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参数资料
| 型号： | PMA4118HSF/B |
| 厂商： | ERICSSON POWER MODULES AB |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 18 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | SMT-14 |
| 文件页数： | 9/21页 |
| 文件大小： | 363K |
| 代理商： | PMA4118HSF/B |
17
PMA 4000 Series Datasheet
EN/LZT 146 012 R3A Ericsson Power Modules, November 2003
Over Temperature Protection (OTP)
The PMA 4000 Series DC/DC regulators are protected from
thermal overload by an internal over temperature shutdown
circuit. When the case temperature (center of case ) exceeds
140 C the regulator will shut down immediately.
The regulator will return to normal operation when the over
temperature degrades.
Input And Output Impedance
The impedance of both the power source and the load will
interact with the impedance of the DC/DC regulator. It is
most important to have a low characteristic impedance, both
at the input and output, as the regulators have a low energy
storage capability. Use capacitors across the input if the source
inductance is greater than 4.7H. Suitable input capacitors are
47F-220F low ESR ceramics.
Max output capacitance is 5000F. The use of low ESR
capacitors is important and should be <15 m
.
Parallel Operation
The PMA 4000 Series DC/DC regulators can be connected in
parallel with a common input. Paralleling is accomplished by
connecting the output voltage pins directly and using a load
sharing device on the input. Layout considerations should be
made to avoid load imbalance and it is recommended not to use
more power than that of each individual regulator. For more
details on paralleling, please consult the separate Application
Note AN202A.
Maximum Capacitive Load
When powering loads with signicant dynamic current
requirements, the voltage regulation at the load can be
improved by addition of decoupling capacitance at the load.
The most effective technique is to locate low ESR ceramic
capacitors as close to the load as possible, using several
capacitors to lower the total ESR. These ceramic capacitors will
handle short duration high-frequency components of dynamic
load changes. In addition, higher values of capacitors should
be used to handle the mid-frequency components. It is equally
important to use good design practise when conguring the
DC distribution system.
Low resistance and low inductance PCB layouts and cabling
should be used. Remember that when using remote sensing,
all resistance, inductance and capacitance of the distribution
system is within the feedback loop of the regulator. This
can affect on the regulators compensation and the resulting
stability and dynamic response performance. The PMA 4000
series regulator can accept up to 5mF of capacitive load on the
output at full load. This gives <500F/A of IO.
Current Limit Protection
The PMA 4000 Series DC/DC regulators include current
limiting circuitry that allows them to withstand continuous
overloads or short circuit conditions on the output. The current
limit is of hick-up mode type.
The regulator will resume normal operation after removal of the
overload. The load distribution system should be designed to
carry the maximum output short circuit current specified.
Operating Information
Output Voltage Adjust (Vadj)
All PMA 4000 Series DC/DC regulators have an Output
Voltage adjust pin (Vadj). This pin can be used to adjust the
output voltage above or below Output voltage initial setting.
Note that at increased output voltages the maximum power
rating of the regulator remains the same, and the output
current capability will decrease correspondingly. To decrease
the output voltage the resistor should be connected between
Vadj pin and the Sense pin. To increase the voltage the resistor
should be connected between Vadj pin and the GND pin. The
resistor value of the Output voltage adjust function is according
to information given under the output section.
Circuit conguration for output voltage adjust
+Out
GND
Vadj
Load
Radj
Decrease
Increase
+Out
GND
Vadj
Load
Radj
Sense
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