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EN/LZT 146 32 R1A (Replaces EN/LZT 137 27 R3) © Ericsson Microelectronics, June 2000

EMC Specifications

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

2.0 kV without destruction. Tested according to IEC publ. 801-4.

Output ripple is measured as the peak to peak voltage of the funda-

mental switching frequency.

Operating Information

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 2.0 V. RC is an

TTL open collector compatible output with a sink capacity >300

mA

(see fig. 1).

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:

For further information, please refer to the fuse manufacturer .

(

The fundamental switching frequency is 510 kHz ± 26 kHz.

Frequency range

Voltage level

0.15...300 MHz

The signal is amplitude modulated with 1 kHz/80% and applied

both differential and common mode.

Conducted EMS

Electro Magnetic Susceptibility is measured by injection of elec-

trical disturbances on the input terminals. No deviation outside

Conducted EMI (input teminals)

PKF series typical conducted EMI performance

Test set up

The PKF meets class A in VDE 0871/0878, FCC Part 15J, and CISPR 22

(EN 55022), except for the fundamental switching frequency.

Radiated EMS (Electro-Magnetic Fields)

Radiated EMS is measured according to test methods in

band will occur under the following conditions:

Frequency range

Voltage level

0.01...200 MHz

200...1,000 MHz

1...12 GHz

Test

Voltage level

Air discharge

±4 kV

Contact discharge

±2 kV

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:

Figure 1

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 5 V output applica-

tions, but can easily be adjusted for other output voltages and the

desired OVP level.