10
PMA 5000 Series Datasheet
EN/LZT 146 034 R1B Ericsson Power Modules, November 2003
EMC Specication
Layout Recommendation
The radiated EMI performance of the DC/DC regulator will be
optimised by including a ground plane in the PCB area under
the DC/DC regulator. This approach will return switching
noise to ground as directly as possible, with improvements to
both emission and susceptibility.
Operating Information
Remote Control (RC)
The PMA 5000 Series DC/DC regulators have remote control
function, with both negative and positive logic options. The
RC function is CMOS open drain compatible. Maximum sink
current is 1mA. The (RC) and (Select) pins have identical
functions meaning that the functions may be inverted. If either
one of the pins is shorted to ground the regulator is turned
off. If both pins are are shorted to ground or both pins are
disconnected the regulator is turned on.
Positive logic:
To choose positive logic, leave the Select pin open = 1.
Negative logic:
To choose negative logic, connect the Select pin to GND = 0.
With the RC pin, i.e. with a suitable open collector function,
the ON/OFF condition of the regulator may be controlled.
All PMA 5000 Series DC/DC regulators have a positive remote
sense pin that can be used to compensate for moderate amounts
of resistance in the distribution system and allow for voltage
regulation at the load or other selected point. The remote sense
line will carry very little current and does not need a large cross
sectional area. However, the sense line on the PCB should be
located close to a ground trace or ground plane. The remote
sense circuitry will compensate for up to 10% voltage drop
between the sense voltage and the voltage at the output pins
from VOnom. If the remote sense is not needed the sense pin
should be connected to +Out.
Remote Sense
RC
Select
Regulator condition
0
ON
1
0
OFF
0
1
OFF
11
ON
0= Dened as low voltage level, 0-0.3V
1= Dened as high voltage level, approx. 4V, (internal level)