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| 型号： | PKM4511EPI |
| 厂商： | ERICSSON POWER MODULES AB |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 50 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, QUARTER BRICK, 8 PIN |
| 文件页数： | 28/37页 |
| 文件大小： | 2036K |
| 代理商： | PKM4511EPI |
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EN/LZT 146 051 R7A Ericsson Power Modules, February 2007
PKM 4000E PI Datasheet
Operating Information
Over Temperature Protection (OTP)
The PKM 4000E Series DC/DC converters are protected
from thermal overload by an internal over temperature
shutdown circuit . When the PCB temperature adjacent to
the PWM control circuit exceeds 120 C the converter will
shut down immediately. The converter will make continuos
attempts to start up (non-latching mode) and resume normal
operation automatically when the temperature has dropped
>10C below the temperature threshold .
Input And Output Impedance
The impedance of both the power source and the load will
interact with the impedance of the DC/DC converter. It is
most important to have a ratio between L and C as low as
possible, i .e . a low characteristic impedance, both at the in-
put and output, as the converters have a low energy storage
capability. The PKM 4000E Series DC/DC converters have
been designed to be completely stable without the need
for external capacitors on the input or the output circuits .
The performance in some applications can be enhanced by
addition of external capacitance as described under maxi-
mum capacitive load . If the distribution of the input voltage
source to the converter contains significant inductance, the
addition of a 100F capacitor across the input of the con-
verter will help insure stability. This capacitor is not required
when powering the DC/DC converter from a low impedance
source with short, low inductance, input power leads .
Parallel Operation
The PKM 4000E Series DC/DC converters can be paralleled
for redundancy if external o-ring diodes are used in series
with the outputs . It is not recommended to parallel the PKM
4000E Series DC/DC converters for increased power without
using external current sharing circuits .
Maximum Capacitive Load
When powering loads with significant dynamic current
requirements, the voltage regulation at the load can be
improved by addition of decoupling capacitance at the load .
The most affective technique is to locate low ESR ceramic
capacitors as close to the load as possible, using several
capacitors to lower the effective ESR . These ceramic ca-
pacitors will handle short duration high-frequency compo-
nents of dynamic load changes . In addition, higher values of
electrolytic capacitors should be used to handle the mid-fre-
quency components . It is equally important to use good de-
sign practise when configuring the DC distribution system .
Low resistance and low inductance PCB (printed circuit
board) layouts and cabling should be used . Remember that
when using remote sensing, all resistance, inductance and
capacitance of the distribution system is within the feed-
back loop of the converter. This can affect on the convert-
ers compensation and the resulting stability and dynamic
response performance . As a “rule of thumb”, 100F/A of
output current can be used without any additional analysis .
For example with a 25A converter, values of decoupling
capacitance up to 2500 F can be used without regard to
stability. With larger values of capacitance, the load transient
recovery time can exceed the specified value . As much of
the capacitance as possible should be outside the remote
sensing loop and close to the load . The absolute maximum
value of output capacitance is 10 000 F. For values larger
than this, please contact your local Ericsson Power Modules
representative .
Current Limit Protection
The PKM 4000E Series DC/DC converters include current
limiting circuitry that allows them to withstand continuous
overloads or short circuit conditions on the output . The out-
put voltage will decrease towards zero for output currents in
excess of max output current (Iomax) .
The converter 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 .
Over Voltage Protection (OVP)
The PKM 4000E Series DC/DC converters have output over-
voltage protection . In the event of an overvoltage condition,
the converter will shut down immediately. The converter will
make continuous attempts to start up (non-latching mode)
and resume normal operation automatically.
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相关代理商/技术参数 |
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|---|---|
| PKM4511EPIHS | 制造商:Ericsson 功能描述:MOD. CONV. DC/DC - Bulk |
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| PKM4511EPIP-LA | 制造商:Ericsson 功能描述:DC DC CONVERTOR MODULE |
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| PKM4513EPI | 功能描述:DC/DC转换器 12 Vdc 4.2A Iso Input 36-75V 50W RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
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