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| 型号： | PKB4418PIPOANBLA |
| 厂商： | ERICSSON POWER MODULES AB |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 45 W DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 13/23页 |
| 文件大小： | 367K |
| 代理商： | PKB4418PIPOANBLA |
20
EN/LZT 146 033 R1D Ericsson Power Modules, June 2004
PKB 4000 Datasheet
Operating Information
Over Temperature Protection (OTP)
The PKB 4000 Series DC/DC converters are protected from
thermal overload by an internal over temperature shutdown
circuit. When the PCB temperature on the topside between
the input capacitors and main transformer exceeds 120
°C
the converter will shut down immediately. The converter will
make continuous attempts to start up (non-latching mode) and
resume normal operation automatically when the temperature
has dropped 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 low characteristic impedance, both at the
input and output, as the converters have a low energy storage
capability. The PKB 4000 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 significant inductance, the addition of a
100 F 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 PKB 4000 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 PKB 4000 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 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 configuring 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 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 PKB 4000 Series DC/DC converters include current
limiting circuitry that allows them to withstand continuous
overloads or short circuit conditions on the output. The output
voltage will decrease towards zero for output currents in excess
of max output current (Iomax).
When the over-current condition remains for a longer time the
converter will enter a second mode of current limit protection,
whereby the converter shuts down and makes continuous at-
tempts to start up (non-latching mode).
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 PKB 4000 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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