Overview
The NCP1622BECSNT1G is a high-efficiency Power Factor Controller (PFC) designed by ON Semiconductor. This 6-pin controller is optimized to drive PFC boost stages using the innovative Valley Synchronized Frequency Fold-back (VSFF) method. The VSFF mode allows the circuit to operate in Critical Conduction Mode (CrM) when the control voltage exceeds a programmable value, and it linearly reduces the frequency down to about 30 kHz at lower control voltages, maximizing efficiency at both nominal and light loads. The NCP1622BECSNT1G is housed in a TSOP-6 package and incorporates various protection features and a robust design to ensure reliable operation with minimal standby losses.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Package Type | TSOP-6 | - |
| Operating Junction Temperature Range | -40 to +125 | °C |
| Maximum Junction Temperature | 150 | °C |
| Storage Temperature Range | -65 to 150 | °C |
| Power Supply Input (VCC) | -0.3 to +30 | V |
| Driver Voltage (DRV) | -0.3 to +30 | V |
| Driver Current (DRV) | -500 to +800 | mA |
| Maximum Power Dissipation @ TA = 70°C | 550 | mW |
| Thermal Resistance Junction to Air | 145 | °C/W |
| Feedback Voltage Reference (VREF) | 2.44 to 2.56 | V |
| Error Amplifier Current Capability | 15 to 26 | μA |
| Error Amplifier Gain | 110 to 290 | μS |
Key Features
- Valley Synchronized Frequency Fold-back (VSFF): Operates in Critical Conduction Mode (CrM) and linearly reduces frequency down to about 30 kHz at lower control voltages, maximizing efficiency at both nominal and light loads.
- Near-Unity Power Factor: Internal circuitry ensures near-unity power factor even when the switching frequency is reduced.
- Fast Line / Load Transient Compensation: Enhances dynamic response by limiting over or under-shoot during abrupt changes in load or input voltage.
- Safety Protections: Includes Over-Voltage Protection (OVP), Under-Voltage Protection (UVP), Maximum Current Limit, Brown-Out Detection, and Thermal Shutdown.
- Output Stage Totem Pole: Incorporates a -0.5 A / +0.8 A gate driver to efficiently drive most TO220 or TO247 power MOSFETs.
- Low Standby Losses: Reduces standby losses to a minimum, making it ideal for applications requiring high efficiency and low power consumption.
Applications
The NCP1622BECSNT1G is ideal for systems where cost-effectiveness, reliability, low standby power, and high efficiency are key requirements. Typical applications include:
- Power Factor Correction (PFC) stages in power supplies.
- High-efficiency power conversion systems.
- Consumer and industrial power equipment.
- LED lighting systems and other applications requiring high power factor and efficiency.
Q & A
- What is the primary function of the NCP1622BECSNT1G?
The NCP1622BECSNT1G is designed to drive Power Factor Correction (PFC) boost stages, optimizing efficiency across the load range.
- What is the Valley Synchronized Frequency Fold-back (VSFF) method?
The VSFF method allows the circuit to operate in Critical Conduction Mode (CrM) and linearly reduce the frequency down to about 30 kHz at lower control voltages, maximizing efficiency.
- What are the key safety protections included in the NCP1622BECSNT1G?
The controller includes Over-Voltage Protection (OVP), Under-Voltage Protection (UVP), Maximum Current Limit, Brown-Out Detection, and Thermal Shutdown.
- What is the operating junction temperature range of the NCP1622BECSNT1G?
The operating junction temperature range is -40°C to +125°C.
- What is the maximum power dissipation of the NCP1622BECSNT1G at TA = 70°C?
The maximum power dissipation is 550 mW.
- What is the feedback voltage reference (VREF) of the NCP1622BECSNT1G?
The feedback voltage reference (VREF) is between 2.44 V and 2.56 V.
- How does the NCP1622BECSNT1G handle fast line and load transients?
The controller enhances dynamic response by limiting over or under-shoot during abrupt changes in load or input voltage.
- What type of package does the NCP1622BECSNT1G come in?
The NCP1622BECSNT1G is housed in a TSOP-6 package.
- What is the typical application of the NCP1622BECSNT1G?
Typical applications include PFC stages in power supplies, high-efficiency power conversion systems, and consumer and industrial power equipment.
- How does the NCP1622BECSNT1G reduce standby losses?
The VSFF method and other internal circuitries reduce standby losses to a minimum, making it ideal for applications requiring high efficiency and low power consumption.
