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參數(shù)資料
| 型號(hào)： | GS-R1005 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開(kāi)關(guān)穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 5/7頁(yè) |
| 文件大?。?/td> | 87K |
| 代理商： | GS-R1005 |
5/7
Thermal characteristics: how to choose the
heat-sink
Sometimes the GS-R1005 requires an external
heat-sinkdependingonbothoperatingtemperature
conditions andpower.
Before entering into calculationsdetails, some ba-
sic conceptswill be explainedto better understand
the problem.
The thermalresistance between two points is rep-
resentedby their temperaturedifference in front of
a specifieddissipated power, andit is expressed in
Degree Centigrade per Watt (
°
C/W).
For GS-R1005 the thermalresistancecase to am-
bientis 7.5
°
C/W.This meansthatan internalpower
dissipationof 1Wwill bring thecase temperatureat
7.5
°
C abovethe ambienttemperature.
Themaximumcasetemperature,atwhichthemod-
ule provides 10A, is 75
°
C (seefig. 6).
Let’ssuppose to have a GS-R1005 that delivers a
load current of 10A at an ambient temperature of
40
°
C.
The dissipated power in this operating condition is
about 10.2W (at typicalefficiency of 83%), and the
case temperatureof the module will be:
T
Case
=
T
Amb
+
P
d
×
R
th
=
40
+
10.2
×
7.5
=
116.8
°
C
Thisvalueexceedsthe maximumallowed tempera-
ture and an externalheat-sink must be added. To
this purpose four holes (see mechanical drawing)
are provided on the metal surface of the module.
Tocalculatethisheat-sink,let’sfirst determinewhat
the total thermal resistanceshould be.
R
th
=
T
CaseMAX
T
amb
P
d
=
75
40
10.2
=
3.42
°
C / W
This value is the resulting value of the additional
heatsinkthermal resistance.
Figure 3.
Figure4.
GS-R1005
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