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TN0024 Datasheet(PDF) 5 Page - STMicroelectronics

Part # TN0024
Description  Power supply HOLD-UP time
PDF  11 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TN0024 Datasheet(HTML) 5 Page - STMicroelectronics

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TN0024
Equation derivation
5/11
Equation 19
Equation 20
●
How to factor out Po/C:
Equation 21
Equation 22
Equation 23
●
Solving for C in Equation 23 :
Equation 24
V
dc
min
V
b
min
2 2PoTup
CN
o
--------------------
–
=
V
dc
min
V
dc
off
V
d
–
R
inPo
NV
dc
off
------------------
–
⎝⎠
⎜⎟
⎛⎞ 2
P
o
CfN
-----------
–
2P
oTup
CN
o
--------------------
–
=
V
dc
min
V
dc
off
V
d
–
R
inPo
NV
dc
off
------------------
–
⎝⎠
⎜⎟
⎛⎞ 2 Po
C
------
⎝
⎛
–
⎠
⎞ 1
fN
------
2T
up
N
o
-------------
+
⎝⎠
⎛⎞
=
V
dc
off
V
ac
off
2
•
=
V
dc
min
V
ac
off
2
•
V
d
–
R
inPo
NV
ac
off
2
•
--------------------------------
–
⎝⎠
⎜⎟
⎛⎞ 2 Po
C
------ 1
fN
------
2T
up
N
o
-------------
+
⎝⎠
⎛⎞
–
=
C
P
o
1
fN
------
2T
up
N
o
-------------
+
⎝⎠
⎛⎞
V
ac
off
2
•
V
d
–
R
inPo
NV
ac
off
2
•
--------------------------------
–
⎝⎠
⎜⎟
⎛⎞ 2
V
dc
min
2
–
----------------------------------------------------------------------------------------------------------------
=



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