Overview
The NCP1611ADR2G is an active power factor corrected (PFC) controller designed by ON Semiconductor. It is specifically intended for use as a boost preconverter in various applications such as ac-dc adapters, flat TVs, lighting ballasts, and other medium-powered offline systems. The controller employs an innovative Current Controlled Frequency Foldback (CCFF) method, which maximizes efficiency at both nominal and light loads, significantly reducing standby losses. It operates in Critical Conduction Mode (CrM) and incorporates a robust suite of protection features to handle various power supply operating and fault conditions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCC Range | 9.5 - 35 | V |
| Drive Capability | -500 mA / +800 mA | mA |
| Start-Up Threshold (VCC increasing) | A Version: 10.5 V, B Version: 17 V | V |
| Minimum Operating Voltage (VCC falling) | 9.5 V | V |
| Package Type | SOIC-8 | |
| Operating Junction Temperature Range | -40 to +125 | °C |
| Thermal Shutdown Threshold | 150 | °C |
| Frequency Operation | Variable, down to about 20 kHz at low current | kHz |
Key Features
- Near Unity Power Factor
- Critical Conduction Mode (CrM) with Current Controlled Frequency Foldback (CCFF)
- Dynamic Response Enhancer
- Soft Overvoltage Protection (S-OVP)
- Valley Turn On
- AC Line Brownout Detection
- Cycle-by-cycle current protection
- Saturated Inductor and shorted boost or bypass protection
- Open Pin Protection including Ground
- Undervoltage and Fast Overvoltage protection
Applications
- Offline Power Supplies
- Lighting Ballasts
- Flat TVs
- All-in-one Computers
- High Powered Adapters
- LED Lighting Power Supplies and Drivers
- Dimmable Fluorescent Ballasts
- LED Lighting
Q & A
- What is the primary function of the NCP1611ADR2G?
The NCP1611ADR2G is an active power factor corrected (PFC) controller designed for use as a boost preconverter in ac-dc adapters, flat TVs, lighting ballasts, and other medium-powered offline applications. - What is the Current Controlled Frequency Foldback (CCFF) method?
The CCFF method is an innovative technique where the circuit operates in Critical Conduction Mode (CrM) when the inductor current exceeds a programmable value, and linearly reduces the frequency down to about 20 kHz when the current is at a null, maximizing efficiency at both nominal and light loads. - What are the key protection features of the NCP1611ADR2G?
The controller includes features such as Soft Overvoltage Protection (S-OVP), cycle-by-cycle current protection, saturated inductor and shorted boost or bypass protection, open pin protection including ground, undervoltage, and fast overvoltage protection. - What is the operating voltage range of the NCP1611ADR2G?
The VCC range is from 9.5 V to 35 V. - What are the drive capabilities of the NCP1611ADR2G?
The drive capability is -500 mA / +800 mA. - What is the package type of the NCP1611ADR2G?
The package type is SOIC-8. - What are the typical applications of the NCP1611ADR2G?
Typical applications include offline power supplies, lighting ballasts, flat TVs, all-in-one computers, high-powered adapters, LED lighting power supplies and drivers, and dimmable fluorescent ballasts. - How does the NCP1611ADR2G handle thermal issues?
The controller has a thermal shutdown threshold of 150°C and a hysteresis of 50°C. - What is the significance of the Dynamic Response Enhancer in the NCP1611ADR2G?
The Dynamic Response Enhancer provides fast line and load transient compensation, ensuring stable operation during changes in load or line conditions. - Is the NCP1611ADR2G compliant with any specific standards?
Yes, it is compliant with EN61000-3-2 Class C across a wide load range for dimmable light ballasts.
