QBDW025A0B Datasheet, PDF(9/32 Page) Lineage Power Corporation – 36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

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QBDW025A0B Datasheet, PDF (9/32 Pages) Lineage Power Corporation – 36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

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Data Sheet

QBDW025A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

Feature Descriptions

Input Over Voltage Lockout

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 ~25Â°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

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 VIN(-) 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 VIN(-) terminal (Von/off).

The switch can be an open collector or equivalent (see

Figure 14). A logic LO is Von/off = -0.3V to 0.8V. The typical

Ion/off during a logic LO (Vin=48V, On/Off Terminal=0.3V) is

147ÂµA. The switch should maintain a logic LO voltage while

sinking 310ÂµA. During a logic HI, 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

10ÂµA. If using an external voltage source, the maximum

voltage Von/off on the pin is 14.5V with respect to the VIN(-)

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 VIN(-).

For positive logic: leave ON/OFF pin open.

Figure 14. Remote On/Off Implementation.

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.

May 9, 2013

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