參數(shù)資料
型號(hào)： TXS75ZY-P2R2V
廠商： POWER-ONE INC
元件分類： 電源模塊
英文描述： 1-OUTPUT 90 W DC-DC REG PWR SUPPLY MODULE
封裝： 2.400 X 3.450 INCH, 0.500 INCH HEIGHT, 3/4 BRICK PACKAGE-14
文件頁(yè)數(shù)： 9/27頁(yè)
文件大?。?/td> 2635K
代理商： TXS75ZY-P2R2V
Product Specification
TXS Series: 75…120 A DC-DC Converters
36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W
REV. FEB 18, 2003
17 of 27
www.power-one.com
Over Temperature Protection
These
units
feature
a
non
latching
over
temperature protection circuit to prevent thermal
damage in case of failures of the cooling system.
A second function of the over temperature
protection, is to prevent long term operation at
elevated temperatures due to poor thermal system
design. Long time thermal overload reduces the
reliability of the converters.
A PTC measures the surface temperature of the
PCB near the main transformers. The temperature
protection switches the converter off completely at
approximately 120 °C. After cooling down by 5 to
10 Kelvin, the converter is restarted.
Thermal time constant
TXS modules have a large thermal time constant
of approximately 7 K/Min. A large time constant
increases the converter ruggedness. It allows short
term operation at overload without triggering the
temperature protection. In case of changing loads,
the converter operates at a lower average
temperature which improves the expected lifetime.
Finally a large time constant gives additional
operating time after a break down of the cooling
system.
Hot Spots
TXS modules have large component and material
safety margins. The temperature protection is not
set close to destructive limits. Laboratory tests with
disabled protection at an on board temperature of
170 °C (24 h, full load) showed no performance or
material degradation after cooling down.
Survival under such extreme operating conditions
is only possible, when a converter has a uniform
temperature distribution without any hot spots. Hot
spots are peak temperatures considerably above
the neighbouring components. Hot spots can be
seen quite often in converters without base plate
and are the result of a poor thermal design.
Converters with hot spots need a large derating or
they will suffer a large reduction to the expected
life time.
Opto Couplers
On TXS modules, thermally sensitive components
such as the opto-couplers are placed on a much
cooler, separate hybrid circuit. opto-couplers see a
highly accelerated aging at operating temperatures
above 100 °C. Additionally they are safety critical
components, because they are bridging the safety
barrier between primary and secondary. Safety
agencies don’t allow operation of the opto-couplers
over the rated temperature, which is in almost
every case 100 °C.
Competition single board converters might be
specified for 120 °C or even 130 °C PCB operating
temperatures, but can‘t be operated at this point
because of the on board opto-couplers. Safety
agencies will insist on a temperature reduction of
up to 30 K.
Figure 41: TXS100-ZY at 300 LFM, Ui = 48 V,
Io = 100 A, TA = 27.9 °C, TBP = 59.7 °C,
TPCBmax = 74.1 °C, dT = 14.4 K
The thermal picture of a TXS-
module, underlayed with layout
data shows clearly that hot spots
are successfully avoided. The
temperature distribution in the
middle
section
with
the
synchronous rectifiers is flat. The
temperature rise above the base
plate is only 14.4 K.
The red area is the only warm
section on a TXS. All other power
components are located on the
bottom of the board where they are in direct
thermal contact with the base plate. A thermally
conductive potting material keeps the temperature
rise above the base plate to below 2 K.
Detailed information on the mechanical concept of
the converter, the thermal system design rules and
measurement results are available on the TXS
product CD ROM (available reports see page 6).
← PTC
← OPTO-COUPLER
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