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參數(shù)資料
| 型號： | PKM4918LCPIPNBLASP |
| 廠商： | ERICSSON POWER MODULES AB |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 96 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT |
| 文件頁數(shù)： | 20/30頁 |
| 文件大?。?/td> | 596K |
| 代理商： | PKM4918LCPIPNBLASP |
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EN/LZT 146 035 R3D Ericsson Power Modules, June 2005
PKM 4000C Datasheet
Operating Information
Over Temperature Protection (OTP)
The PKM 4000C Series DC/DC converters are protected
from thermal overload by an internal over temperature
shutdown circuit. When the Pcb temperature (TC reference
point) exceeds the temperature trig point (120 °C) for the
OTP circuit the converter will cut down output power. The
converter will go into hiccup mode until safe operational
temperature is restored.
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 low characteristic impedance,
both at the input and output, as the converters have a low
energy storage capability. The PKM 4000C 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 maximum capacitive load. If the distribution
of the input voltage source to the converter contains
signicant inductance, the addition of a 100F capacitor
across the input of the converter 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 4000C 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
4000C Series DC/DC converters for increased power without
using external current sharing circuits.
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 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 capacitors will handle short duration high-frequency
components of dynamic load changes. In addition, higher
values of electrolytic 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 converter. This
can affect on the converters 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 specied 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 4000C 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
specied.
Over Voltage Protection (OVP)
The PKM 4000C Series DC/DC converters include output
overvoltage protection. In the event of an overvoltage condi-
tion due to malfunction in the voltage monitoring circuits, the
converter's PWM will automatically dictate minimum duty-
cycle thus reducing the output voltage to a minimum.
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