Overview
The NCP1653DR2G, produced by onsemi, is a Power Factor Correction (PFC) boost controller designed for Continuous Conduction Mode (CCM) operation. This controller is optimized for fixed-frequency operation, which simplifies compliance with EMI standards and reduces radiated noise. The NCP1653DR2G is housed in a compact SO-8 package, minimizing the number of external components required and thus simplifying the design and reducing costs. It is particularly suited for high-power applications where cost-effectiveness, reliability, and high power factor are crucial.
Key Specifications
| Characteristics | Min | |||
|---|---|---|---|---|
| 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 (Output High) | 5.0 | - | 9.0 | Ω |
| Gate Drive Resistor (Output Low) | 2.0 | - | 6.6 | Ω |
| Supply Voltage | 8.0 | - | 14.5 | V |
| UVLO Startup Threshold | 8.7 | - | 13.25 | V |
| UVLO Hysteresis | 4.0 | - | 4.55 | V |
| Thermal Shutdown | 120 | - | 150 | °C |
Key Features
- IEC1000-3-2 Compliant
- Continuous Conduction Mode (CCM)
- 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 (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)
- Pb-Free Device
Applications
- TV & Monitors
- PC Desktop SMPS
- AC Adapters SMPS
- White Goods
Q & A
- What is the primary function of the NCP1653DR2G?
The NCP1653DR2G 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 NCP1653DR2G include?
The NCP1653DR2G includes overvoltage protection, undervoltage protection, overcurrent protection, overpower limitation, and thermal shutdown.
- What is the purpose of the follower boost mode in the NCP1653DR2G?
The follower boost mode allows for a reduction in the size and cost of the inductor and power MOSFET by not setting the output voltage at a constant level but rather making it dependent on the RMS input voltage or load demand.
- What is the significance of the VCC undervoltage lockout with hysteresis?
The VCC undervoltage lockout with hysteresis ensures that the device operates only within a safe voltage range (8.7 / 13.25 V) to prevent damage and maintain stability.
- How does the soft-start capability benefit the system?
The soft-start capability, achieved through the Vcontrol pin and an external capacitor, gradually ramps up the power factor, preventing sudden surges and ensuring a smooth startup.
- What is the thermal shutdown threshold for the NCP1653DR2G?
The thermal shutdown threshold is between 120°C and 150°C, ensuring the device shuts down to prevent overheating and potential damage.
- What are some typical applications for the NCP1653DR2G?
Typical applications include TV & monitors, PC desktop SMPS, AC adapters SMPS, and white goods.
- Is the NCP1653DR2G a Pb-Free device?
Yes, the NCP1653DR2G is a Pb-Free device, complying with environmental regulations.
- How does the NCP1653DR2G simplify PFC circuit design?
The NCP1653DR2G simplifies PFC circuit design by requiring very few external components and integrating multiple protection features, making the overall design more compact and cost-effective.
- What is the role of the feedback pin (FB/SD) in the NCP1653DR2G?
The feedback pin receives a feedback current proportional to the PFC circuit output voltage, used for output regulation, overvoltage protection, and undervoltage protection.
