GE Industrial Solutions QBDW025A0B Barracuda Series - Manual (Page 9)

GE
Data Sheet
QBDW025A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 9
Feature Descriptions
Overcurrent Protection
To provide protection in a fault output overload condition,
the QBDW025A0B module is equipped with internal current-
limiting circuitry and can endure current limiting
continuously. If the overcurrent condition causes the output
voltage to fall below 4.0V, the module will shut down. The
module is factory default configured for auto-restart
operation. The auto-restart feature continually attempts to
restore the operation until fault condition is cleared. 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.
The IOUT_OC_WARN threshold level, IOUT_OC_FAULT
threshold level, and IOUT_OC_FAULT_RESPONSE can be
reconfigured via the PMBus interface. If the
FAULT_RESPONSE is reconfigured to remain latched off
following an overcurrent shutdown, the overcurrent latch is
reset by either cycling the input power, or by toggling the
on/off pin for one millisecond.
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. The
QBDW025A0B module is factory default configured for auto-
restart operation. The auto-restart feature continually
attempts to restore the operation until fault condition is
cleared. 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.
The VOUT_OV_FAULT threshold level and VOUT_OV_FAULT
_RESPONSE can be reconfigured via the PMBus interface. If
the FAULT _RESPONSE is reconfigured to remain latched off
following an overvoltage shutdown, the overvoltage latch is
reset by either cycling the input power, or by toggling the
on/off pin for one millisecond.
Overtemperature Protection
The modules feature an overtemperature protection circuit
to safeguard against thermal damage. The circuit shuts
down the module when the default maximum device
reference temperature is exceeded. The module is factory
default configured to automatically restart once the
reference temperature cools by ~25°C.
The OT_WARNING and OT_FAULT threshold levels and
OT_FAULT_RESPONSE can be reconfigured via the PMBus
interface. If the FAULT _RESPONSE is reconfigured to remain
latched off following an overtemperature shutdown, the
overtemperature latch is reset by either cycling the input
power or by toggling the on/off pin for one millisecond.
Input Under Voltage Lockout
When Vin exceeds VIN_ON, the module output is enabled,
when Vin falls below VIN_OFF, the module output is
disabled. VIN_ON and VIN_OFF can be reconfigured via the
PMBus interface. A minimum 2V hysteresis between VIN_ON
and VIN_OFF is required.
Input Over Voltage Lockout
The QBDW025A0B module contains circuitry to detect and
respond to input overvoltage conditions. If the overvoltage
condition causes the input voltage to rise above the limit in
the Specifications Table, the module will shut down. The
module is factory default configured for auto-restart
operation. The auto-restart feature continually monitors the
input voltage and will restart the module when the level falls
7V below the VIN_OV_FAULT level.
The VIN_OV_FAULT threshold level can be reconfigured via
the PMBus interface.
Remote On/Off (i)
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 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. 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 14). A logic LO is V
on/off
= -0.3V to 0.8V. The typical
I
on/off
during a logic LO (Vin=48V, On/Off Terminal=0.3V) is
147µA. The switch should maintain a logic LO voltage while
sinking 310µA. During a logic HI, 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 14. Remote On/Off Implementation.