EL5120IWTZ-T7 데이터 시트보기 (PDF) - Intersil

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EL5120IWTZ-T7

12MHz Rail-to-Rail Input-Output Op Amps

Intersil 

EL5120, EL5220, EL5420

output waveforms for the device in the unity-gain

configuration. Operation is from ±5V supply with a 10kΩ load

connected to GND. The input is a 10VP-P sinusoid. The

output voltage is approximately 9.985VP-P.

VS=±5V

TA=25°C

AV=1

VIN=10VP-P

FIGURE 25. OPERATION WITH RAIL-TO-RAIL INPUT AND

OUTPUT

Short Circuit Current Limit

The EL5120, EL5220, and EL5420 will limit the short circuit

current to ±120mA 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 continuous current never exceeds

±30mA. This limit is set by the design of the internal metal

interconnects.

Output Phase Reversal

The EL5120, EL5220, and EL5420 are immune to phase

reversal as long as the input voltage is limited from (VS-)

-0.5V to (VS+) +0.5V. Figure 26 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.

1V

100µs

VS=±2.5V

TA=25°C

AV=1

1V

VIN=6VP-P

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:

PDMAX = T----J---M-----A----X--Θ---–-J---A-T----A---M-----A----X--

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 loads, or:

PDMAX = Σi × [VS × ISMAX + (VS+ – VOUTi ) × ILOADi]

when sourcing, and:

PDMAX = Σi × [VS × ISMAX + (VOUTi – VS- ) × ILOADi]

when sinking.

where:

• i = 1 to 2 for dual and 1 to 4 for quad

• VS = Total supply voltage

• ISMAX = Maximum supply current per amplifier

• VOUTi = Maximum output voltage of the application

• ILOADi = Load current

If we set the two PDMAX equations equal to each other, we

can solve for RLOADi to avoid device overheat. Figures 27

and 28 provide a convenient way to see if the device will

overheat. The maximum safe power dissipation can be

found graphically, based on the package type and the

ambient temperature. By using the previous equation, it is a

simple matter to see if PDMAX exceeds the device's power

derating curves. To ensure proper operation, it is important

to observe the recommended derating curves in Figures 27

and 28.

FIGURE 26. OPERATION WITH BEYOND-THE-RAILS INPUT

Power Dissipation

With the high-output drive capability of the EL5120, EL5220,

and EL5420 amplifiers, it is possible to exceed the 125°C

“absolute-maximum junction temperature” under certain load

11

FN7186.4

February 21, 2005

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