Cirrus-logic AN349 Manual do Utilizador descarregar pdf (Página 6)

AN349

6 AN349REV1

Figure 9 shows the frequency profile across the line voltage for CS1601-based solution.

Figure 9. CS1601 Switching Frequency vs. Line Voltage at Low Line

Figure 10 shows the frequency of operation of the system across load and line condition.

Figure 10. Frequency of Operation Across Line and Load Condition

0 45 90 135 180 225 270 315 360

Phase Angle (degrees)

Switching Frequency (Khz)

DCM

DCM DCM

CRM

DCM

DCM DCM

CRM

Max Frequency (KHz)

Line Voltage (V)

90 147 265

Po > 40%

Po < 20%

181 230

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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Cirrus-logic AN349 Manual do Utilizador Página 6