Overview
The UCC28070APWR is a Power Factor Correction (PFC) controller IC designed by Texas Instruments for use in power supply applications. This controller is renowned for its high efficiency and power factor correction capabilities, making it suitable for a wide range of power management systems. It integrates two pulse-width modulators (PWMs) operating 180° out of phase, which helps in reducing input and output ripple currents and simplifies conducted EMI filtering.
Key Specifications
| Topology | Boost |
|---|---|
| Switching frequency (max) (kHz) | 300 |
| UVLO thresholds on/off (V) | 10.2/9.2 |
| Vin (max) (V) | 21 |
| Rating | Catalog |
| Operating temperature range (°C) | -40 to 125 |
| Duty cycle (max) (%) | 99 |
| Control mode | CCM |
| Package/Case | TSSOP-20 |
Key Features
- High efficiency power factor correction controller
- Wide voltage range of operation
- Adaptive on-time control to optimize efficiency
- Light load efficiency improvement
- Supports burst mode operation
- Integrated high voltage startup
- Protection features including overcurrent and overvoltage protection
- Interleaved average current-mode PWM control with inherent current matching
- Advanced current-synthesizer current sensing for superior efficiency
- Highly-linear multiplier output with internal quantized voltage feed-forward correction for near-unity PF
- Extended range programmable frequency (10kHz to 300kHz)
- Programmable maximum duty-cycle clamp
- Programmable frequency dithering rate and magnitude for enhanced EMI reduction
- External clock synchronization capability
- Enhanced load and line transient response through slew-rate correction of voltage amplifier output current
- Programmable peak current limiting
- Bias-supply UVLO, overvoltage protection, open-loop detection, and PFC-enable monitoring
- External PFC-disable interface
- Open-circuit protection on VSENSE and VINAC pins
- Programmable soft-start
Applications
The UCC28070APWR is primarily used in power supply applications such as AC-DC converters and power factor correction circuits. It is commonly found in consumer electronics, LED lighting, industrial power supplies, and battery chargers. The device is also suitable for high-efficiency server and desktop power supplies, telecom rectifiers, and various industrial equipment.
Q & A
- Q: What is power factor correction and why is it important?
A: Power factor correction is a technique used to improve power efficiency by adjusting the power factor towards unity. This helps reduce reactive power consumption and improve system efficiency.
- Q: Can the UCC28070APWR be used in high-power applications?
A: Yes, the UCC28070APWR is designed to handle high-power applications with efficient power factor correction capabilities.
- Q: What is the operating temperature range of the UCC28070APWR?
A: The operating temperature range of the UCC28070APWR is -40°C to 125°C.
- Q: What is the maximum switching frequency of the UCC28070APWR?
A: The maximum switching frequency of the UCC28070APWR is 300 kHz.
- Q: Does the UCC28070APWR support interleaved operation?
A: Yes, the UCC28070APWR supports interleaved average current-mode PWM control with inherent current matching.
- Q: What protection features are included in the UCC28070APWR?
A: The UCC28070APWR includes protection features such as overcurrent and overvoltage protection, bias-supply UVLO, open-loop detection, and PFC-enable monitoring.
- Q: Can the UCC28070APWR be synchronized with an external clock?
A: Yes, the UCC28070APWR has an external clock synchronization capability.
- Q: What is the package type of the UCC28070APWR?
A: The UCC28070APWR is packaged in a TSSOP-20 package.
- Q: Does the UCC28070APWR support programmable frequency dithering?
A: Yes, the UCC28070APWR supports programmable frequency dithering rate and magnitude for enhanced EMI reduction.
- Q: What are some common applications of the UCC28070APWR?
A: The UCC28070APWR is commonly used in consumer electronics, LED lighting, industrial power supplies, battery chargers, and high-efficiency server and desktop power supplies.
