QBVW033A0B_1109 datasheet(8/18 Pages) LINEAGEPOWER

8 / 18 page

Data Sheet

September 23, 2011

QBVW033A0B Series Power Modules; DC-DC Converters

36-75Vdc Input; 12Vdc Output; 33A Output Current

LINEAGE POWER

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.

Remote On/Off

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 14). 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.

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.

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 QBVW033A0 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.



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 may automatically increase the Turn On delay,

Tdelay, as specified in the Feature Specifications Table, if

output voltage is present on the output bus at startup.



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 total 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.

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