Data Sheet
June 27, 2012
EBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
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.
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 Vo,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.
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.
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
Input Under/Over voltage Lockout
The module contains a standard on/off control circuit
reference to the VIN(-) 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 VIN(-)
terminal (Von/off). The switch can be an open collector or
equivalent (see Figure 15). A logic low is Von/off = -0.3V to
0.8V. The typical Ion/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 Von/off generated by the power module is
8.2V. The maximum allowable leakage current of the
switch at Von/off = 2.0V is 10µA. If using an external voltage
source, the maximum voltage Von/off on the pin is 14.5V
with respect to the VIN(-) terminal.
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 VOUT(+) and VOUT(-) 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.
VIN must remain between 40Vdc and 75Vdc for droop
sharing to be functional.
.
.
It is permissible to use a common Remote On/Off signal
to start all modules in parallel.
If not using the remote on/off feature, perform one of the
following to turn the unit on:
. 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, Tdelay, as specified in the
Feature Specifications Table.
For negative logic, short ON/OFF pin to VIN(-).
For positive logic: leave ON/OFF pin open.
When parallel modules startup into a pre-biased output,
e.g. partially discharged output capacitance, the Trise is
automatically increased, as specified in the
Feature Specifications Table, to insure graceful startup.
. Insure that the load is <50% IO,MAX (for a single module)
until all parallel modules have started (load full start >
module Tdelay time max + Trise 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.
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
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