be

required to keep the junction temperature below abso-

lute maximum when an output is shorted indefinitely.

Power Dissipation

With the high output drive capability of the

EL2250C/EL2450C, it is possible to exceed the 150°C

Absolute Maximum junction temperature under certain

load current conditions. Therefore, it is important to cal-

culate the maximum junction temperature for the

application to determine if power-supply voltages, load

P DM A X

=

N

×

V



s

×

ISMAX

+

(VS

–

VOUT)

×

V-----RO----LU----T--

where:

N = Number of amplifiers

VS = Total Supply Voltage

ISMAX = Maximum Supply Current per amplifier

VOUT = Maximum Output Voltage of the Application

RL = Load Resistance tied to Ground

If we set the two PDMAX equations, [1] & [2], equal to

each other, and solve for VS, we can get a family of

curves for various loads and output voltages according

to [3]:

VS = --R--------L--------×----------(------T-------J----N-(M----I------SA×--------X-×-θ-------J-–R----A-----TL-------)A--------+-M--------V-A--------OX--------U-)----+T-----(---V----O----U----T----)

12

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