EQ2660-9R Datasheet, PDF (18/26 Pages) Power-One – Q Series Data Sheet 66 – 132 Watt DC-DC Converters

Q Series Data Sheet
®
66 – 132 Watt DC-DC Converters
Output Good Signal (Out-OK)
The isolated Out-OK output gives a status indication of the
converter and the output voltage. It can be used for control
functions such as data protection, central system monitoring or
as a part of a self-testing system. It can be connected to get a
centralized fault detection or may be used for other system-
specific applications at the primary or the secondary side of
the converter.
Connecting the Out-OK as per fig. 22, V_OK <1.0 V indicates that
the V_o or V_o1 of the converter is within the range V_{t1 low} – V_{t1 high}.
V_{t1 low} corresponds to 0.95 - 0.98 V_{o1 nom}, V_{t1 high} to 1.02 – 1.05
V_{o1 nom}.
Note: Using the R-input or the option P, the monitor level is
tracking the programmed output voltage.
In an error condition, if the output voltage is out of range due to
overload or an external overvoltage, V_OK will approach V_p.
The output is formed by an NPN transistor. The emitter (Out
OK–) can be connected to primary Vi– or secondary Vo1– to
get an open-collector output. In a configuration of several Q
Series converters, the Out OK pins can be series-connected in
order to get a system level signal (as shown in fig. 9). If one of
the converters fails, the series-connected output rises to high
impedance.
Output
control
circuit
06096a
1k
I_OK
22
+ _Vp
R_p
Out OK+
20 V
V_OK
24
Out OK–
Fig. 22
Out OK function
Dimensioning of resistor value R_p ≥ –––^V–^p––
0.5 mA
Caution: Out-OK is protected by an internal series
resistor and a Zener diode. To prevent damage, the
applied current I_OK should be limited to ±10 mA.
Table 10: Out-OK data
Characteristics
Conditions
min typ max Unit
V_OK Out-OK voltage Output okay, I_OK<0.5 mA
I_OK Out-OK current Output fail, V_OK ≤ 15 V
0.8 1.0 V
25 µA
Sense Lines
This feature allows for compensation of voltage drops at the
main output across connector contacts and load lines. If the
sense lines are connected at the load rather than directly at the
connector, the user must ensure that the differential voltages
(measured on the connector) ∆V_S+ (between Vo+ and S+) and
∆V_{S –} (between Vo– and S–) do not exceed the values in the
table below.
Applying generously dimensioned cross-section load leads
help avoiding troublesome voltage drops. To minimize noise
pick-up, wire the sense lines parallel or twisted. For
unsymmetrical loads, we recommend connecting the sense
lines directly at the female connector.
To ensure correct operation, both sense lines must be
connected to their respective power output. With double-
output models, the sense lines must be connected to output 1
only. Caution should be exercised, if outputs are series-
connected, as the compensated voltage is effectively doubled.
Because the effective output voltage and output power are
increased by the sense lines, the minimum input voltage rises
proportionally to the compensated output voltage.
Caution: Sense lines should always be connected. Incorrectly
connected sense lines may cause an overvoltage at the ouput,
which could damage the output load and activate the second
control loop. The sense lines can handle only small currents.
Table 11: Voltage compensation by sense lines
Nominal output
voltage
3.3 V, 5.1 V
12 V, 15 V
24 V
∆V_S+
≤ 0.5
≤ 1.0
≤ 1.0
∆V_{S –}
≤ 0.25
≤ 0.5
≤ 1.0
Sum of
∆V_S+ + ∆V_S–
≤ 0.5
≤ 1.0
≤ 2.0
Unit
V
Note: Sense line connection in a redundant configuration is
shown in fig. 10.
Test Jacks and LEDs
Test jacks (for pin diameter 2 mm) are located at the front of
the converter and allow monitoring the main output voltage at
the sense line terminals. The test sockets are protected by
internal series resistors. Double-output models show the
sense line voltage of output 1 at the test jacks. 48Q models
have no test jacks.
48Q models exhibit a green LED In-OK to monitor the input
voltage. BQ – GQ models have an additional LED Out-OK,
which is activated simultaneously to the Out-OK signal.
Table 12: Display status of LEDs
LED In OK
green
green
green
off
off
LED Out OK
green
x
off
green
off
Operating condition
normal operation
incorrect sense line connection
overtemperature
overload
output overvoltage
output undervoltage
not possible
no input voltage
input voltage too low
input voltage too high
inhibit input open/high
x = dependent on actual operating condition
BCD20011- G Rev AG, 12-Mar-2012
Page 18 of 26
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