Overview
The NCP1611BDR2G, produced by onsemi, is an enhanced, high-efficiency power factor controller designed to drive PFC (Power Factor Correction) boost stages. It employs an innovative Current Controlled Frequency Fold-back (CCFF) method, which maximizes efficiency at both nominal and light load conditions. This controller operates in Critical Conduction Mode (CrM) and incorporates features such as on-time modulation, skip mode near the line zero crossing, and fast line/load transient compensation. The NCP1611BDR2G is housed in a SOIC-8 package and is suitable for robust and compact PFC stages with minimal external components.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC (Power Supply Input) | -0.3 | - | 35 | V |
| VCC Start-Up Threshold (A Version) | 9.75 | 10.50 | 11.25 | V |
| VCC Start-Up Threshold (B Version) | 15.80 | 17.00 | 18.20 | V |
| VCC Minimum Operating Voltage | 8.50 | 9.00 | 9.50 | V |
| DRV Pin Drive Capability | -500 | - | 800 | mA |
| Operating Junction Temperature Range | -40 | - | 125 | °C |
| Thermal Shutdown Threshold | - | - | 150 | °C |
Key Features
- Near-Unity Power Factor: Ensures high power factor ratios across a wide range of line and load conditions.
- Critical Conduction Mode (CrM): Operates in CrM when the inductor current exceeds a programmable value.
- Current Controlled Frequency Fold-back (CCFF): Reduces frequency to about 20 kHz at low current levels, minimizing standby losses.
- On-time Modulation: Maintains proper current shaping in CCFF mode.
- Skip Mode Near the Line Zero Crossing: Enhances efficiency during light load conditions.
- Fast Line/Load Transient Compensation (Dynamic Response Enhancer): Improves response to line and load changes.
- Valley Turn On: Reduces switching losses.
- High Drive Capability: Up to 500 mA sink and 800 mA source current.
- Low Start-Up Consumption: Minimizes power consumption during start-up.
- Safety Features: Includes over-voltage protection, brown-out detection, soft-start, over-current limitation, and thermal shutdown.
Applications
- PC, TV, and Adapter Power Supplies
- LED Drivers and Light Ballasts (including dimmable versions)
- All Off-Line Applications Requiring Power Factor Correction
Q & A
- What is the primary function of the NCP1611BDR2G?
The NCP1611BDR2G is designed to drive PFC boost stages, ensuring high power factor correction and efficiency.
- What is the Current Controlled Frequency Fold-back (CCFF) method?
The CCFF method reduces the switching frequency to about 20 kHz at low current levels, minimizing standby losses and maximizing efficiency.
- What are the key safety features of the NCP1611BDR2G?
The key safety features include over-voltage protection, brown-out detection, soft-start, over-current limitation, and thermal shutdown.
- What is the operating junction temperature range of the NCP1611BDR2G?
The operating junction temperature range is from -40°C to 125°C.
- What is the typical application of the NCP1611BDR2G in power supplies?
The NCP1611BDR2G is typically used in PC, TV, and adapter power supplies, as well as in LED drivers and light ballasts.
- How does the NCP1611BDR2G handle line and load transients?
The NCP1611BDR2G features fast line/load transient compensation, known as the Dynamic Response Enhancer, to improve response to line and load changes.
- What is the drive capability of the DRV pin?
The DRV pin has a drive capability of up to 500 mA sink and 800 mA source current.
- What is the thermal shutdown threshold of the NCP1611BDR2G?
The thermal shutdown threshold is 150°C.
- How does the NCP1611BDR2G ensure near-unity power factor?
The NCP1611BDR2G ensures near-unity power factor through its advanced control algorithms and internal circuitry, even when the switching frequency is reduced.
- What package type is the NCP1611BDR2G available in?
The NCP1611BDR2G is housed in a SOIC-8 package.
