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参数资料
| 型号： | QM48T40012-NBAU |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 33/38页 |
| 文件大小： | 616K |
| 代理商： | QM48T40012-NBAU |
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REV. JAN 06, 2006
Page 4 of 38
www.power-one.com
QM48T40 DC-DC Converter Data Sheet
36-75 VDC Input; 1.0-3.3 VDC @ 40 A Output
decrease the maximum current (originally obtained from the
derating curves) by the same percentage to ensure the
converter’s actual output power remains at or below the
maximum allowable output power.
Output Voltage Adjust /TRIM (Pin 6)
The output voltage can be adjusted up 10% or down 20% for
Vout ≥ 1.5 V, and ±10% for Vout = 1.2 V and 1.0 V relative
to the rated output voltage by the addition of an externally
connected resistor. For 3.3 V output voltage, trim up to 10%
is guaranteed only at Vin ≥ 40 V, and it is marginal (8% to
10%) at Vin = 36 V.
The TRIM pin should be left open if trimming is not being
used. To minimize noise pickup, a 0.1 F capacitor is
connected internally between the TRIM and SENSE(-) pins.
To increase the output voltage, refer to Fig. C. A trim
resistor, RT-INCR, should be connected between the TRIM
(Pin 6) and SENSE(+) (Pin 7), with a value of:
10.22
1.225
626
)V
5.11(100
R
NOM
O
INCR
T
+
=
[k
](3.3-1.5 V)
7.2
84.6
R INCR
T
=
[k
] (1.2V)
9
120
R INCR
T
=
[k
] (1.0 V)
where,
=
INCR
T
R
Required value of trim-up resistor [k
]
=
NOM
O
V
Nominal value of output voltage [V]
100
X
V
)
V
(V
NOM
-
O
NOM
-
O
REQ
-
O
=
[%]
=
REQ
O
V
Desired (trimmed) output voltage [V].
When trimming up, care must be taken not to exceed the
converter‘s maximum allowable output power. See previous
section for a complete discussion of this requirement.
Rload
Vin
Vin (+)
Vin(-)
ON/ OFF
Vout (+)
Vout (-)
TRIM
SENSE(+)
SENSE(-)
RT-INCR
(Top View)
Converter
Series
QmaXTM
Fig. C: Configuration for increasing output voltage.
To decrease the output voltage (Fig. D), a trim resistor,
RT-DECR, should be connected between the TRIM (Pin 6) and
SENSE(-) (Pin 5), with a value of:
10.22
|
|
511
R DECR
T
=
[k
] (For 3.3 - 1.5 V)
15
|
|
700
R DECR
T
=
[k
] (1.2 V)
17
|
|
700
R DECR
T
=
[k
] (1.0 V)
where,
=
DECR
T
R
Required value of trim-down resistor [k
]
and is as defined above.
Note: The above equations for calculation of trim resistor
values match those typically used in conventional industry-
standard quarter-bricks (except for 1.2 V and 1.0 V outputs).
Converters with output voltages 1.2 V and 1.0 V are
available with alternative trim feature to provide the
customers with the flexibility of second sourcing.
For 1.2 V and 1.0 V only, “T” version converter with a
character “T” in the part number uses the following trim
equations:
485
R INCR
T
=
[k
] (1.2 V)
2
323
R INCR
T
=
[k
] (1.0 V)
10.22
|
|
511
R DECR
T
=
[k
] (For 1.2 V and 1.0 V)
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| QM48T40012-NBAUA | 制造商:Power-One 功能描述: |
| QM48T40012-NBB0 | 制造商:Power-One 功能描述: |
| QM48T40012-NBB0G | 制造商:Power-One 功能描述:DC/DC PS SGL-OUT 1.2V 40A 132W - Bulk |
| QM48T40012-NBBP | 制造商:Power-One 功能描述:DC/DC PS SGL-OUT 1.2V 40A 132W - Bulk |
| QM48T40012-NBBPG | 制造商:Power-One 功能描述:DC/DC PS SGL-OUT 1.2V 40A 132W - Bulk |
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