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K Series with PFC Data Sheet
150 – 280 Watt AC-DC Converters
After the ACFAIL signal has gone low, the VME standard
requires a hold-up time t h of at least 4 ms before the 5.1 V
output drops at full load to 4.875 V. This hold-up time t h is
provided by the capacitance supporting the boost voltage
V b . See Hold-up Time.
Table 25: Undervoltage monitor functions
K Connector H15S4
Models with 5.1 V output are fitted with a connector H15S4
(rather than H15S2). This option should be used for new
designs and provides compatibility to LK1001 models.
B, B1, B2 Cooling Plate
355 VDC 1
V output              Monitoring
(VME compatible) V b V o1
V2 yes no
Minimum adjustment
range of threshold level
V t b V to
–
Where a cooling surface is available, we recommend the
use of a cooling plate instead of the standard heat sink.
The mounting system should ensure sufficient cooling
capacity to guarantee that the maximum case tempera-
ture T C max is not exceeded. The cooling capacity is calcu-
V3
yes
yes
355
VDC 1
0.95 – 0.985 V o1 2
lated by:
1
2
Option V monitors V b generated by the boost regulator. The
trigger level is adjusted in the factory to 355 VDC.
Fixed value between 95% and 98.5% of V o1
(100% – η )
P Loss = –––––––––– ? V o ? I o
η
Efficiency η see Model Selection
Option V operates independently of the built-in input
undervoltage lockout circuit. A logic "low" signal is
generated at pin 20, as soon as one of the monitored
voltages drops below the preselected threshold level V t .
The return for this signal is S– or Vo1–. The V output
recovers, when the monitored voltage(s) exceed(s) V t + V h .
The threshold level V to is adjusted in the factory to a
customer-specified value.
V-output (V2, V3):
Connector pin V is internally connected to the open collec-
tor of an NPN transistor. The emitter is connected to S– or
Vo1–. V V ≤ 0.6 V (logic low) corresponds to a monitored
voltage level ( V i and/or V o ) < V t . The current I V through the
open collector should not exceed 50 mA. The NPN output
is not protected against external overvoltages. V V should
not exceed 60 V.
Table 26: Status of V output
For the dimensions of the cooling plates, see Mechnical
Data . Option B2 is for customer-specific models with
elongated case (for 220 mm DIN-rack depth).
G RoHS
Models with G as last character of the type designation are
RoHS-compliant for all six substances.
V b , V o status
V b or V o < V t
V b and V o1 > V t + V h
V output, V V
low, L, V V ≤ 0.6 V at I V = 50 mA
high, H, I V ≤ 25 μA at V V = 5.1 V
11009a
Vo+
20
I V
R p
NPN open
collector
V
V V
14
S–
Fig. 42
Output configuration of options V2 and V3
BCD20001-G Rev AC, 16-Dec-2010
Page 27 of 29
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