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ZXRD1050PQ16 Datasheet(PDF) 5 Page - Diodes Incorporated

Part # ZXRD1050PQ16
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Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

ZXRD1050PQ16 Datasheet(HTML) 5 Page - Diodes Incorporated

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The ZXRD1000 series can be configured to use either
N or P channel MOSFETs to suit most applications.
The most popular f ormat , an a ll N channel
synchronous solution gives the optimum efficiency. A
feature of the ZXRD1000 series solution is the unique
method of generating the synchronous drive, called
 . Most solutions use an additional
output from the controller, inverted and delayed from
the main switch drive. The ZXRD1000 series solution
uses a simple overwinding on the main choke (wound
on the same core at no real cost penalty) plus a small
ferrite bead . This means that the synchronous FET is
only enhanced when the main FET is turned off. This
reduces the ‘blanking period’ required for shoot-
through protection, increasing efficiency and allowing
smaller catch diodes to be used, making the controller
simpler and less costly by avoiding complex timing
circuitry. Included on chip are numerous functions that
allow flexibility to suit most applications. The nominal
switching frequency (200kHz) can be adjusted by a
simple timing capacitor, C3. A low battery detect circuit
is also provided. Off the shelf components are available
from major manufacturers such as Sumida to provide
either a single winding inductor for non-synchronous
applications or a coil with an over-winding for
synchronous applications. The combination of these
switching characteristics, innovative circuit design and
excellent user flexibility, make the ZXRD1000 series
DC-DC solutions some of the smallest and most cost
effective and electrically efficient currently available.
Using Zetex’s HDMOS low RDS(on) devices, ZXM64N02X
for the main and synchronous switch, efficiency can
peak at upto 95% and remains high over a wide range
of operating currents. Programmable soft start can also be
adjusted via the capacitor, C7, in the compensation loop.
What is SimpleSync
Conventional Methods
In the conventional approach to the synchronous
DC-DC solution, much care has to be taken with the
timing constraints between the main and synchronous
switching devices. Not only is this dependent upon
individual MOSFET gate thresholds (which vary from
device to device within data sheet limits and over
temperature), but it is also somewhat dependent upon
magnetics, layout and other parasitics. This normally
means that significant ‘dead time’ has to be factored
in to the design between the main and synchronous
devices being turned off and on respectively.
Incorrect application of dead time constraints can
potentially lead to catastrophic short circuit conditions
between VIN and GND. For some battery operated
systems this can not only damage MOSFETs, but also
the battery itself. To realise correct ‘dead time’
implementation takes complex circuitry and hence
implies additional cost.
The ZETEX Method
Zetex has taken a different approach to solving these
problems. By looking at the basic architecture of a
synchronous converter, a novel approach using the
main circuit inductor was developed. By taking the
inverse waveform found at the input to the main
induc t o r of a non- s y nc hronous s o lut i on , a
synchronous drive waveform can be generated that is
always relative to the main drive waveform and
inverted with a small delay. This waveform can be
used to drive the synchronous switch which means no
complex circuitry in the IC need be used to allow for
shoot-through protection.
Implementation was very easy and low cost. It simply
meant peeling off a strand of the main inductor
winding and isolating it to form a coupled secondary
winding. These are available as standard items
referred to in the applications circuits parts list.The use
of a small, surface mount, inexpensive ’square loop’
ferrite bead provides an excellent method of
eliminating shoot-through due to variation in gate
thresholds. The bead essentially acts as a high
i mp e da n c e fo r the few na n o seco nd s that
shoot-through would normally occur. It saturates very
quickly as the MOSFETs attain steady state operation,
reducing the bead impedance to virtually zero.
The net result is an innovative solution that gives
a ddit i ona l bene f i t s w h i l s t l o w e ri ng overall
implementation costs. It is also a technique that can
be simply omitted to make a non-synchronous
controller, saving further cost, at the expense of a few
efficiency points.

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