PKY2616PIM Datasheet, PDF (10/17 Pages) Ericsson – PKY 2000 PI series DC/DC converters, Input 18-36 V, Output 21.5 A/600 W

E
Ericsson Internal
PRODUCT SPECIFICATION
Prepared (also subject responsible if other)
No.
EJANLLI
3/1301-BMR 638_T/2_eU_ce_hn_{nical Specification}
Approved
S^PE^KC^Y/D²(⁰J⁰ul⁰ia^PY^Io^su)^eries
Checked
Date
ECHWANG 2008-10-24
Rev
Reference
E_EN/LZT 146 385 R2B March 2011
DC/DC converters, Input 18-36 V, Output 21.5 A/600 W
© Ericsson Power Modules AB
2 (6)
10
Operating information
Input Voltage
addition of a 470 μF/40 V 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 below10 μH.
The input voltage range is 18 to 36Vdc.
At input voltages exceeding 36 V, the power loss will be
higher than at normal input voltage and T_ref must be limited to
absolute max +110°C. The absolute maximum continuous
input voltage is 40 Vdc.
Turn-off Input Voltage
The DC/DC 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.
Remote Control (RC)
The modules are equipped with a remote On/Off control
function. An optocoupler in the remote control circuit
provides a galvanic isolation (1500V DC minimum) between
the remote control pins and the rest of the module’s circuity.
Positive and negative RC logic options are available.
Cycling (Off and On sequence) of the RC input will restart the
module if latched after activation of the output overvoltage
protection function.
The standard version has a “positive logic” remote control
and the module will be off until a sufficient current between
the RC pins is provided.
The figure above presents an example of a circuit which turns
on the standard version module. The minimum current to
guarantee the activation of the RC input is 1,5mA. The
minimum activation voltage over the RC pins is 5.0V. To
guarantee that the RC input is not activated, the current must
be lower than 50μA or the voltage lower than 1,3V.
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,
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
ESR of the capacitors is a very important parameter. Power
Modules guarantee stable operation with a verified ESR value
of >10 mΩ across the output connections.
For further information please contact your local Ericsson
Power Modules representative.
Output Voltage Adjust (V_adj)
The product has an Output Voltage Adjust pin (V_adj). This pin
can be used to adjust the output voltage above or below
Output voltage initial setting.
When increasing the output voltage, the voltage at the output
pins (including any remote sense compensation ) must be
kept below the threshold of the over voltage protection, (OVP)
to prevent the converter from shutting down. 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 V_adj pin and +Sense pin. 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 V_adj pin and —Sense pin.
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 to be stable without
external capacitors on input or output. However, the module
performance can be enhanced by adding external capacitors
as described under External Decoupling Capacitors.
If the input voltage source contains significant inductance, the