參數(shù)資料
型號(hào): Z0109MA
廠商: NXP Semiconductors N.V.
元件分類: 參考電壓二極管
英文描述: 4Q Triac
中文描述: 4Q雙向可控硅
封裝: Z0109MA<SOT54 (TO-92)|<<http://www.nxp.com/packages/SOT54.html<1<week 5, 2005,;
文件頁(yè)數(shù): 11/16頁(yè)
文件大?。?/td> 239K
代理商: Z0109MA
Philips Semiconductors
AN10384
Triac power and thermal calculations
Using equation 7,
=
a
thhs
R
hs
thmb
R
mb
thj
a
thj
R
R
+
+
From the data sheet, R
th j-mb
= 2
°
C/W. We need to find R
th mb-a
.
Rearranging the equation gives
W
C
R
R
R
mb
thj
a
thj
a
thmb
/
49
2
51
°
=
=
=
This is effectively the “heatsink” thermal resistance, since the PCB is our heatsink in this
case.
As an approximate guide, this thermal resistance can be obtained with a copper pad area
of 500 mm
2
(refer to Philips Application Note “Surface mounted triacs and thyristors”,
document order number 9397 750 02622).
Please note that the actual thermal resistance will be reduced by other, non-dissipating
components in close proximity to the triac, while it will be increased by any components
that dissipate power in the presence of the triac. It is essential therefore to measure the
prototype to discover the true thermal performance.
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Application note
Rev. 01 — 10 August 2005
11 of 16
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