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參數(shù)資料
| 型號： | PQ60240HZA25NNF-G |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 600 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, HALF BRICK PACKAGE-10 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大小： | 2078K |
| 代理商： | PQ60240HZA25NNF-G |
Product # PQ60240HZx25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005987 Rev. 1
12/02/10
Page 12
Technical
Specification
PQ60240HZx25
Applications Section
Full-Featured Application Notes
The full-featured option, specified by an “F” in the last character
in the part number, supports current sharing operation, adding
two additional pins: SHARE(+) and SHARE(-)
Connection of Paralleled Units: Up to 100 units can be placed in
parallel. In this current share architecture, one unit is dynamically
chosen to act as a master, controlling all other units. It cannot be
predicted which unit will become the master at any given time, so
units should be wired symmetrically (see fig G).
Input power pins and output power pins should be tied
together between units, preferably with wide overlapping
copper planes.
The SHARE(+) and SHARE(-) pins should be routed
between all paralleled units as a differential pair.
The ON/OFF pins should be connected in parallel, and
rise/fall times should be kept below 2ms.
The SENSE(+) and SENSE(-) pins should be connected
either locally at each unit or separately to a common
sense point.
If the TRIM pin is used, then each unit should have its own
trim resistor connected locally between TRIM and SENSE(+)
or SENSE(-).
Automatic Configuration: The micro-controller inside each
power converter unit is programmed at the factory with a unique
chip number. In every other respect, each shared unit is identical
and has the same orderable part number.
On initial startup (or after the master is disabled or shuts down),
each unit determines the chip number of every other unit currently
connected to the shared serial bus formed by the SHARE(+) and
SHARE(-) pins. The unit with the highest chip number dynamically
reconfigures itself from slave to master. The rest of the units (that
do not have the highest chip number) become slaves.
The master unit then broadcasts its control state over the shared
serial bus on a cycle-by-cycle basis. The slave units interpret and
implement the control commands sent by the master, mirroring
every action of the master unit.
If the master is disabled or encounters a fault condition, all units
will immediately shut down, and if the master unit is unable to
restart, then the unit with the next highest chip number will
become master. If a slave unit is disabled or encounters a fault
condition, all other units continue to run, and the slave unit can
restart seamlessly.
Automatic Interleaving: The slave units automatically lock
frequency with the master, and interleave the phase of their
switching transitions for improved EMI performance. To obtain the
phase angle relative to the master, each slave divides 360 degrees
by the total number of connected units, and multiples the result by
its rank among chip numbers of connected units.
ORing Diodes placed in series with the converter outputs must
also have a resistor smaller than 500 OHMS placed in parallel. This
resistor keeps the output voltage of a temporarily disabled slave
unit consistent with the active master unit. If the output voltage
of the slave unit were allowed to totally discharge, and the slave
unit tried to restart, it would fail because the slave reproduces the
duty cycle of the master unit, which is running in steady state and
cannot repeat an output voltage soft-start.
Common Mode Filtering must be either a single primary side
choke handling the inputs from all the paralleled units, or multiple
chokes placed on the secondary side. This ensures that a solid
Vin(-) plane is maintained between units.
Resonance between Output Capacitors is Possible: When
multiple units are paralleled, it is possible to excite a series
resonance between the output capacitors on two units and the
air core inductors formed by the output pins. This is especially
likely at higher output voltages where the on-board capacitance
is relatively small. The problem is independent of external
output capacitance. To ensure that this resonant frequency is
below the switching frequency, for output voltages above 18V, it
is recommended to add at least 470nH of inductance in series
with each converter output. This could comprise the leakage
inductance of a secondary side common mode choke.
RS-485 Physical Layer: The internal RS-485 transceiver includes
many advanced protection features for enhanced reliability:
Current Limiting and Thermal Shutdown for
Driver Overload Protection
IEC61000 ESD Protection to +/- 16.5kV
Hot Plug Circuitry – SHARE(+) and SHARE(-)
Outputs Remain Tri-State During Power-up/Power-down
Internal Schottky Diode Termination: Despite signaling
at high speed with fast edges, external termination resistors
are not necessary. Each receiver has four Schottky diodes built
in, two for each line in the differential pair. These diodes clamp
any ringing caused by transmission line reflections, preventing
the voltage from going above about 5.5 V or below about -0.5
V. Any subsequent ringing then inherently takes place between
4.5 and 5.5 V or between -0.5 and 0.5 V. Since each receiver on
the bus contains a set of clamping diodes to clamp any possible
transmission line reflection, the bus does not necessarily need to
be routed as a daisy-chain.
Pins SHARE(+) and SHARE(-) are referenced to Vin(-), and
therefore should be routed as a differential pair near the Vin(-
) plane for optimal signal integrity. The maximum difference in
voltage between Vin(-) pins of all units on the share-bus should
be kept within 0.3V to prevent steady-state conduction of the
termination diodes. Therefore, the Vin(-) connections to each unit
must be common, preferably connected by a single copper plane.
advanced
publication
advanced
publication
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