STEVAL-ISQ009V1 Datasheet, PDF (1/5 Pages) STMicroelectronics – Load share controller demonstration board based on the L6615

STEVAL-ISQ009V1
Load share controller demonstration board based on the L6615
Data brief
Features
■ Three paralleled DC-DC converter modules (in
synchronous buck topology, managed by ST’s
L6910)
■ Output currents shared through ST current
sharing controller L6615
■ Innovative use of a MOSFET as both the OR-
ing element (replacing OR-ing diode) and
sensing element (R_DS(on))
■ RoHS compliant
Description
The STEVAL-ISQ009V1 demonstration board is
composed of three identical sections
(daughterboards) and a motherboard.
Each daughterboard is capable of performing DC-
DC conversion starting from +5 VDC and is
designed to deliver 3.3 V / 5 A to the load.
The input terminals of the motherboard are
connected to a +5 VDC external source and the
output terminals to the load. The board can
accommodate up to three DC-DC converters.
The motherboard contains the circuitry necessary
to perform current sharing (utilizing the L6615)
and to isolate a failed section from the load. It is
designed to be adaptable to all power supplies
(compatible with the L6615 absolute maximum
ratings) having remote sense pins. By changing
just a few components, it can be modified for new
specifications.
It is possible to build a system to supply a 10 A
load at +3.3 V in a 2+1 redundant configuration.
That is, whenever three sections are running,
each of them supplies 3.33 A, a value lower than
its nominal capability.
If one of them is switched off, the system is able to
supply the load, and each section carries 5 A.
DC-DC conversion management is performed by
the L6910.
STEVAL-ISQ009V1
It is possible to verify that disabling one section
(through the relevant switch on the motherboard)
does not cause overvoltage on the output or
overcurrent in other sections. In the same way,
enabling one section (with the other two already
running) does not cause negative output voltage
drop or a short to ground, and current sharing is
established.
February 2010
Doc ID 17166 Rev 1
For further information contact your local STMicroelectronics sales office.
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www.st.com
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