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Application Note

EMI Filter Modifications when

Replacing L6562 with CS1501

1. Introduction

The Cirrus Logic CS1501 PFC controller is designed to match industry standard critical conduction mode (CRM)

power factor correction (PFC) controllers, with minimal change to conventional designs. This note summarizes the

changes required in the EMI filter circuit of a 120W power supply (PSU), when a ST Microelectronics L6562 PFC is

replaced with a Cirrus Logic CS1501 PFC controller.

2. Overview

When replacing the L6562 PFC controller, care must be taken to ensure the EMI signature is not compromised. Dif-

ferent PFC controllers operate at different frequencies and in different operating modes, requiring EMI filters with

different impedance profiles. An example of maintaining EMI signature when converting from the L6562 to the

CS1501 is described here. For the purpose of simplicity, we will consider only the PFC portion of the PSU circuit.

Cirrus Logic Application Note AN349 gives complete instructions on how to replace the L652.

3. Filter Structure

Figure 1 illustrates the components in an EMI filter for a PFC boost using ST Microelectronics L6562.

Figure 1. EMI Filter for a 120W PSU with an L6562 Analog PFC Controller

PFC

CONTROLLER

NTC

Choke

Y-CAP

FUSE

X-CAP

DC_IN

AN359

JUL’11

AN359REV1

1 2 3 4

Résumé du contenu

Page 1 - Replacing L6562 with CS1501

Page 2 - 4. Test Results

AN3592 AN359REV1Table 1 lists the circuit components that influence the EMI filter’s impedance profile. Table 1. EMI Filter Components4. Test Results

Page 3 - 5. Changes to the EMI Filter

AN359AN359REV1 35. Changes to the EMI FilterThe following changes were implemented to create an EMI filter optimized for operation with the CS1501:- T

Page 4 - 7. Reference

AN3594 AN359REV16. SummaryFilters ease the design and qualification process of a PSU by suppressing EMI. The adaptation of an EMI filter tooptimize pe

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Cirrus-logic AN359 Manuel d'utilisateur

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Résumé du contenu

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