参数资料
| 型号： | QMS25DE-N |
| 厂商： | Power-One |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | FRONT PANEL 8TE |
| 标准包装： | 10 |
| 系列： | * |
QMS DC-DC Series Data Sheet
Wide-Range Input, 70 to 82W Quarter-Brick Converters
Typical Application
Input and Output Impedance
The QMS-Series has been designed for stability without
external capacitance when used in low inductance input
and output circuits. In many applications, the inductance
associated with the distribution of the power source to the
input of the power converter can negatively affect a
converter’s stability. The addition of a 33 μF electrolytic
capacitor with an ESR < 100 m ? , across the input helps to
ensure stability of the converter. This capacitor should be
of suitably high quality and rated for effective use at low
temperatures as needed.
Features Description
ON/OFF Control
(-x) “no suffix” model
With the positive logic model, when the ON/OFF pin is
pulled low, the output is turned off and the unit draws less
than 25 mA of input current. If the ON/OFF pin is not used,
it can be left floating.
(-N) suffix model
With negative logic , when the ON/OFF pin is pulled low,
the unit is turned on. If the ON/OFF pin is not used, it can
be connected to the -Vin pin.
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.
Additionally, see the EMC section further below in this
datasheet for discussion for other external component
which may be required for reduction of conducted
emissions.
The QMS can support high amounts of output capacitance.
Refer to “ Output Specification” tables for details.
Inrush Current
Refer to the “Inrush Current Control Application Note”:
( http://www.power-one.com/technical/articles/dc-dc_1-app.pdf ) for
suggestions on how to limit the magnitude of the inrush
current.
Figure 30. On/Off Control
(Common to –x & –N models)
The ON/OFF pin in the QMS converter functions as a
normal soft shutdown. The ON/OFF pin is pulled up
internally, so no external voltage source is required or
recommended. The user should avoid connecting a
resistor between the ON/OFF pin and the +Vin pin. The
ON/OFF pin is internally referenced to the –Vin pin. An
open collector switch is recommended to control the
voltage between these two points.
The controlling signal must not be referenced ahead of
EMI filtering, or remotely from the unit. Optical coupling the
control signal and locating the opto-coupler directly at the
converter, is recommended for trouble-free operation.
MCD10143 Rev.1.1, 30--Aug-10
Page 13 of 20
www.power-one.com
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