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參數(shù)資料
| 型號： | 12S12.5XW-I |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 60 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 5/7頁 |
| 文件大小： | 121K |
| 代理商： | 12S12.5XW-I |
A
50 to 60 XW Single Series DC/DC Converters
Manufacturing Company, Inc. Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
5
Each single output features provisions for remote sense
connections. These allow the power supply to correct for line
drops of up to 0.4 volts per leg. The remote sense connections
should be made with twisted pair wire or closely coupled PCB
traces. If the remote sense is not to be used, these pins must
be connected to their respective output pins for proper output
voltage accuracy and regulation. There is approximately 1 mA
of current flowing in the remote sense lines.
Care should be taken not to disconnect the output pins
before the remote sense pins while the converter is in operation.
If this happens the output load current will run down the sense
leads, possibly creating an output overvoltage condition that
could cause the internal transient suppressor on the output to
conduct. If the unit must be “Hot Plugged” in the intended
application, provisions should be made to disconnect the
sense leads before the power leads, disconnect the input
power first or use the remote ON/OFF to stop the converter’s
operation.
See our application note on remote sense and trim functions
for more information.
Grounding
The input and output sections are fully floating from each
other. They may be operated separately or with a common
ground. If the input and output sections are connected either
directly at the converter or at some remote location from the
converter it is suggested that a 3.3 to 10F, 0.5 to 5 ohm ESR
capacitor bypass be used directly at the converter output pins.
This capacitor prevents any common mode switching currents
from showing up at the converter’s output as normal mode
output noise. Do not use the lowest ESR, biggest value
capacitor that you can find! This can only lead to reduced
system performance or oscillation. See our application note
“Understanding Output Impedance For Optimum Decoupling”
for more information.
Case Grounding
The case serves not only as a heat sink but also as an EMI
shield. The case / header shield is tied to the -Input pin through
a 1.5 megohm resistor in parallel with a 0.01 F capacitor.
These connections are shown on the block diagram. The case
is floating from the output sections.
The noise performance of the converter may improve or
degrade with the case connected to other inputs or outputs
depending on your system grounding.
Remote ON/OFF Pin Operation
The remote ON/OFF pin may be left floating if this function is
not used. The equivalent input circuit for the ON/OFF pin is
shown in figure 3. The best way to drive this pin is with an open
collector/drain or relay contact. See our application note titled
“Understanding the Remote ON/OFF Function” for more
information on using the remote ON/OFF pin.
When the ON/OFF pin is pulled low with respect to the -
Input, the converter is placed in a low power drain state. When
Figure 3.
The simplified schematic of the XW Single Series’ ON/OFF pin. The
maximum open circuit voltage is clamped by the 13 volt zener. By
leaving this pin floating the converter will be in the ON state. When
the pin is pulled below 5 volts the converter is placed in the power
down or OFF state. See our application note on the remote ON/OFF
function for more information.
the ON/OFF pin is released the converter completely powers
up in typically 60 milliseconds. The ON/OFF pin turns the
converter off while keeping the input bulk capacitor fully
charged. This prevents the large inrush current spike that
occurs when the +input pin is opened and closed.
Temperature Derating/Mounting Options
The XW Single series can operate up to 85°C case temperature
without derating. Case temperature may be roughly calculated
from ambient by knowing that the XW Singles case temperature
rise is approximately 3.4° C per package watt dissipated.
For example: If the converter was outputting 40 watts, at what
ambient could it expect to run with no moving air and no extra
heatsinking?
Efficiency is approximately 85%. This leads to an input
power of 47 watts. The case temperature rise would be 7 watts
x 3.4 = 24°C. This number is subtracted from the maximum
case temperature of 85°C to get: 61°C.
This is a rough approximation of the maximum ambient
temperature. Because of the difficulty of defining ambient
temperature and the possibility that the load’s dissipation may
actually increase the local ambient temperature significantly,
these calculations should be verified by actual measurement
before committing to a production design.
Heat Sink Option
The XW Single can be ordered in a “-I” configuration which
provides a case with 4 X M3 inserts located on the top surface
of the case for attaching a heat sink or mounting the converter
on its back. The mounting surface should be flat to within
±0.01 inches to prevent warping the XW Single’s case.
The CALEX -HS heat sink was specially developed for this
model and can reduce the case temperature rise to below
2.4°C per watt with natural convection and even less with
moving air. It also increases the heat removing efficiency of
any cooling air flow.
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