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參數(shù)資料
| 型號： | FHS18Z28NT |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 500 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 742K |
| 代理商： | FHS18Z28NT |
REV. JUN 09, 2004
Page 6 of 11
FHS DC-DC Series Data Sheet
500-Watt, Full-Brick Converter
OVP Operation
Figure 5. Output Voltage Under OVP Condition,
Vin = 75Vdc, Min Load. Scale is 10V/Div.
(Actual amplitude: 34VPEAK)
Typical Application
Figure 6 shows the recommended connections for
the FHS Series converter.
+Vo
+Sense
Trim
-Sense
-Vo
-Vi
+Vi
On/O ff
Fuse
C1
C2
C3
FHSXXZX
Figure 6. Typical Application of the FHS Series
FHS Series converters do not require any external
components for proper operation.
However, if the
distribution of the input voltage to the converter
contains significant inductance, the capacitor C1 may
be required to enhance performance of the converter.
A minimum of a 100
F electrolytic capacitor with the
ESR<0.7
is recommended.
Refer to the “Inrush Current Control Application Note”
on www.power-one.com for suggestions on how to
limit the magnitude of the inrush current.
For output decoupling we recommend to use a 10
F
tantalum and a 1
F ceramic capacitors connected
directly across the output pins of the converter. Note
that the capacitors do not substitute the filtering
required by the load.
Shutdown Feature Description
The ON/OFF pin in the FHS Series converters
functions as a normal soft shutdown.
It is
referenced to the –Vin pin or signal ground (see
Figure 6).
With the positive logic, when the
ON/OFF pin is pulled low, the output is turned off
and the unit exhibits very low input current.
With negative logic (which is denoted by the suffix
“–N” in the part number), when the ON/OFF pin is
pulled low, the unit is turned on.
An open collector switch is recommended to control
the voltage between the ON/OFF pin and the -Vin
pin of the converter. The ON/OFF pin is pulled up
internally, so no external voltage source is required.
The user should avoid connecting a resistor
between the ON/OFF pin and the +Vin pin.
When the ON/OFF pin is used to achieve remote
control, the user must take care to insure that the
pin reference for the control is really the -Vin pin.
The control signal must not be referenced ahead of
EMI filtering, or remotely from the unit.
Optically
coupling the information and locating the optical
coupler directly at the module will solve any of
these problems.
Note:
If the ON/OFF pin is not used, it can be left floating (positive
logic), or connected to the -Vin pin (negative logic).
Remote Sense
The FHS Series converters have the capability to
remotely sense both lines of the output.
This
feature
moves
the
effective
output
voltage
regulation point from the output of the unit to the
point of connection of the remote sense pins. This
feature automatically adjusts the output voltage of
the converter in order to compensate for voltage
drops in distribution and maintain a regulated
voltage at the point of load.
This is shown in
Figures 6, 7 & 8.
If the remote sense feature is not to be used, the
sense pins should be connected locally.
The
+Sense (or Vsense) pin should be connected to the
+Vout pin directly at the output of the converter and
the –Sense (Vsense RTN) pin should be connected
to the -Vout pin directly at the output of the
converter.
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