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AN604 Datasheet(PDF) 5 Page - STMicroelectronics

Part # AN604
Description  Calculation of conduction losses in a power rectifier
PDF  12 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN604 Datasheet(HTML) 5 Page - STMicroelectronics

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AN604
Diode forward characteristics
Doc ID 3607 Rev 3
5/12
For any junction temperature VT0(Tj), RD(Tj) and the forward voltage drop VF(IF,Tj) can be
calculated as follow:
Equation 5
Equation 6
Equation 7
Where
αVTO and αRD are thermal coefficients calculated from the 2 reference temperatures:
Tjref1 and Tjref2. A common choice of Tjref1 and Tjref2 is 25 °C and 125 °C. These thermal
coefficients are calculated with the following equations:
Equation 8
Equation 9
Note:
αVT0 < 0 and αRD > 0 whatever the diode technology.
()
jRef1
j
T0
V
jRef1
T0
j
T0
T
T
α
)
(T
V
)
(T
V
−
⋅
+
=
()
jRef1
j
D
R
jRef1
D
j
D
T
T
α
)
(T
R
)
(T
R
−
⋅
+
=
()
()
F
D
R
T0
V
jRef1
j
jRef1
F
F
j
F
F
I
α
α
T
T
)
T
,
(I
V
)
T
,
(I
V
⋅
+
⋅
−
+
=
() ( )
jref1
jref2
jref1
T0
jref2
T0
T0
V
T
T
T
V
T
V
α
−
−
=
() ( )
jref1
jref2
jref1
D
jref2
D
D
R
T
T
T
R
T
R
−
−
=
α



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