Overview
The UCC28070PWR, produced by Texas Instruments, is an advanced power factor correction (PFC) controller designed for high-efficiency and high-power applications. This device integrates two pulse-width modulators (PWMs) operating 180° out of phase, enabling interleaved continuous conduction mode (CCM) operation. This interleaved PWM operation significantly reduces input and output ripple currents, making conducted-EMI filtering easier and less expensive. The UCC28070PWR features advanced current synthesis and quantized voltage feed-forward, enhancing performance in power factor, efficiency, total harmonic distortion (THD), and transient response.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | SOIC (20), TSSOP (20) |
| Package Size | SOIC: 12.80 mm × 7.50 mm, TSSOP: 6.50 mm × 4.40 mm |
| Operating Frequency | 30 kHz to 300 kHz |
| Frequency-Dithering Rate and Magnitude | Rate: Up to 30 kHz, Magnitude: 3 kHz to 30 kHz |
| Maximum Duty-Cycle Clamp | Programmable |
| Peak Current Limiting | Programmable |
| Protection Features | Bias-Supply UVLO, Overvoltage Protection, Open-Loop Detection, PFC-Enable Monitoring, External PFC-Disable Interface, Open-Circuit Protection on VSENSE and VINAC pins |
| Soft-Start | Programmable |
Key Features
- 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
- Programmable Frequency from 30 kHz to 300 kHz
- Programmable Frequency-Dithering Rate and Magnitude for Enhanced EMI Reduction
- External-Clock Synchronization Capability
- Enhanced Load and Line Transient Response through Voltage Amplifier Output Slew-Rate Correction
- 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
- High-Efficiency Server and Desktop Power Supplies
- Telecom Rectifiers
- White Goods and Industrial Equipment
Q & A
- What is the primary function of the UCC28070PWR? The UCC28070PWR is a power factor correction (PFC) controller designed for high-efficiency and high-power applications.
- What type of PWM operation does the UCC28070PWR support? The UCC28070PWR supports interleaved continuous conduction mode (CCM) PWM operation.
- What are the key benefits of the interleaved PWM operation? The interleaved PWM operation reduces input and output ripple currents, making conducted-EMI filtering easier and less expensive.
- What is the operating frequency range of the UCC28070PWR? The operating frequency range is from 30 kHz to 300 kHz.
- Does the UCC28070PWR support frequency dithering? Yes, it supports programmable frequency-dithering rate and magnitude for enhanced EMI reduction.
- What protection features are included in the UCC28070PWR? The device includes bias-supply UVLO, overvoltage protection, open-loop detection, PFC-enable monitoring, external PFC-disable interface, and open-circuit protection on VSENSE and VINAC pins.
- Can the UCC28070PWR be synchronized with an external clock? Yes, it has an external-clock synchronization capability.
- What types of applications is the UCC28070PWR suited for? It is suited for high-efficiency server and desktop power supplies, telecom rectifiers, white goods, and industrial equipment.
- Is the soft-start feature programmable in the UCC28070PWR? Yes, the soft-start feature is programmable.
- What are the package options available for the UCC28070PWR? The device is available in SOIC (20) and TSSOP (20) packages.
