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K Series with PFC Data Sheet
150 – 280 Watt AC-DC Converters
Auxiliary Functions
Inhibit for Remote On/Off
The outputs may be enabled or disabled by means of a
logic signal (TTL, CMOS, etc.) applied between the inhibit
input i (pin 18) and pin 14 (S – or Vo1–). In systems with
several converters, this feature can be used to control the
activation sequence of the converters. If the inhibit function
is not required, connect the inhibit pin 18 to pin 14.
Note: If pin 18 is not connected, the output is disabled.
06031b
Sense Lines (Single-Output Models)
Important: Sense lines must always be connected!
Incorrectly connected sense lines may activate the
overvoltage protection resulting in a permanent short-circuit
of the output.
This feature allows for compensation of voltage drops
across the connector contacts and if necessary, across the
load lines. We recommend connecting the sense lines
directly at the female connector.
To ensure correct operation, both sense lines (S+, S –)
should be connected to their respective power outputs
Vo+
i 18
I inh
(Vo+ and Vo –), and the voltage difference between any
sense line and its respective power output (as measured
on the connector) should not exceed the following values:
S–/Vo1– 14
V inh
Table 9: Maximum voltage compensation allowed using
sense lines
Fig. 18
Definition of V inh and I inh .
Table 8: Inhibit characteristics
Output
voltage
5.1 V
Total voltage difference
between sense lines and
their respective outputs
< 0.5 V
Voltage difference
between
Vo– and S–
< 0.25 V
Characteristic
Conditions
min
typ
max Unit
12 V, 15 V, 24 V
< 1.0 V
< 0.25 V
V inh Inhibit
voltage
V o = on
V o = off
V i min – V i max
– 50
2.4
0.8
50
V
Note: If the output voltages are increased above V o nom via
R-input control, option P setting, remote sensing or option T,
the output currents must be reduced accordingly, so that
I inh
t r
t f
Inhibit current
Rise time
Fall time
V inh = 0
30
depending on I o
– 400
μA
ms
P o nom is not exceeded.
Programmable Output Voltage (R-Function)
As a standard feature, the converters offer an adjustable
output voltage, identified by letter R in the type
I inh [mA]
2.0
1.6
1.2
V inh = 0.8 V
V inh = 2.4 V
designation. The control input R (pin 16) accepts either a
control voltage V ext or a resistor R ext to adjust the desired
output voltage. When input R is not connected, the output
voltage is set to V o nom .
a) Adjustment by means of an external control voltage V ext
between pin 16 (R) and pin 14:
0.8
0.4
0
V o = on
V o = off
The control voltage range is 0 – 2.75 VDC and allows an
output voltage adjustment in the range of approximately
0 – 110% V o nom .
V ext ≈ –––––– ? 2.5 V
–0.4
–0.8
–50
–30
–10
0 10
30
50
V inh [V]
V o
V o nom
b) Adjustment by means of an external resistor:
Fig. 19
Typical inhibit current I inh versus inhibit voltage V inh
Depending upon the value of the required output voltage
the resistor shall be connected
V o / V o nom
1
06001
either: Between pin 16 and pin 14 ( V o < V o nom ) to
achieve an output voltage adjustment range of approxi-
mately 0 – 100% V o nom .
0.1
0
t r
t f
t
or: Between pin 16 and pin 12 ( V o > V o nom ) to achieve an
output voltage adjustment range of 100 – 110% V o nom .
Inhibit
1
Warning:
– V ext shall never exceed 2.75 V.
0
Fig. 20
Output response as a function of inhibit control
t
– The value of R ' ext shall never be less than the lowest
value as indicated in table R ' ext (for V 0 > V 0 nom ) to
prevent the converter from damage!
BCD20001-G Rev AC, 16-Dec-2010
Page 13 of 29
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