onsemi NCP1653ADR2G

The NCP1653 is a Power Factor Correction (PFC) boost controller designed to operate in fixed−frequency Continuous Conduction Mode (CCM). It can operate in either peak current−mode or average current−mode. Fixed−frequency operation eases the compliance with EMI standards and the limitation of the possible radiated noise that may pollute surrounding systems. The CCM operation reduces the application di/dt and the resulting interference. The NCP1653 is designed in a compact 8−pin package which offers the minimum number of external components. It simplifies the design and reduces the cost. The output stage of the NCP1653 incorporates ±1.5 A current capability for direct driving of the MOSFET in high−power applications. The NCP1653 is implemented in constant output voltage or follower boost modes. The follower boost mode permits one to significantly reduce the size of the PFC circuit inductor and power MOSFET. With this technique, the output voltage is not set at a constant level but depends on the RMS input voltage or load demand. It allows lower output voltage and hence the inductor and power MOSFET size or cost are reduced. Hence, NCP1653 is an ideal candidate in high−power applications where cost−effectiveness, reliability and high power factor are the key parameters. The NCP1653 incorporates all the necessary features to build a compact and rugged PFC stage. The NCP1653 provides the following protection features:

1. Overvoltage Protection (OVP) is activated and the Drive Output (Pin 7) goes low when the output voltage exceeds 107% of the nominal regulation level which is a user−defined value. The circuit automatically resumes operation when the output voltage becomes lower than the 107%.
2. Undervoltage Protection (UVP) is activated and the device is shut down when the output voltage goes below 8% of the nominal regulation level. The circuit automatically starts operation when the output voltage goes above 12% of the nominal regulation level. This feature also provides output open−loop protection, and an external shutdown feature.
3. Overpower Limitation (OPL) is activated and th

• IEC1000−3−2 Compliant
• Continuous Conduction Mode
• Average Current−Mode or Peak Current−Mode Operation
• Constant Output Voltage or Follower Boost Operation
• Very Few External Components
• Fixed Switching Frequency: 67 kHz = NCP1653A, 100 kHz = NCP1653
• Soft−Start Capability
• VCC Undervoltage Lockout with Hysteresis (8.7 / 13.25 V)
• Overvoltage Protection (107% of Nominal Output Level)
• Undervoltage Protection or Shutdown (8% of Nominal Output Level)
• Programmable Overcurrent Protection
• Programmable Overpower Limitation
• Thermal Shutdown with Hysteresis (120 / 150°C)
• This is a Pb−Free Device

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