Ericsson Internal
E
EAB/FJB/GMF Oscar Persson
PRODUCT SPECIFICATION
3 (5)
Prepared (also subject responsible if other)
No.
3/1301-BMR 662 00+ Uen
15
Technical Specification
Approved
Checked
Date
Rev
Reference
EN/LZT 146 420 R3A March 2014
PKB 4000A series Direct Converters
Input 36-72 V, Output up to 30 A / 125 W
EAB/FJB/GMF [Natalie Johansson]
MICJAKE
2010-04-11
B
© Ericsson AB
Pre-bias Start-up
The products do not support pre-biased start up with zero
reverse current.
Thermal Consideration
General
The products are designed to operate in different thermal
environments and sufficient cooling must be provided to
ensure reliable operation.
Cooling is achieved mainly by conduction, from the pins to the
host board, and convection, which is dependant on the airflow
across the product. Increased airflow enhances the cooling of
the product. The Output Current Derating graph found in the
Output section for each model provides the available output
current vs. ambient air temperature and air velocity at
VI = 53 V.
Parallel Operation
Two products may be paralleled for redundancy if the total
power is equal or less than PO max. It is not recommended to
parallel the products without using external current sharing
circuits.
See Design Note 006 for detailed information.
The product is tested on a 254 x 254 mm, 35 µm (1 oz),
16-layer test board mounted vertically in a wind tunnel with a
cross-section of 608 x 203 mm.
Remote Sense
The products have remote sense that can be used to
compensate for voltage drops between the output and the
point of load. The sense traces should be located close to the
PCB ground layer to reduce noise susceptibility. The remote
sense circuitry will compensate for up to 10% voltage drop
between output pins and the point of load.
If the remote sense is not needed +Sense should be
connected to +Out and -Sense should be connected to -Out.
Over Temperature Protection (OTP)
The products are protected from thermal overload by an
internal over temperature shutdown circuit.
When TP1 as defined in thermal consideration section exceeds
140°C the product will shut down. The product will make
continuous attempts to start up (non-latching mode) and
resume normal operation automatically when the temperature
has dropped >15°C below the temperature threshold.
Over Voltage Protection (OVP)
The products have output over voltage protection that will shut
down the product in over voltage conditions. The product will
make continuous attempts to start up (non-latching mode) and
resume normal operation automatically after removal of the
over voltage condition.
Over Current Protection (OCP)
The products include current limiting circuitry for protection at
continuous overload. The output voltage will decrease towards
zero for output currents in excess of max output current (max
IO). The product will resume normal operation after removal of
the overload. The load distribution should be designed for the
maximum output short circuit current specified.
ERICSSON [ ERICSSON ]
