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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： | 5/10页 |
| 文件大小： | 801K |
| 代理商： | FBA48T25280-PCAB |
ZD-02015 Rev 1.0
www.power-one.com
Page 4 of 10
FBA48T25280 DC-DC Converter
36-75 VDC Input; 28VDC @ 25A Output
Preliminary Data Sheet
Operations
Input and Output Impedance
These power converters have been designed to be
stable with a minimum external output capacitor of
220F when used in low inductance input and output
circuits.
If the ambient temperature is lower than
-20 °C, then use 4 x 220uF to reduce ESR. Nichicon
UPW1H221MPD or equivalent is recommended.
In many applications, the inductance associated with
the distribution from the power source to the input of
the converter can affect the stability of the converter.
It is recommended that 2 x 220F with a voltage
rating of 100 VDC be used on the input of the
FBA48T25280.
In applications where the user has to use decoupling
capacitance at the load, the power converter will
exhibit stable operation with the external load
capacitance up to 10,000 F.
ON/OFF Control (Pins 1 and 2)
The ON/OFF pins are used to turn the power
converter on or off remotely via a system signal. The
on/off control is a current driven control. It is isolated
from both the primary and the secondary by
1500VDC. The ON/OFF control turns the converter
on when 1 to 5 mA of current flows from the
ON/OFF+ pin to the ON/OFF- pin. The converter is
off when no current or a small reverse current flows
between the pins. Maximum reverse voltage shall
not exceed 6VDC.
The ON/OFF control current can be generated from
the primary or from the secondary as shown in the
application schematics in Figure 1 and Figure 2.
Vin +
Vin -
On/Off -
On/Off +
Figure 1. ON/OFF Control Using Vin
Figure 2. ON/OFF Control Using Auxiliary Voltage
Remote Sense (Pins 16 and 17)
The remote sense feature of the converter
compensates for voltage drops occurring between
the output pins of the converter and the load. The
SENSE(-) (Pin 16) and SENSE(+) (Pin 17) pins
should be connected at the load or at the point
where regulation is required.
Figure 3. Remote sense circuit configuration.
CAUTION
If remote sensing is not utilized, the SENSE(-) pin must be
connected to the Vout(-) pin, and the SENSE(+) pin must be
connected to the Vout(+) pin to ensure the converter will
regulate at the specified output voltage. If these connections
are not made, the converter will deliver an output voltage that
is higher than the specified data sheet value.
Because the sense leads carry minimal current,
large traces on the end-user board are not required.
However, sense traces should be run side by side
and located close to a ground plane to minimize
system noise and ensure optimum performance.
The converter’s output overvoltage protection (OVP)
senses the voltage across VOUT+ and VOUT-, and
not across the sense lines, so the resistance (and
resulting voltage drop) between the output pins of
the converter and the load should be minimized to
prevent unwanted triggering of the OVP.
When utilizing the remote sense feature, care must
be taken not to exceed the maximum allowable
output power capability of the converter, which is
equal to the product of the nominal output voltage
Rw
Rload
Vin
Vin (+)
Vin (-)
VOUT+
VOUT-
TRIM
SENSE (+)
SENSE (-)
FBA48T25280
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