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Ericsson Internal
PRODUCT SPECIFICATION
3 (6)
Prepared (also subject responsible if other)
No.
ESKEVIN
3/1301-BMR628 Uen
Approved
Checked
Date
Rev
Reference
SEC/D (Julia You)
EYINGJI
2008-7-9
B
Operating information continued
Parallel Operation
Two converters may be paralleled for redundancy if the total
power is equal or less than PO max. It is not recommended to
parallel the converters without using external current sharing
circuits.
{See Design Note 006 for detailed information.}
Remote Sense
The DC/DC converters 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 converters are protected from thermal overload by an
internal over temperature shutdown circuit.
When Tref as defined in thermal consideration section
exceeds 180°C the converter will shut down. The DC/DC
converter will make continuous attempts to start up (non-
latching mode) and resume normal operation automatically
when the temperature has dropped >30°C below the
temperature threshold.
Over Voltage Protection (OVP)
In the event of an overvoltage condition due to malfunction in
the voltage monotoring circuits, the converter’s PWM
controller will automatically dictate minimum duty-cycle thus
reducing the output voltage to a minimum.
Over Current Protection (OCP)
The converters 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
converter will resume normal operation after removal of the
overload. The load distribution should be designed for the
maximum output short circuit current specified.
E
PKD 4000E SI series
DC/DC converters, Input 36-75 V, Output up to 20 A/50 W
EN/LZT 146 375 R2B July 2008
Ericsson Power Modules AB
16