AN833调频作者：L4981B

AN833调频作者：L4981B

AN833
APPLICATION NOTE

FREQUENCY MODULATION ON L4981B

Devices Description
Designing PFC, an important parameter to consider and control is the high frequency noise. This noise is pro-
duced by the switching itself and its level depends on several parameters such as high frequency current ripple,
PCB layout, active switch performance and also some particular circuital solutions.
The parameter to keep under control is the electromagnetic interference (EMI) content, versus the RFI norms
and design requirements (EN60555 and VDE0871B). To get more information about this, please refer also to
the CI