Overview
The NCP1654BD133R2G is a controller designed for Continuous Conduction Mode (CCM) Power Factor Correction (PFC) step-up preconverters, manufactured by onsemi. This device is optimized for applications requiring high power factor, reliability, and cost-effectiveness. It operates in a fixed frequency mode, which simplifies compliance with EMI standards and reduces radiated noise. The NCP1654 is housed in a compact SO8 package, minimizing the number of external components needed and simplifying the PFC stage design.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Switching Frequency | 120 kHz ~ 146 kHz | kHz |
| Power Supply Voltage (VCC) | 9 V to 20 V | V |
| Output Drive Capability | ±1.5 A | A |
| Operating Junction Temperature Range | -40°C to +125°C | °C |
| Thermal Shutdown Threshold | 150°C | °C |
| Overcurrent Protection Threshold | 185 ~ 215 µA | µA |
| Startup Current | < 75 µA | µA |
| Shutdown Current | < 400 µA | µA |
Key Features
- IEC61000-3-2 Compliance: Ensures compliance with international power factor correction standards.
- Average Current Continuous Conduction Mode: Operates in average current mode for precise control.
- Fast Transient Response: Enhances the regulation loop to handle abrupt load or input voltage variations.
- Very Few External Components: Simplifies the PFC stage design by minimizing the number of external components required.
- Low Startup and Shutdown Currents: Reduces power losses during startup and shutdown phases.
- High Safety Protection Features: Includes overvoltage protection, coil current limitation, thermal shutdown, and brown-out detection.
- Soft-Start Capability: Gradually increases the duty cycle to reduce stress on the MOSFET during startup.
- Accurate Fully Integrated Oscillator: Provides switching frequencies of 65 kHz, 133 kHz, or 200 kHz.
- Internally Trimmed Internal Reference: Ensures stable and accurate operation.
Applications
- Flat TVs and PC Desktops: Ideal for power supplies in consumer electronics.
- AC Adapters: Suitable for high-efficiency power adapters.
- White Goods and Other Offline SMPS: Used in various offline switch-mode power supplies.
Q & A
- What is the primary function of the NCP1654BD133R2G?
The NCP1654BD133R2G is a controller for Continuous Conduction Mode (CCM) Power Factor Correction (PFC) step-up preconverters.
- What are the available switching frequencies for the NCP1654?
The NCP1654 operates at switching frequencies of 65 kHz, 133 kHz, or 200 kHz.
- What is the typical operating voltage range for the VCC pin?
The VCC pin operates within a voltage range of 9 V to 20 V.
- What safety features are integrated into the NCP1654?
The device includes overvoltage protection, coil current limitation, thermal shutdown, brown-out detection, and undervoltage protection.
- How does the NCP1654 handle startup and shutdown phases?
The device features a soft-start capability and very low startup and shutdown currents to minimize power losses.
- What is the significance of the SO8 package?
The SO8 package minimizes the number of external components needed and simplifies the PFC stage design.
- What are some typical applications for the NCP1654?
It is used in flat TVs, PC desktops, AC adapters, white goods, and other offline switch-mode power supplies.
- How does the NCP1654 handle transient responses?
The device enhances the regulation loop to handle abrupt load or input voltage variations through its fast transient response feature.
- What is the role of the totem pole gate drive in the NCP1654?
The ±1.5 A totem pole gate drive efficiently drives high gate charge power MOSFETs.
- How does the NCP1654 protect against overcurrent and overpower conditions?
The device includes overcurrent protection and overpower limitation features to protect the system from excessive stress.
