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): 6/16頁(yè)
文件大小: 239K
代理商: Z0109MA
Philips Semiconductors
AN10384
Triac power and thermal calculations
3. Calculating T
j
max
T
j
max is influenced by ambient temperature, triac power dissipation and the thermal
resistance between junction and ambient. For this Application Note, only the steady state
condition will be considered. [In the short-term transient condition, transient thermal
impedance (Z
th
) applies. This will always be lower than the steady-state thermal
resistance (R
th
). The transient condition is a lot more complicated and beyond the scope
of this guide.]
(6)
a
thj
a
j
R
P
T
T
×
+
=
T
j
– junction temperature (
°
C).
T
a
– ambient temperature (
°
C).
P
– triac power dissipation (W).
R
th j-a
– junction-to-ambient thermal resistance (
°
C/W).
3.1 Analysis of R
th j-a
Thermal resistance is similar to electrical resistance in that the total resistance can be
broken down into several smaller resistances in series. For the most popular package
(TO220), R
th j-a
is composed of the following resistances:
(7)
a
thhs
R
hs
thmb
R
mb
thj
a
thj
R
R
+
+
=
Figure 3 shows thermal resistance broken down in pictorial form.
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Application note
Rev. 01 — 10 August 2005
6 of 16
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