Overview
The NCP1622BCCSNT1G, produced by onsemi, is an enhanced, high-efficiency power factor controller designed to drive Power Factor Correction (PFC) boost stages. This 6-pin controller utilizes the innovative Valley Synchronized Frequency Fold-back (VSFF) method, which maximizes efficiency at both nominal and light load conditions. It operates in Critical Conduction Mode (CrM) and transitions to lower frequencies at low current levels, reducing standby losses to a minimum. The NCP1622BCCSNT1G is housed in a TSOP6 package and incorporates various safety and performance features, making it suitable for robust and compact PFC stages with minimal external components.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| VCC Range | 9.5 to 30 | V |
| Maximum Junction Temperature | 150 | °C |
| Operating Junction Temperature Range | -40 to +125 | °C |
| Storage Temperature Range | -65 to 150 | °C |
| Maximum Power Dissipation @ TA = 70°C | 550 | mW |
| Thermal Resistance Junction to Air | 145 | °C/W |
| Driver Current | -500 to +800 | mA |
| Feedback Voltage Reference | 2.44 to 2.56 | V |
| Maximum On Time (CrM) | 2.49 to 4.59 | μs |
Key Features
- Near-Unity Power Factor: Ensures high power factor ratios even at reduced switching frequencies.
- Critical Conduction Mode (CrM): Operates in CrM when Vctrl exceeds a programmable value.
- Valley Synchronized Frequency Fold-back (VSFF): Reduces frequency to about 30 kHz at low current levels, maximizing efficiency and minimizing standby losses.
- Skip Mode: Activates at very low load current (versions B** and D**).
- Fast Line / Load Transient Compensation: Enhances dynamic response to maintain regulation during abrupt changes in load or input voltage.
- High Drive Capability: -500 mA / +800 mA gate driver for efficient MOSFET control.
- Safety Features: Includes thermal shutdown, over-voltage protection, brown-out detection, and over-current limitation.
- Low Start-up Consumption: Low VCC start-up level (10.5 V for C version, 17.0 V for A version).
- Soft-Start: Smooth start-up operation (C version).
Applications
- PC Power Supplies
- Lighting Ballasts (LED, Fluorescent)
- Flat TV
- All Off-Line Appliances Requiring Power Factor Correction
Q & A
- What is the primary function of the NCP1622BCCSNT1G?
The NCP1622BCCSNT1G is designed to drive Power Factor Correction (PFC) boost stages, optimizing efficiency and power factor.
- What is the Valley Synchronized Frequency Fold-back (VSFF) method?
The VSFF method reduces the switching frequency to about 30 kHz at low current levels, maximizing efficiency and minimizing standby losses.
- What are the key safety features of the NCP1622BCCSNT1G?
The device includes thermal shutdown, over-voltage protection, brown-out detection, and over-current limitation.
- What is the operating junction temperature range of the NCP1622BCCSNT1G?
The operating junction temperature range is -40°C to +125°C.
- What is the maximum power dissipation at TA = 70°C?
The maximum power dissipation is 550 mW.
- What are the typical applications of the NCP1622BCCSNT1G?
Typical applications include PC power supplies, lighting ballasts, flat TVs, and all off-line appliances requiring power factor correction.
- What is the VCC range for the NCP1622BCCSNT1G?
The VCC range is from 9.5 V to 30 V.
- Does the NCP1622BCCSNT1G have a soft-start feature?
Yes, the C version of the NCP1622BCCSNT1G includes a soft-start feature for smooth start-up operation.
- What is the maximum junction temperature for the NCP1622BCCSNT1G?
The maximum junction temperature is 150°C.
- How does the NCP1622BCCSNT1G handle line and load transients?
The device includes fast line and load transient compensation to maintain regulation during abrupt changes in load or input voltage.
