GE Industrial Solutions EVK011A0B Series (Eighth-Brick) - Manual (Page 7)

GE
Data Sheet
EVK011A0B Series (Eighth-Brick) DC-DC Converter Power Modules
36–60Vdc Input; 12.0Vdc Output; 11A Output Current
May 15, 2013 ©2012 General Electric Company. All rights reserved. Page 7
Feature Description
Remote On/Off
Two remote on/off options are available. Positive logic turns the
module on during a logic high voltage on the ON/OFF pin, and
off during a logic low. Negative logic remote On/Off, device code
suffix “1”, turns the module off during a logic high and on during
a logic low.
ON/OFF
Vin+
Vin-
I
on/off
V
on/off
Vout+
TRIM
Vout-
Figure 10. Remote On/Off Implementation.
To turn the power module on and off, the user must supply a
switch (open collector or equivalent) to control the voltage
(V
on/off
) between the ON/OFF terminal and the V
IN
(-) terminal (see
Figure 10). Logic low is 0V ≤ V
on/off
≤ 1.0V. The maximum I
on/off
during a logic low is 1mA, the switch should be maintain a logic
low level whilst sinking this current.
During a logic high, the typical maximum V
on/off
generated by the
module is 5V, and the maximum allowable leakage current at
V
on/off
= 5V is 1μA.
If not using the remote on/off feature:
For positive logic, leave the ON/OFF pin open.
For negative logic, short the ON/OFF pin to V
IN
(-).
Remote Sense
Remote sense minimizes the effects of distribution losses by
regulating the voltage at the remote-sense connections (See
Figure 11). The voltage between the remote-sense pins and the
output terminals must not exceed the output voltage sense
range given in the Feature Specifications table:
[V
O
(+) – V
O
(–)] – [SENSE(+) – SENSE(–)]  0.5 V
Although the output voltage can be increased by both the
remote sense and by the trim, the maximum increase for the
output voltage is not the sum of both. The maximum increase is
the larger of either the remote sense or the trim. The amount of
power delivered by the module is defined as the voltage at the
output terminals multiplied by the output current. When using
remote sense and trim, the output voltage of the module can be
increased, which at the same output current would increase the
power output of the module. Care should be taken to ensure
that the maximum output power of the module remains at or
below the maximum rated power (Maximum rated power =
Vo,set x Io,max).
V O (+)
SENSE(+)
SENSE(–)
V O (–)
V I (+)
V I (-)
I O LOAD
CONTACT AND
DISTRIBUTION LOSSE
SUPPLY
I I
CONTACT
RESISTANCE
Figure 11. Circuit Configuration for remote sense .
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout
limit, the module operation is disabled. The module will
only begin to operate once the input voltage is raised
above the undervoltage lockout turn-on threshold,
V
UV/ON
.
Once operating, the module will continue to operate
until the input voltage is taken below the undervoltage
turn-off threshold, V
UV/OFF
.
Overtemperature Protection
To provide protection under certain fault conditions, the
unit is equipped with a thermal shutdown circuit. The
unit will shutdown, if the thermal reference point (Figure
13), exceeds T
ref1
= 133 O C or T
ref2
= 140 O C (typical), but
the thermal shutdown is not intended as a guarantee
that the unit will survive temperatures beyond its rating.
The module will automatically restart upon cool-down
to a safe temperature.
Output Overvoltage Protection
The output over voltage protection scheme of the
modules has an independent over voltage loop to
prevent single point of failure. This protection feature
latches in the event of over voltage across the output.
Cycling the on/off pin or input voltage resets the
latching protection feature. If the auto-restart option (4)
is ordered, the module will automatically restart upon
an internally programmed time elapsing.
Overcurrent Protection
To provide protection in a fault (output overload)
condition, the unit is equipped with internal
current-limiting circuitry and can endure current
limiting continuously. At the point of current-limit
inception, the unit enters hiccup mode. If the unit is
not configured with auto–restart, then it will latch off
following the over current condition. The module can be
restarted by cycling the dc input power for at least one
second or by toggling the remote on/off signal for at
least one second. If the unit is configured with the auto-
restart option (4), it will remain in the hiccup mode as
long as the overcurrent condition exists; it operates
normally, once the output current is brought back into
its specified range. The average output current during
hiccup is 10% I
O, max
.