參數(shù)資料
型號(hào): TS2938CP58.0
廠(chǎng)商: Taiwan Semiconductor Co., Ltd.
英文描述: 500mA Ultra Low Dropout Fixed Voltage Regulator with Inhibit
中文描述: 500mA的超低壓差穩(wěn)壓器固定與抑制
文件頁(yè)數(shù): 4/5頁(yè)
文件大?。?/td> 108K
代理商: TS2938CP58.0
TS2938/A
4-5
2004/09 rev. A
Application Information (continued)
The next parameter which must be calculated the
maximum allowable temperature rise.
T
R
(max) is calculated by the using to formula:
T
R
(max) = T
J
(max) – T
A
(max)
Where: T
J
(max) is the maximum allowable junction
temperature, which is 125
o
C for commercial
grade parts.T
A
(max) is the maximum ambient
temperature which will be encountered in the
application.
Using the calculated values for T
R
(max) and P
D
, the
maximum allowable value for the junction to ambient
thermal resistance,
θ
ja
, can now be found:
θ
ja
= T
R
(max) / P
D
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
o
C/W for the TO-220 package,
80
o
C/W for the
TO-263 package,
150
o
C/W for the TO-252 package,
or
170
o
C/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
θ
ja
falls below these limits, a heatsink is
required.
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