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Key Steps to Design A Compact, High-Efficiency PFC Stage Using NCP1623A

Housed in either SOIC−8 or TSOP−6 packages, the NCP1623A is an extremely compact PFC controller designed to optimize the efficiency of your PFC stage throughout the load range. It also incorporates protection features for a rugged operation. More generally, NCP1623A is ideal in systems where cost−effectiveness, reliability, high power−factor and efficiency ratios are key requirements.

This paper describes the key steps to rapidly design a CrM/DCM PFC stage driven by the NCP1623. The process is illustrated in a practical 100−W, universal mains application:

• Maximum Output Power: 100 W
• Rms Line Voltage Range: from 90 V to 264 V
• Regulation output voltage:
      ♦ 250 V in low line (115−V mains)
      ♦ 390 V in high line (230−V mains).

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