Overview
The NCP1653, produced by onsemi, is a Power Factor Correction (PFC) boost controller designed for Continuous Conduction Mode (CCM) operation. This controller is optimized for high-power applications where cost-effectiveness, reliability, and high power factor are crucial. It operates in either peak current-mode or average current-mode and supports fixed-frequency operation, which simplifies compliance with EMI standards and reduces radiated noise. The NCP1653 is available in a compact 8-pin package, minimizing the number of external components and simplifying the design of PFC stages.
Key Specifications
| Characteristics | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Switching Frequency (NCP1653) | 90 | 100 | 110 | kHz |
| Switching Frequency (NCP1653A) | 60.3 | 67 | 73.7 | kHz |
| Maximum Duty Cycle (VM = 0 V) | - | - | 94 | % |
| Gate Drive Resistor (ROH) | 5.0 | - | 9.0 | Ω |
| Gate Drive Resistor (ROL) | 2.0 | - | 6.6 | Ω |
| Supply Voltage (VCC) | 8.0 | - | 14.5 | V |
| UVLO Startup Threshold (VCC(on)) | 12.25 | - | 13.25 | V |
| UVLO Hysteresis (VCC(H)) | 4.0 | - | 4.55 | V |
| Thermal Shutdown (TSD) | 120 | - | 150 | °C |
Key Features
- IEC1000-3-2 Compliant
- Continuous Conduction Mode (CCM) operation
- Average Current-Mode or Peak Current-Mode operation
- Constant Output Voltage or Follower Boost Operation
- Fixed Switching Frequency: 67 kHz (NCP1653A) and 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)
- Pb-Free Device
Applications
- TV & Monitors
- PC Desktop SMPS
- AC Adapters SMPS
- White Goods
Q & A
- What is the primary function of the NCP1653?
The NCP1653 is a Power Factor Correction (PFC) boost controller designed for Continuous Conduction Mode (CCM) operation.
- What are the switching frequencies for NCP1653 and NCP1653A?
The NCP1653 operates at a fixed switching frequency of 100 kHz, while the NCP1653A operates at 67 kHz.
- What protection features does the NCP1653 include?
The NCP1653 includes Overvoltage Protection (OVP), Undervoltage Protection (UVP), Overcurrent Protection (OCP), Overpower Limitation (OPL), and Thermal Shutdown (TSD).
- How does the follower boost mode benefit the PFC circuit?
The follower boost mode allows for a reduction in the output voltage, which in turn reduces the size and cost of the inductor and power MOSFET.
- What is the purpose of the VCC Undervoltage Lockout with Hysteresis?
The VCC Undervoltage Lockout with Hysteresis ensures that the device operates only when the supply voltage is within a safe range (8.7 / 13.25 V) to prevent malfunction.
- How does the soft-start capability work in the NCP1653?
The soft-start capability is implemented through the Vcontrol pin, which is connected to an external capacitor to limit the bandwidth and ensure a gradual startup.
- What is the significance of the thermal shutdown feature?
The thermal shutdown feature disables the device when the junction temperature exceeds 150°C and resumes operation when the temperature falls below a certain threshold.
- What are the typical applications of the NCP1653?
The NCP1653 is typically used in TV & Monitors, PC Desktop SMPS, AC Adapters SMPS, and White Goods.
- Is the NCP1653 a Pb-Free device?
Yes, the NCP1653 is a Pb-Free device.
- How does the NCP1653 simplify the design of PFC stages?
The NCP1653 simplifies the design by minimizing the number of external components required and integrating high safety protection features.
