Ericsson Internal
EAB/FJB/GKF ETORHOL, EKAMAGN
PRODUCT SPECIFICATION
1 (6)
Prepared (also subject responsible if other)
No.
30/1301-BMR 450 00/02 Uen
12
Technical Specification
Approved
Checked
Date
Rev
EN/LZT 146 4R0e0feRre1nCce November 2008
BMR 450
EAB/FJB/GKF Torbjörn Holmberg
MICANWO
2008-11-06
D
© Ericsson AB
DC/DC Regulators, Input 4.5-14 V, Output 20 A/100 W
EMC Specification
Output ripple and noise
Conducted EMI measured according to test set-up and
standard MIL std 0141 - 58000.
The fundamental switching frequency is 320 kHz for
BMR 450.
Output ripple and noise is measured with the filter according to
figure below. A 50 mm conductor works as a small inductor
forming together with the two capacitances a damped filter.
50 mm conductor
Conducted EMI Input terminal value (typ)
Vout
Ceramic
Capacitor
0.1 µF
Tantalum
Capacitor
10 µF
+S
−S
GND
50 mm conductor
BNC-contact to
oscilloscope
Output ripple and noise test set-up.
Operating information
Input Voltage
The input voltage range, 4.5 - 14 V, makes the products easy
to use in intermediate bus applications when powered by a
non-regulated bus converter or a regulated bus converter.
See Ordering Information for input voltage range.
EMI without filter
Turn-off Input Voltage Range
The product monitors the input voltage and will turn-on and
turn-off at configured levels. The default turn-on input voltage
level setting is 4.5 V, whereas the corresponding turn-off input
voltage level is 4.25 V. Hence, the default hysteresis between
turn-on and turn-off input voltage is 0.25 V.
Remote Control
The product is equipped with a
remote control function, i.e., the
CTRL pin. The remote control can
be referenced to either the primary
Vext
Test set-up
negative input connection (GND) or
to an external voltage (Vext), which
is a 3 - 5 V positive supply voltage
in accordance with the SMBus
CTRL
GND
Layout recommendations
The radiated EMI performance of the product will depend on
the PCB layout and ground layer design. It is also important to
consider the stand-off of the product. If a ground layer is used,
it should be connected to the output of the product and the
equipment ground or chassis.
Specification version 2.0. The CTRL function allows the
product to be turned on/off by an external device like a
semiconductor or mechanical switch. By default the product
will turn on with the CTRL pin is left open and turn off when
the CTRL pin is applied to GND. The CTRL pin has an internal
pull-up resistor. The maximum required sink current is 0.5 mA.
When the CTRL pin is left open, the voltage generated on the
CTRL pin is max 6 V.
A ground layer will increase the stray capacitance in the PCB
and improve the high frequency EMC performance.
Please contact your local Ericsson Power Modules
representative for custom configurations.
ERICSSON [ ERICSSON ]
