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BQ57120EZB38 Datasheet(PDF) 9 Page - SynQor Worldwide Headquarters
SYNQOR [SynQor Worldwide Headquarters]
BQ57120EZB38 Datasheet(HTML) 9 Page - SynQor Worldwide Headquarters
/ 13 page
Product # BQ57120EZB38
Doc.# 005-0006442 Rev. D
BASIC OPERATION AND FEATURES
With voltages dropping and currents rising, the economics
of an Intermediate Bus Architecture (IBA) are becoming
more attractive, especially in systems requiring multiple
low voltages. IBA systems separate the role of isolation and
voltage scaling from regulation and sensing. The BusQor
series bus converter provides isolation and an unregulated
voltage step down in one compact module, leaving regulation
to simpler, less expensive non-isolated converters.
In Figure A below, the BusQor module provides the isolation
stage of the IBA system. The isolated bus then distributes
power to the non-isolated buck regulators to generate the
required voltage levels at the points of load. In this case, the
bucks are represented with SynQor’s NiQor series of non-
isolated DC/DC converters. In many applications requiring
multiple low voltage outputs, significant savings can be
achieved in board space and overall system costs
When designing an IBA system with bus converters, the
designer can select from a variety of bus voltages. While
there is no universally ideal bus voltage, most designs
employ one of the following: 12V, 9.6V, 7.5V, 5V, or 3.3V.
Higher bus voltages can lead to lower efficiency for the buck
regulators but are more efficient for the bus converter and
provide lower board level distribution current. Lower bus
voltages offer the opposite trade offs.
SynQor’s BusQor modules act as a true dc transformer. The
output voltage is proportional to the input voltage, with a
specified “turns ratio” or voltage ratio, plus minor drop from
the internal resistive losses in the module. When used in
IBA systems, the output variation of the BusQor must be in
accordance with the input voltage range of the non-isolated
converters being employed.
The BusQor architecture is very scalable, meaning multiple
bus converters can be connected directly in parallel to allow
current sharing for higher power applications.
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2,
permits the user to control when the converter is on or off.
This input is referenced to the return terminal of the input
In the negative logic version, the ON/OFF signal is active
low (meaning that a low turns the converter on). Figure B
is a detailed look of the internal ON/OFF circuitry.
Typical User Board
Figure A: Example of Intermediate Bus Architecture using BusQor bus converter
and NiQor non-isolated converters
Figure B: Internal ON/OFF pin circuitry
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