GE Industrial Solutions EBVW025A0B Barracuda Series - Manual (Page 8)

GE
Data Sheet
EBVW025A0B Barracuda™ Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output
April 15, 2013 ©2012 General Electric Company. All rights reserved. Page 8
Feature Descriptions
Overcurrent Protection
To provide protection in a fault output overload condition, the
module is equipped with internal current-limiting circuitry and
can endure current limiting continuously. If the overcurrent
condition causes the output voltage to fall greater than 4.0V
from V
o,set
, the module will shut down and remain latched off.
The overcurrent latch is reset by either cycling the input power
or by toggling the on/off pin for one second. If the output
overload condition still exists when the module restarts, it will
shut down again. This operation will continue indefinitely until
the overcurrent condition is corrected.
A factory configured auto-restart option (with overcurrent and
overvoltage auto-restart managed as a group) is also
available. An auto-restart feature continually attempts to
restore the operation until fault condition is cleared.
Remote On/Off
The module contains a standard on/off control circuit
reference to the V
IN
(-) terminal. Two factory configured remote
on/off logic options are available. Positive logic remote on/off
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
turns the module off during a logic high, and on during a logic
low. Negative logic, device code suffix "1," is the factory-
preferred configuration. The On/Off circuit is powered from an
internal bias supply, derived from the input voltage terminals.
To turn the power module on and off, the user must supply a
switch to control the voltage between the On/Off terminal and
the V
IN
(-) terminal (V
on/off
). The switch can be an open collector
or equivalent (see Figure 15). A logic low is V
on/off
= -0.3V to 0.8V.
The typical I
on/off
during a logic low (Vin=48V, On/Off
Terminal=0.3V) is 147µA. The switch should maintain a logic-
low voltage while sinking 310µA. During a logic high, the
maximum V
on/off
generated by the power module is 8.2V. The
maximum allowable leakage current of the switch at V
on/off
=
2.0V is 10µA. If using an external voltage source, the maximum
voltage V
on/off
on the pin is 14.5V with respect to the V
IN
(-)
terminal.
If not using the remote on/off feature, perform one of the
following to turn the unit on:
For negative logic, short ON/OFF pin to V
IN
(-).
For positive logic: leave ON/OFF pin open.
Figure 15. Remote On/Off Implementation.
Output Overvoltage Protection
The module contains circuitry to detect and respond to output
overvoltage conditions. If the overvoltage condition causes the
output voltage to rise above the limit in the Specifications
Table, the module will shut down and remain latched off. The
overvoltage latch is reset by either cycling the input power, or
by toggling the on/off pin for one second. If the output
overvoltage condition still exists when the module restarts, it
will shut down again. This operation will continue indefinitely
until the overvoltage condition is corrected.
A factory configured auto-restart option (with overcurrent and
overvoltage auto-restart managed as a group) is also
available. An auto-restart feature continually attempts to
restore the operation until fault condition is cleared.
Overtemperature Protection
These modules feature an overtemperature protection circuit
to safeguard against thermal damage. The circuit shuts down
the module when the maximum device reference temperature
is exceeded. The module will automatically restart once the
reference temperature cools by ~25°C.
Input Under/Over voltage Lockout
At input voltages above or below the input under/over voltage
lockout limits, module operation is disabled. The module will
begin to operate when the input voltage level changes to
within the under and overvoltage lockout limits.
Load Sharing
For higher power requirements, the EBVW025A0 power
module offers an optional feature for parallel operation (-P
Option code). This feature provides a precise forced output
voltage load regulation droop characteristic. The output set
point and droop slope are factory calibrated to insure optimum
matching of multiple modules’ load regulation characteristics.
To implement load sharing, the following requirements should
be followed:
 The V
OUT
(+) and V
OUT
(-) pins of all parallel modules must be
connected together. Balance the trace resistance for each
module’s path to the output power planes, to insure best
load sharing and operating temperature balance.
 V
IN
must remain between 40V
dc
and 75V
dc
for droop sharing
to be functional.
 It is permissible to use a common Remote On/Off signal to
start all modules in parallel.
 These modules contain means to block reverse current flow
upon start-up, when output voltage is present from other
parallel modules, thus eliminating the requirement for
external output ORing devices. Modules with the –P option
will self determine the presence of voltage on the output
from other operating modules, and automatically increase
its Turn On delay, T
delay
, as specified in the Feature
Specifications Table.
When parallel modules startup into a pre-biased output, e.g.
partially discharged output capacitance, the T
rise
is
automatically increased, as specified in the
Feature Specifications Table, to insure graceful startup.
 Insure that the load is <50% I
O,MAX
(for a single module) until
all parallel modules have started (load full start > module
T
delay
time max + T
rise
time).
 If fault tolerance is desired in parallel applications, output
ORing devices should be used to prevent a single module
failure from collapsing the load bus.