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参数资料
| 型号： | TXS75ZB-NP2R3V |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 135 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | 2.400 X 3.450 INCH, 0.500 INCH HEIGHT, 3/4 BRICK PACKAGE-14 |
| 文件页数： | 17/27页 |
| 文件大小： | 2635K |
| 代理商： | TXS75ZB-NP2R3V |
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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
24 of 27
www.power-one.com
selected above 100 °C. It can be convenient
to use a base plate temperature below 100 °C
in order to optimise the expected lifetime.
3
The value of RthBP-A allows to determine the
required airflow or heat sink using Figure 53.
Derating
A “Derating” is the reduction of the available output
power at high ambient temperature. A derating
keeps the maximum temperatures of the unit
below safety critical limits.
To decide how much the converter can be loaded,
some system parameters need to be known:
Maximum ambient temperature and minimum
airflow at the converter
Height / space restrictions for an additional
heat sink
Layout situation (maximum current density,
neighboring heat sources, shadowing effects,
cooling to the board...)
Supply voltage and maximum output current
(average and peak)
Least favorable input voltage
Reliability target
TXS derating curves were defined for converters
without heat sinks operating at constant base plate
temperatures of 100 °C !
Derating Curves
The derating curves allow a first rough estimation if
a design work. More detailed curves and
explanations can be found in the report “thermal
performance of TXS units” on the product CD
ROM. A second report “Next generation TXS
modules” shows preliminary data of optimised TXS
modules.
The derating data in the figures 54 and 55 shows
two bars for each airflow value. The first bar can
be used for 48 V battery types, where the input
voltage stays within 36 V to 60 V. The second bar
should be used for 60 V battery types, where the
continuous input voltage can be as high as 75 V.
At 75 V, TXS converters have increased loss
compared to the 36 V to 60 V input range. Thus
the maximum allowed ambient temperature for the
full input range is reduced.
20
30
40
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60
70
80
100
150
200
300
400
500
100
150
200
300
400
500
100
150
200
300
400
500
100
150
200
300
400
500
airflow [LFM]
Ta
[°C]
36..60V
36..75V
Figure 54:
Maximum ambient temperature for
different TXS models at different
airflows at 100 A output current and
TBP=100 °C.
30
40
50
60
70
80
90
100
150
200
300
400
500
100
150
200
300
400
500
100
150
200
300
400
500
100
150
200
300
400
500
airflow [LFM]
Ta
[°C]
36..60V
36..75V
Figure 55:
Maximum ambient temperature for
different TXS models at different
airflows at 80 A output current and
TBP = 100 °C
How to calculate the derating in situations where a
converter should operate at a lower base plate
temperature or when additional heat sinks can be
used?
1 The thermal resistance for a given airflow and
heat sink can be found in figure 53
2 The basic formula of the thermal resistance
RthBP-A = (TBP -TA) / PLoss allows to determine
the loss at this cooling condition: PLoss = (TBP -
TA) / RthBP-A
3 Normalise the loss figure to the operating
ambient temperature using the correction factor
of table 7. Ploss 25°C = Ploss TBP / K
4 With the loss value at 25°C it is possible to
determine the maximum output current of the
converter using the loss figures on page 8.
TXS100ZY
TXS100ZA
TXS100ZB
TXS100ZD
TXS100ZY
TXS100ZA
TXS100ZB
TXS100ZD
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