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參數(shù)資料
| 型號： | QMS14DG |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 70 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | MODULE-8 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 453K |
| 代理商： | QMS14DG |
MCD10143 Rev.1.0, 27-Jan-10
Page 15 of 20
www.power-one.com
QMS DC-DC Series Data Sheet
Wide-Range Input, 70 to 82W Quarter-Brick Converters
QMS07DH Trim Values
Vo Increase
Vo Decrease
ΔVo%
R-UP
(K)
New Vo
(VDC)
ΔVo%
R-DOWN
(K)
New Vo
(VDC)
1
4535
12.12
1
501
11.88
2
2287
12.24
2
245
11.76
3
1538
12.36
3
160
11.64
4
1164
12.48
4
118
11.52
5
939
12.60
5
92
11.40
6
789
12.72
6
75
11.28
7
682
12.84
7
63
11.16
8
602
12.96
8
54
11.04
9
539
13.08
9
47
10.92
10
489
13.20
10
41
10.80
Figure 35. QMS07DH Trim Characteristics
Notes:
1.
When the output voltage is trimmed up, the output power
from the converter must not exceed its maximum rating. The
power is determined by measuring the output voltage on the
output pins, and multiplying it by the output current.
2.
In order to avoid creating apparent load regulation
degradation, it is important that the trim resistors be
connected directly to the remote sense pins, and not to the
load or to traces going to the load.
3.
The output voltage increase can be accomplished either by
the trim or by the remote sense or by the combination of
both. In any case, the absolute maximum output voltage
increase shall not exceed the limits defined in the Features
Specification
section above.
4.
Either Rup or Rdown should be used to adjust the output
voltage according to the equations above. If both Rup and
Rdown are used simultaneously, they will form a resistive
divider and the equations above will not apply.
Thermal Considerations
QMS converters are designed for both natural and forced
convection cooling. To achieve long term reliability, the
recommended power derating curves below, were
established by comparing measured junction and hot spot
temperatures against those allowed per Power-One’s
component derating guidelines
The graphs in Figures 37 thru 42 show the maximum
recommended output current of each QMS converter at
various ambient temperatures under both natural and
forced convection cooling (longitudinal airflow direction,
from pin 1 to pin 3). Vin for both 24 VDC and 48 VDC
conditions are shown.
Thermal Measurements
Measurements requiring airflow were made in Power-
One’s vertical wind tunnel equipment using both Infrared
(IR) thermography as well as the traditional thermocouple
method. The converter was soldered to a test board
consisting of a 0.060” thick printed wiring board (PWB)
with four layers. The top and bottom layers were not
metalized. The two inner layers, comprised of two-ounce
copper, were used to provide traces for connectivity to the
converter. The lack of metalization on the outer layers as
well as the limited thermal connection ensured that heat
transfer from the converter to the PWB was minimized.
This provides a worst-case but consistent scenario for
thermal derating purposes.
With the converter installed into the host application,
customer verification that all components are at or below
their safe operating temperatures may be performed
similarly. However, for a more simplified testing method,
monitoring the converter’s designated thermal reference
point (TC) will yield effective results.
The
recommended
location
of
the
measuring
thermocouple is shown below. This reference point should
be maintained at < 125
OC.
It is recommended to use a 32AWG to 40AWG
thermocouple wire probe on the location identified below;
labeled
TC
Figure 36. Thermal Reference, TC.
(QMS25DE shown)
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