Professional IC Distribution & Technical Solutions

The NCP1654BD65R2G is a power factor correction (PFC) controller IC manufactured by ON Semiconductor.

Key Specifications:

• Manufacturer: ON Semiconductor
• Package: SOIC-8
• Input Voltage Range: 10.5V to 20V
• Operating Frequency: Up to 250 kHz
• Control Method: Average Current Mode
• Output Voltage Regulation: Adjustable
• Supply Current (Typical): 3.5 mA
• Operating Temperature Range: -40°C to +125°C
• Features Overvoltage Protection (OVP), Undervoltage Lockout (UVLO), and Soft-Start

Descriptions and Features:

• Designed for boost PFC applications in AC-DC power supplies.
• Average current mode control ensures high power factor (>0.99) and low THD.
• Supports universal input voltage (85VAC to 265VAC).
• Integrated protections include overvoltage, brownout detection, and thermal shutdown.
• Low startup and operating current for improved efficiency.
• Adjustable output voltage for flexible design requirements.

This IC is commonly used in SMPS, LED drivers, and industrial power supplies requiring high-efficiency power factor correction.

# NCP1654BD65R2G: Application Scenarios, Design Pitfalls, and Implementation Considerations

## Practical Application Scenarios

The NCP1654BD65R2G from ON Semiconductor is a high-performance, critical conduction mode (CrM) PFC controller designed for power factor correction in AC-DC power supplies. Its primary applications include:

• Server and Telecom Power Supplies: The IC ensures high power factor (>0.95) and low harmonic distortion, meeting stringent efficiency standards like 80 PLUS Titanium.
• LED Lighting Drivers: Used in high-power LED drivers to improve efficiency and comply with IEC 61000-3-2 harmonic standards.
• Industrial Power Systems: Enhances power quality in motor drives, inverters, and UPS systems by minimizing reactive power losses.
• Consumer Electronics: Integrated into adapters and chargers for laptops, gaming consoles, and appliances requiring high-efficiency PFC.

The NCP1654BD65R2G operates in boundary conduction mode (BCM), optimizing switching losses and EMI performance. Its wide input voltage range (85–265 VAC) makes it suitable for universal mains applications.

## Common Design Pitfalls and Avoidance Strategies

1. Inadequate Thermal Management

• Pitfall: Excessive heat due to high switching frequencies or poor PCB layout reduces reliability.
• Solution: Use a low-Rθ heatsink, optimize copper pour for MOSFETs, and ensure proper airflow.

2. Improper Loop Compensation

• Pitfall: Unstable PFC output voltage due to poorly tuned feedback loops.
• Solution: Follow ON Semiconductor’s compensation guidelines, using Type-2 or Type-3 compensators for stability.

3. EMI Compliance Failures

• Pitfall: High-frequency noise from CrM operation exceeding regulatory limits.
• Solution: Implement proper filtering (X/Y capacitors, common-mode chokes) and optimize gate drive resistors.

4. Inrush Current Stress

• Pitfall: High startup currents damaging input capacitors or rectifiers.
• Solution: Integrate soft-start circuits and current-limiting resistors.

## Key Technical Considerations for Implementation

• Input Voltage Range: Ensure the design accommodates 85–265 VAC for universal compatibility.
• Gate Drive Strength: Verify MOSFET selection matches the IC’s 1.5A peak gate drive capability.
• Current Sensing: Use a low-inductance shunt resistor (<100 mΩ) for accurate cycle-by-cycle current limiting.
• Protection Features: Leverage built-in OVP, UVLO, and brownout protection for robust operation.

By addressing these factors, designers can maximize efficiency, reliability, and compliance in NCP1654BD65R2G-based PFC stages.