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參數(shù)資料
| 型號： | RBC-12/25-D48PB-C |
| 廠商： | CD TECHNOLOGIES INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, PACKAGE-5 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大?。?/td> | 155K |
| 代理商： | RBC-12/25-D48PB-C |
RBC Models
R E G U L A T E D D C / D C B U S C O N V E R T E R S
RBC Series
Page 5 of 6
www.cd4power.com
Thermal Considerations and Thermal Protection
The typical output-current thermal-derating curves shown below enable
designers to determine how much current they can reliably derive from each
model of the RBC-12/25-D48 under known ambient-temperature and air-flow
conditions. Similarly, the curves indicate how much air flow is required to reli-
ably deliver a specific output current at known temperatures.
The highest temperatures in RBC-12/25-D48's occur at their output inductor,
whose heat is generated primarily by I
2
R losses. The derating curves were
developed using thermocouples to monitor the inductor temperature and
varying the load to keep that temperature below +110°C under the assorted
conditions of air flow and air temperature. Once the temperature exceeds
+125°C (approx.), the thermal protection will disable the converter using the
hiccup shutdown mode.
Distributed Bus Architecture
A revolution is at hand for powering dedicated mixed circuit systems. Instead
of installing a single large isolated power supply or multiple isolated convert-
ers, the new architecture uses one isolated power bus converter driving mul-
tiple Point-of-Load non-isolated DC/DC converters which are positioned right
where the power load is needed. While conceptually similar to having a single
master power supply and distrubuted linear regulators, the bus converter
Figure 3. Intermediate Bus Architecture
Undervoltage Shutdown
When the input voltage falls below the undervoltage threshold, the converter
will terminate its output. However, this is not a latching shutdown mode. As
soon as the input voltage rises above the Start-Up Threshold, the converter
will restore normal operation. This small amount of hysteresis prevents most
uncommanded power cycling. Since some input sources with higher output
impedance will increase their output voltage greater than this hysteresis as
soon as the load is removed, it is possible for this undervoltage shutdown to
cycle indefinitely. To prevent this, be sure that the input supply always has
adequate voltage at full load.
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Figure 4. Equivalent Voltage Source Model
Thermal Shutdown
Extended operation at excessive temperature will initiate overtemperature
shutdown triggered by a temperature sensor inside the PWM controller. This
operates similarly to overcurrent and short circuit mode. The inception point
of the overtemperature condition depends on the average power delivered,
the ambient temperature and the extent of forced cooling airflow.
Remote On/Off Control
The RBC-12/25-D48 may be turned off or on using the external remote
on/off control. Allow at least 15 milliseconds for either transition. This terminal
consists of a digital input to the internal PWM controller athrough a protective
resistor and diode.
The on/off input circuit should be CMOS logic referred to the –Input power
terminal however TTL or TTL-LS logic will also work or a switch to ground. If
preferred, you can even run this using a bipolar transistor in “open collector”
configuration or an “open drain” FET transistor. You may also leave this input
unconnected and the converter will run whenever input power is applied.
concept offers significantly lower cost, higher efficiency and therefore lower
temperatures, better reliability and longer service life. Bulky, expensive heat
sinks are eliminated and even a costly fan can be downsized or deleted.
To achieve these results, the isolation is concentrated in the bus converter
and the precise voltage regulation resides in the POL converters. Since
the high current power switching is located in the bus converter, designers
can arrange the best possible noise shielding, isolation layout and thermal
distribution. And, since most of the regulation is placed in the POL convert-
ers, the total system offers very high efficiency, important for battery-operated
and standby applictions. Typically, DATELs surface mount POL converters
are actually smaller than equivalent linear regulators, heat sinks and their
discrete components. Another benefit to the distributed power architecture is
that it eliminates digital crosstalk in tightly packed systems.
A further advantage is that multiple power voltages are implemented simply
by connecting POLs with different output voltages. Today’s modern systems
require several low power voltages. Many large ASIC’s, gate arrays and
programmable logic are powered from 3.3 Volts or lower. CPU’s use 2.5 or
lower voltages at considerable current. And legacy logic or I/O ports may run
from 5 Volts. It makes sense to provide separate power converters for each
of these sections. But they do not all need to be isolated, saving cost, board
area and heat buildup.
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相關(guān)代理商/技術(shù)參數(shù) |
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| RBC-12-D48NB-C | 制造商:MURATA-PS 制造商全稱:Murata Power Solutions Inc. 功能描述:Quarter Brick, Regulated Bus Converters |
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