GE Industrial Solutions EBDW020A0B Barracuda Series - Manual (Page 10)

GE
Data Sheet
EBDW020A0B Barracuda™ Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 20.0A, 240W Output
April 15, 2013 ©2012 General Electric Company. All rights reserved. Page 10
Feature Descriptions (continued)
Load Sharing
For higher power requirements, the EBDW020A0 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.
Remote Sense
Remote sense minimizes the effects of distribution losses by
regulating the voltage at the remote-sense connections (See
Figure 17). The SENSE(-) pin should be always connected to
V
O
(–).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(+) ]  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).
Figure 17. Circuit Configuration for remote sense.
Configurable Control Pins
The EBDW020A0B contains two configurable control pins, T/C1
and C2, referenced to the module secondary SIG_GND. See
Mechanical Views for pin locations. The following table list the
default factory configurations for the functions assigned to
these pins. Additional configurations can be accomplished via
the PMBus command, MFR_CPIN_ARA_CONFIG. Following the
table, there is a feature description for each function.
Pin Designation/Function Module
Configuration
T/C1 C2 Code
On/Off (o) Power Good w/o -P Factory Default
Trim On/Off (o) w/o -P Via PMBus
Trim Power Good w/o -P Via PMBus
On/Off (o) Power Good with -P Factory Default
Remote On/Off(o)
The module contains an additional remote on/off control input
On/Off(o), via either the T/C1 or C2 pin, reference to the
SIG_GND pin. The factory default configuration is set to ignore
this input, unless activated by the PMBus command,
MFR_CPIN_ON_OFF_CONFIG. This command is also used to
configure the logic for the On/Off(o) pin. Positive logic remote
on/off turns the module on during a logic HI voltage on the
ON/OFF pin, and off during a logic LO. Negative logic remote
on/off turns the module off during a logic HI, and on during a
logic LO. The On/Off(o) circuit is powered from an internal bias
supply, referenced to SIG_GND. To turn the power module on
and off, the user must supply a switch to control the voltage
between the On/Off (o) terminal and the SIG_GND pin (V
on/off
(o)).
The switch can be an open collector or equivalent (see Figure
14). A logic LO is V
on/off
(o) = -0.3V to 0.8V. The typical I
on/off
(o)
during a logic low is 330µA. The switch should maintain a logic
LO voltage while sinking 250µA. During a logic HI, the
maximum V
on/off
(o) generated by the power module is 3.3V. The
maximum allowable leakage current of the switch at V
on/off
(o) =
2.0V is 130µA. If using an external voltage source, the
maximum voltage V
on/off
on the pin is 3.3V with respect to the
V
i
(-) terminal.
If not using the Remote On/Off(o) feature, the pin may be left
N/C.