Rugged Environment
AC-DC Converters >100 Watt
K Series
Edition 4/4.99
27/28
MELCHER
The Power Partners.
3
5.1 V
4.875 V
0
U
ci [V DC]
0
t
358
355
Input voltage failure
Switch-on cycle
Input voltage sag
Switch-on cycle and subsequent
input voltage failure
U
V high
U
V low
U
V
0
V2
t
U
o1
0
U
V high
U
V low
U
V
0
V2
U
i
U
ti
4
Output voltage failure
0
U
V high
U
V low
U
V
3
U
ti + Uhi
t
low min
2
t
low min
2
t
low min
2
3
4
U
V high
U
V low
U
V
0
V3
t
3
t
low min
2
t
low min
2
3
t
h
1
2.0 V
t
h
1
4
3
4
t
low min
2
V3
5.1 V
4.875 V
0
U
o1
2.0 V
Input voltage monitoring
Output voltage monitoring
11045
t
Fig. 40
Relationship between Uci, Uo1, UV, IV and Uo1/Uo nom ver-
sus time.
1 VME request: minimum 4 ms
2 tlow min = 40...200 ms, typically 80 ms
3 UV level not dened at Uo1 < 2.0 V
4 The V signal drops simultaneously with the output voltage if the
pull-up resistor
RP is connected to Vo1+.
The V signal remains high if
RP is connected to an external
source.