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K Series with PFC Data Sheet
150 – 280 Watt AC-DC Converters
V ACFAIL Signal (VME)
Available only for models with V o = 5.1 V.
This option defines an undervoltage monitoring circuit for
the input and main output voltage. It generates the ACFAIL
signal (V signal) according to the VME standard.
The low state level of the ACFAIL signal is specified at a
sink current of I V ≤ 48 mA to V V ≤ 0.6 V (open-collector
output of an NPN transistor). The pull-up resistor feeding
the open-collector output should be placed on the VME
backplane.
V V
Input   voltage   monitoring
V2
V V high
3
3
t low min 2
4
t low min 2
3
t low min 2
4
11045a
V V low
0
t
V V
V3
V V high
3
3
t low min
2
3
t low min
2
V V low
0
t
V o
5.1 V
4.875 V
2.0 V
0
V b [VDC]
358
355
0
t h 1
t h 1
t
t
Input voltage failure
Switch-on cycle
Input voltage sag
Switch-on cycle and subsequent
input voltage failure
Output voltage monitoring
V2 V V
V V high
V V low
0
4
4
t
V3 V V
V V high
4
3
3
t low min
2
1
VME request: minimum 4 ms
V V low
0
t
2
3
4
t low min = 40 – 200 ms, typ 80 ms
V V level not defined at V o < 2.0 V
The V signal drops simultaneously with the output
voltage, if the pull-up resistor R P is connected to Vo+;
V o
5.1 V
4.875 V
2.0 V
0
V i
V ti + V hi
V ti
0
Output voltage failure
Fig. 41
V cb , V o , V V , I V , V o /V o nom versus time.
t
t
the V signal remains high if R P is connected to an
external source.
BCD20001-G Rev AC, 16-Dec-2010
Page 26 of 29
www.power-one.com
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