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TN0024 Datasheet(PDF) 6 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) 6 Page - STMicroelectronics

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HOLD-UP graph: Tup = 10 ms
TN0024
6/11
6
HOLD-UP graph: Tup = 10 ms
Equation 25
Equation 26
Figure 1.
Minimum operating voltage vs. bulk capacitance
6.1
HOLD-UP example
●
= 110 AC voltage at turn-off
●
Po = 24 Output power
●
η= 0.84 Efficiency running
●
No = 0.87 Efficiency at turn-off
●
C =
Bulk capacitor
●
f = 60 Line frequency
●
Tup =
Desired HOLD-UP time
●
Vd = 1.2 Voltage drop of the input diodes
●
Rin = 5.5 Inrush resistor and EMI filter resistance in the AC line
V
dc
min c
()
V
ac
off
2Vd
–
R
in
P
o
•
V
ac
off
2N
•
•
--------------------------------------
–
⎝⎠
⎜⎟
⎛⎞ 2 Po
c
------
1
fN
•
------------
2T
up
•
N
o
-------------------
+
⎝⎠
⎛⎞
•
–
=
V
ac
min c
()
V
dc
min c
()
2
--------------------
=
50
52
54
56
58
60
62
64
66
68
70
72
74
76
40
45
50
55
60
65
70
75
80
85
90
95
100
Vdcmin c
()
Vacmin c
()
c10
6
⋅
Capacitance (
µF)
Red solid trace: Minimum DC voltage
Blue dash trace: Minimum AC voltage
V
ac
off
60
10
6
–
•
10
10
3
–
•



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