TLC080 datasheet(24/52 Pages) TI

24 / 52 page

TLC080, TLC081, TLC082, TLC083, TLC084, TLC085, TLC08xA

FAMILY OF WIDEBANDWIDTH HIGHOUTPUT DRIVE SINGLE SUPPLY

OPERATIONAL AMPLIFIERS

SLOS254D − JUNE 1999 − REVISED FEBRUARY 2004

WWW.TI.COM

APPLICATION INFORMATION

general PowerPAD design considerations (continued)

TJ = 150°C

−55 −40

−10

20 35

MAXIMUM POWER DISSIPATION

FREE-AIR TEMPERATURE

125

TA − Free-Air Temperature − °C

DGN Package

Low-K Test PCB

θJA = 52.3°C/W

SOT-23 Package

Low-K Test PCB

θJA = 324°C/W

−25

110

PWP Package

Low-K Test PCB

θJA = 29.7°C/W

SOIC Package

Low-K Test PCB

θJA = 176°C/W

PDIP Package

Low-K Test PCB

θJA = 104°C/W

NOTE A: Results are with no air flow and using JEDEC Standard Low-K test PCB.

Figure 54. Maximum Power Dissipation vs Free-Air Temperature

The next consideration is the package constraints. The two sources of heat within an amplifier are quiescent

power and output power. The designer should never forget about the quiescent heat generated within the

device, especially multi-amplifier devices. Because these devices have linear output stages (Class A-B), most

of the heat dissipation is at low output voltages with high output currents.

The other key factor when dealing with power dissipation is how the devices are mounted on the PCB. The

PowerPAD devices are extremely useful for heat dissipation. But, the device should always be soldered to a

copper plane to fully use the heat dissipation properties of the PowerPAD. The SOIC package, on the other

hand, is highly dependent on how it is mounted on the PCB. As more trace and copper area is placed around

the device,

θJA decreases and the heat dissipation capability increases. The currents and voltages shown in

these graphs are for the total package. For the dual or quad amplifier packages, the sum of the RMS output

currents and voltages should be used to choose the proper package.

TLC080 데이터시트(PDF) 24 Page - Texas Instruments

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