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参数资料
| 型号： | PKR4928ASI |
| 厂商： | ERICSSON POWER MODULES AB |
| 元件分类： | 电源模块 |
| 英文描述： | 2-OUTPUT 9.5 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, SMD-18 |
| 文件页数： | 14/30页 |
| 文件大小： | 1444K |
| 代理商： | PKR4928ASI |
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EYINGJI
3/1301-BMR 640 1411+ Uen
Approved
Checked
Date
Rev
Reference
SEC/D (Julia You)
EJANLLI
2009-4-10
F
Operating information
Input Voltage
The input voltage range 36…75Vdc meets the requirements
of the European Telecom Standard ETS 300 132-2 for normal
input voltage range in —48 and —60 Vdc systems,
-40.5…-57.0 V and —50.0…-72 V respectively.
At input voltages exceeding 75 V, the power loss will be
higher than at normal input voltage and Tref must be limited to
absolute max +95°C. The absolute maximum continuous
input voltage is 75 Vdc.
Turn-off Input Voltage
The converters monitor the input voltage and will turn on and
turn off at predetermined levels. The minimum hysteresis
between turn on and turn off input voltage is 1V.
To increase V
Ion a resistor should be connected between pin
11 and 17. The resistance is given by the following equation:
R
set(up) = (X - Von)/(Von - VIon) kΩ
To decrease V
Ion a resistor should be connected between pin
10 and 11. The resistance is given by the following equation:
R
set(down) = 51(Von - Y)/(VIon - Von) kΩ
Variants/Parameters
V
ion
X
Y
PKR4910A
34.8
2583
30.4
PKR4211A
PKR4117A
34.5
2549
30.1
PKR4928A
PKR4221A
35.2
2616
30.8
V
off is the adjusted turn-off input voltage and is determined by
V
on - Voff = 1.2V (Typical value).
Remote Control (RC)
The products are fitted with a
remote control function referenced
to the primary negative input
connection (- In), and have positive
logic. The RC function allows the
converter to be turned on/off by an
external device like a
semiconductor or mechanical
switch.
The maximum required sink current is 1 mA. When the RC pin
is left open, the voltage generated on the RC pin is
<16 V. To ensure that the converter stays off the voltage must
be below 1.0 V.
Input and Output Impedance
The impedance of both the input source and the load will
interact with the impedance of the DC/DC converter. It is
important that the input source has low characteristic
impedance. The converters are designed for stable operation
without external capacitors connected to the input or output.
The performance in some applications can be enhanced by
addition of external capacitance as described under External
Decoupling Capacitors. If the input voltage source contains
significant inductance, the addition of a 10 μF capacitor
across the input of the converter will ensure stable operation.
The capacitor is not required when powering the DC/DC
converter from an input source with an inductance below 10
μH.
External Decoupling Capacitors
When powering loads with significant dynamic current
requirements, the voltage regulation at the point of load can
be improved by addition of decoupling capacitors at the load.
The most effective technique is to locate low ESR ceramic
and electrolytic capacitors as close to the load as possible by
using several parallel capacitors to lower the effective ESR.
The ceramic capacitors will handle high-frequency dynamic
load changes while the electrolytic capacitors are used to
handle low frequency dynamic load changes. Ceramic
capacitors will also reduce any high frequency noise at the
load.
It is equally important to use low resistance and low
inductance PCB layouts and cabling.
External decoupling capacitors will become part of the
control loop of the DC/DC converter and may affect the
stability margins. As a “rule of thumb”, 100 μF/A of output
current can be added without any additional analysis.
The recommended absolute maximum value of output
capacitance is 10 000 μF. For further information please
contact your local Ericsson Power Modules representative.
Output Voltage Adjust (Vadj)
All converters have an Output Voltage Adjust pin (Vadj). This
pin can be used to adjust the output voltage above or below
Output voltage initial setting.
At increased output voltages the maximum power rating of
the converter remains the same, and the max output current
must be decreased correspondingly.
To increase the voltage the resistor should be connected
between the Vadj pin and -IN. The resistor value of the Output
voltage adjust function is according to information given
under the Output section for the respective product.
To decrease the output voltage, the resistor should be
connected between the Vadj pin and NOR pin.
E
PKR 4000A PI
DC/DC Converters, Input 36-75 V, 3 A / 15 W
EN/LZT 146 300 R5F April 2009
Ericsson AB
Technical Specication
21
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