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| 型号： | PKL4311PIPTSP |
| 厂商： | ERICSSON POWER MODULES AB |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 300 W DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 33/42页 |
| 文件大小： | 828K |
| 代理商： | PKL4311PIPTSP |
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39
EN/LZT 146 047 R4A Ericsson Power Modules, June 2004
PKL 4000 Series Datasheet
Operating Information
Over Temperature Protection (OTP)
The PKL 4000 Series DC/DC converters are protected from
thermal overload by an internal over temperature shutdown
circuit. When the baseplate or case temperature exceeds 110 °C
(PKL4118B 120 °C) the converter will shut down immediately
(latching). The converter can be restarted by cycling the input
voltage or using the remote control function.
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
input and output, as the converters have a low energy storage
capability. The PKL 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 PKL 4000 Series DC/DC converters can be paralleled safely
without any external components, however good matching
between the initial voltage setting and the layout impedence/
resistance can change the performance. Please consult with your
Ericsson representative should parallelling the PKL 4000 series
for increased power be desired.
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 practice
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 feedback loop of the
converter. This can have affect on the converters compensation
and the resulting stability and dynamic response performance.
As a “rule of thumb”, 100
F/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 PKL 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).
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 PKL 4000 Series DC/DC converters have latching
output overvoltage protection. In the event of an over-voltage
condition, the converter will shut down immediately. The
converter can be restarted by cycling the input voltage or using
the remote control function.
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