EMC Specifications
EFT
The fundamental switching frequency is 510 kHz 26 kHz.
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
2.0 kV without destruction. Tested according to IEC publ. 801-4.
Conducted EMI (input teminals)
Output Ripple & Noise (VOac)
Output ripple is measured as the peak to peak voltage of the funda-
mental switching frequency.
Operating Information
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:
PKF series typical conducted EMI performance
Test set up
POmax
Iinmax =
(hmin × V min
)
I
For further information, please refer to the fuse manufacturer .
The PKF meets class A in VDE 0871/0878, FCC Part 15J, and CISPR 22
(EN 55022), except for the fundamental switching frequency.
Remote Control (RC)
Turn-on or turn-off can be realized by using the RC-pin. If pin 11 is
connected to pin 17 the power module 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 2.0V. RC is an
TTL open collector compatible output with a sink capacity >300 mA
(see fig. 1).
Conducted EMS
Electro Magnetic Susceptibility is measured by injection of elec-
trical disturbances on the input terminals. No deviation outside
the VO tolerance band will occur under the following conditions:
Frequency range
0.15...300 MHz
Voltage level
1.0 Vrms
The signal is amplitude modulated with 1 kHz/80% and applied
both differential and common mode.
Radiated EMS (Electro-Magnetic Fields)
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:
Frequency range
0.01...200 MHz
200...1,000 MHz
1...12 GHz
Voltage level
3 Vrms/m
3 Vrms/m
10 Vrms/m
Figure 1
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:
Over Voltage Protection (OVP)
The remote control can also be utilized for OVP by using the exter-
nal circuitry in figure 2. Resistor values are for 5V output applica-
tions, but can easily be adjusted for other output voltages and the
desired OVP level.
Test
Voltage level
4 kV
Air discharge
Contact discharge
2 kV
EN/LZT 146 32 R1A (Replaces EN/LZT 137 27 R3) ©Ericsson Microelectronics, June 2000
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