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參數(shù)資料
| 型號： | QME48T40050-PGBLG |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, QUARTER BRICK PACKAGE-8 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大小： | 247K |
| 代理商： | QME48T40050-PGBLG |
ZD-00371 Rev 2, 22-May-09
Page 5 of 13
www.power-one.com
QME48T40050 DC-DC Converter Data Sheet
36-75 VDC Input; 5.0 VDC @ 40 A Output
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% relative to the rated output voltage by the
addition of an externally connected resistor.
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
1.225Δ
626
Δ)V
5.11(100
R
NOM
O
INCR
T
[k
],
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
Δ
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 the previous section for a complete discussion
of this requirement.
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
R T-INCR
(Top View)
Converter
QME Series
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
|
Δ
|
511
R DECR
T
[k
]
where,
DECR
T
R
Required value of trim-down resistor [k
]
and Δ is defined above.
Note:
The above equations for calculation of trim resistor values
match those typically used in conventional industry-standard
quarter-bricks.
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
RT-DECR
(Top View)
Converter
QME Series
Fig. D: Configuration for decreasing output voltage.
Trimming/sensing beyond 110% of the rated output
voltage is not an acceptable design practice, as this
condition could cause unwanted triggering of the
output overvoltage protection (OVP) circuit. The
designer should ensure that the difference between
the voltages across the converter’s output pins and
its sense pins does not exceed 10% of VOUT(NOM),
or:
X
NOM
-
O
SENSE
OUT
10%
V
)]
(
V
)
(
[V
)]
(
V
)
(
[V
[V]
This equation is applicable for any condition of
output sensing and/or output trim.
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