Radiated EMS (Electro-Magnetic Fields)
Operating Information
Radiated EMS is measured according to test methods in
IEC Standard publ. 801-3. No deviation outside the VO
tolerance band will occur under the following conditions:
Fuse Considerations
To prevent excessive current from flowing through the input
supply line, in the case of a short-circuit across the converter
input, an external fuse should be installed in the non-earthed
input supply line. We recommend using a fuse rated at
approximately 2 to 4 times the value calculated in the formula
below:
Frequency range
0.01...200 MHz
200...1,000 MHz
1...12 GHz
Voltage level
3 Vrms/m
3 Vrms/m
10 Vrms/m
PO
max
Iin
=
max
Conducted EMS
(ηmin × V min
)
I
Electro Magnetic Susceptibility is measured by injection of
electrical disturbances on the input terminals. No deviation
outside the VO tolerance band will occur under the following
conditions:
Refer to the fuse manufacturer for further information.
Remote Control (RC)
Frequency range
30...300 MHz
Voltage level
1.0 Vrms
Turn-on or turn-off can be realized by using the RC-pin. If pin
11 is connected to pin 17 the power modules turns off. Normal
operation is achieved if pin 11 is open (NC). To ensure safe
turn-off the voltage difference between pin 11 and 17 shall be
less than 1.0V. RC is an open collector compatible input. A
sink capacity of 1mA is needed. (see fig. 1).
The signal is amplitude modulated with 1 kHz/80% and
applied in both differential and common mode.
ESD
Electro Static Discharge is tested according to IEC publ. 801-
2. No destruction will occur if the following voltage levels are
applied to any of the terminal pins:
PKF 4221A
Test
Voltage level
4 kV
2 kV
Air discharge
Contact discharge
EFT
Electrical Fast Transients on the input terminals could affect
the output voltage regulation causing functional errors on
the Printed Board Assembly (PBA). The PKF power modules
withstand EFT levels of 0.5 kV keeping VO within the
tolerance band and
Figure 1
2.0 kV without destruction. Tested according to IEC publ.
801-4.
Turn-on/off Input Voltage
The power module monitors the input voltage and will turn on
and turn off at predetermined levels set by means of external
resistors.
Output Ripple & Noise (VOac)
Output ripple is measured as the peak to peak voltage of the
fundamental switching frequency.
To increase VIon a resistor should be connected between pin
11 and 17 (see fig. 2).
The resistance is given by the following equation:
For VI>34.5V,
Rinnom=(2510-VI)/(VI-34.5) kΩ
VI is the desired turn-on input voltage. The values are nominal
and apply when the unadjusted module turns on at 34.5V.
To decrease VIon a resistor should be connected between pin
10 and 11 (see fig. 3). The resistance is given by the following
equation:
For 30.5<VI<34.5 V,
Rinnom=55×(VI-30.5)/(34.5-VI) kΩ
VI is the desired turn-on input voltage. The values are nominal
and apply when the unadjusted module turns on at 34.5V.
EN/LZT ꢀ46 040 RꢀA ©Ericsson Power Modules AB, October 2003
6
ERICSSON [ ERICSSON ]
