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TS2940 Datasheet(PDF) 4 Page - Taiwan Semiconductor Company, Ltd

Part No. TS2940
Description  1A Ultra Low Dropout Fixed Positive Voltage Regulator
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Maker  TSC [Taiwan Semiconductor Company, Ltd]
Homepage  http://www.taiwansemi.com
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 4 page
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TS2940
4-6
2003/12 rev. B
Application Information (continued)
The next parameter which must be calculated is the
maximum allowable temperature rise, TR(max). this is
calculated by the using to formula:
TR(max) = TJ(max) – TA(max)
Where: TJ(max) is the maximum allowable junction
temperature, which is 125
oC for commercial
grade parts.
TA(max) is the maximum ambient temperature
which will be encountered in the application.
Using the calculated values for TR(max) and PD, the
maximum allowable value for the junction to ambient
thermal resistance, θja, can now be found:
θja = TR(max) / PD
IMPORTANT: if the maximum allowable value for is
found to be ≥60
oC/W for the TO-220 package, ≥80 oC/W
for the TO-263 package, ≥150
oC/W for the TO-252
package, or ≥170
oC/W for the SOT-223 package, no
heatsink is needed since the package alone will dissipate
enough heat to satisfy these requirements. If the
calculated value for θja falls below these limits, a
heatsink is required.




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