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TS2938 датащи(PDF) 4 Page - Taiwan Semiconductor Company, Ltd

номер детали TS2938
подробное описание детали  500mA Ultra Low Dropout Fixed Voltage Regulator with Inhibit
PDF  5 Pages
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производитель  TSC [Taiwan Semiconductor Company, Ltd]
домашняя страница  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS2938 датащи(HTML) 4 Page - Taiwan Semiconductor Company, Ltd

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TS2938/A
4-5
2004/09 rev. A
Application Information (continued)
The next parameter which must be calculated the
maximum allowable temperature rise.
TR(max) 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
Inhibit Input
TS2938/A feature an active-low (Inhibit) input that
allows ON/OFF control of the regulator. The Inhibit
input has TTL/CMOS compatible thresholds for simple
interfacing with logic interfacing. Inhibit should be
directly tied to Ground or keep open (not connected).
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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