Overview
The NCP1653APG, produced by onsemi, is a Power Factor Correction (PFC) boost controller designed to operate in fixed-frequency Continuous Conduction Mode (CCM). This controller is ideal for high-power applications where cost-effectiveness, reliability, and high power factor are crucial. It is available in a compact 8-pin package, either in DIP-8 or SO-8, which minimizes the number of external components and simplifies the design and implementation of PFC stages.
Key Specifications
| Characteristics | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Switching Frequency (NCP1653A) | 60.3 | 67 | 73.7 | kHz |
| Supply Voltage | 8.75 | - | 18 | V |
| UVLO Startup Threshold | 12.25 | 13.25 | 14.5 | V |
| UVLO Hysteresis | 4.0 | 8.7 | 9.5 | V |
| Maximum Duty Cycle | - | - | 94 | % |
| Gate Drive Resistor (Output High) | 5.0 | - | 9.0 | Ω |
| Gate Drive Resistor (Output Low) | 2.0 | - | 6.6 | Ω |
| Thermal Shutdown | 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
- Very few external components required
- Fixed Switching Frequency: 67 kHz for NCP1653A
- Soft-Start Capability
- VCC Undervoltage Lockout with Hysteresis
- 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 NCP1653APG?
The NCP1653APG is a Power Factor Correction (PFC) boost controller designed for Continuous Conduction Mode (CCM) operation.
- What are the available switching frequencies for the NCP1653 and NCP1653A?
The NCP1653 operates at a fixed switching frequency of 100 kHz, while the NCP1653A operates at 67 kHz.
- What is the UVLO startup threshold for the NCP1653APG?
The UVLO startup threshold is 13.25 V with a hysteresis of 8.7 V.
- What protection features does the NCP1653APG include?
The device includes Overvoltage Protection (OVP), Undervoltage Protection (UVP), Overcurrent Protection, Overpower Limitation, and Thermal Shutdown.
- How does the follower boost mode benefit the PFC circuit?
The follower boost mode reduces the output voltage, which in turn reduces the size and cost of the inductor and power MOSFET.
- What is the purpose of the Vcontrol pin?
The Vcontrol pin directly controls the input impedance and hence the power factor of the circuit. It also acts as a soft-start capacitor.
- How is the output voltage regulated in the NCP1653APG?
The output voltage is regulated using a feedback current IFB that represents the output voltage, processed in conjunction with a reference current.
- What are the typical applications of the NCP1653APG?
Typical applications include TV & Monitors, PC Desktop SMPS, AC Adapters SMPS, and White Goods.
- Is the NCP1653APG a Pb-Free device?
- What is the thermal shutdown range for the NCP1653APG?
The thermal shutdown range is between 120°C and 150°C with hysteresis.
