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参数资料
| 型号： | FBA48T25280-PCAB |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 700 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, FULL BRICK PACKAGE-17 |
| 文件页数： | 6/10页 |
| 文件大小： | 801K |
| 代理商： | FBA48T25280-PCAB |
ZD-02015 Rev 1.0
www.power-one.com
Page 5 of 10
FBA48T25280 DC-DC Converter
36-75 VDC Input; 28VDC @ 25A Output
Preliminary Data Sheet
and the allowable output current for the given
conditions.
When using remote sense, the output voltage at the
converter can be increased by as much as 10%
above the nominal rating in order to maintain the
required voltage across the load. Therefore, the
designer must, if necessary, 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 15)
The output voltage can be adjusted up 15% or down
40%, relative to the rated output voltage by the
addition of an externally connected resistor. Trim up
to 15% is guaranteed only at Vin ≥ 40V.
The TRIM pin should be left open if trimming is not
being used.
To increase the output voltage, refer to Figure 4. A
trim resistor, RT-INCR, should be connected between
the TRIM pin and SENSE+ pin, with a value of:
2
1.225Δ
22.5
1
Δ)V
(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.
Figure 4. Configuration for increasing output voltage.
To decrease the output voltage (Figure 5), a trim
resistor RT-DECR should be connected between the
TRIM pin and the SENSE- pin, with a value of:
2
|
Δ
|
100
R DECR
T
=
,[k]
where,
=
DECR
T
R
Required value of trim-down resistor [k]
and Δ is defined above.
Figure 5. Configuration for decreasing output voltage.
Trimming/sensing beyond 115% 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 15% of VOUT(NOM), or:
X
NOM
-
O
SENSE
OUT
15%
V
)]
(
V
)
(
[V
)]
(
V
)
(
[V
≤
+
+
[V]
This equation is applicable for any condition of output
sensing and/or output trim.
Parallel Applications
The FBA48T25280 features the active current share
circuit to ensure that the two converters connected in
parallel will share current within ±10% of the total
output current.
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
VOUT+
VOUT-
TRIM
SENSE (+)
SENSE(-)
RT-INCR
FBA48T25280
Rload
Vin
Vin (+)
Vin (-)
ON/OFF
VOUT+
VOUT-
TRIM
SENSE (+)
SENSE(-)
RT-DECR
FBA48T25280
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