The effects of a radio frequency conducted disturbing signal are evaluated on several pin-to-pin compatible control integrated circuits (IC) for PWM current-mode switching power supplies. The tested ICs were selected between some common models available on the market. The variations of the primary functional parameters (inner voltage reference, switching frequency, etc.) are investigated in conditions of different frequency and amplitude for the interfering signal. A dedicated PCB for the measurements was developed paying particular attention to HF layout. Also, the impact of underground condition (voltage at one pin below ground reference) on ICs’ behaviour is analysed. The paper gives a comparative view of the results, focusing on the key macroscopic effects.
Effects of RFI and Underground Condition on PWM Current-Mode Integrated Circuits for SMPS
BUSO, SIMONE;SPIAZZI, GIORGIO;
2002
Abstract
The effects of a radio frequency conducted disturbing signal are evaluated on several pin-to-pin compatible control integrated circuits (IC) for PWM current-mode switching power supplies. The tested ICs were selected between some common models available on the market. The variations of the primary functional parameters (inner voltage reference, switching frequency, etc.) are investigated in conditions of different frequency and amplitude for the interfering signal. A dedicated PCB for the measurements was developed paying particular attention to HF layout. Also, the impact of underground condition (voltage at one pin below ground reference) on ICs’ behaviour is analysed. The paper gives a comparative view of the results, focusing on the key macroscopic effects.
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