Overview
The UCC28514DWR is a advanced Power Factor Correction (PFC) and Pulse Width Modulation (PWM) combination controller produced by Texas Instruments. This device is designed to provide complete control functionality for off-line power systems, ensuring compliance with IEC1000-3-2 harmonic reduction requirements. By integrating the control and drive signals for both PFC and PWM stages into a single device, it offers significant performance and cost benefits. The UCC28514DWR features leading-edge modulation for the PFC stage and trailing-edge modulation for the PWM stage, which helps minimize ripple current in the boost output capacitor.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Supply Voltage | 9.7 | 12 | 18 | V |
| Operating Temperature | -40 | 105 | °C | |
| Switching Frequency | 200 kHz | kHz | ||
| Package Type | 20-SOIC (0.295", 7.50mm Width) | |||
| VCC Turn-on Threshold | 15.4 | 16 | 16.6 | V |
| VCC Turn-off Threshold | 9.1 | 9.7 | 10.6 | V |
| UVLO Hysteresis | 5.8 | 6.3 | 6.8 | V |
| Maximum Duty Cycle | 70% | 75% | 80% | % |
| Minimum Controllable Pulse Width | 120 | 150 | 200 | ns |
Key Features
- Average current mode control architecture with input voltage feedforward for improved performance.
- Leading-edge modulation for the PFC stage and trailing-edge modulation for the PWM stage to minimize ripple current in the boost output capacitor.
- Programmable maximum duty cycle and 2x PWM frequency options relative to the base PFC frequency.
- Improved multiplier and transconductance amplifier for enhanced transient response in the PFC stage.
- Low-offset, high-bandwidth current error amplifier and voltage amplifier for precise control.
- Undervoltage lockout (UVLO) circuit with selectable hysteresis levels.
- Accurate reference voltage, zero power detect, OVP/enable, peak current limit, and power limiting features.
- High-current output gate drivers for both PFC and PWM stages.
- Soft-start capability and pulse-by-pulse current sensing in the PWM stage.
Applications
The UCC28514DWR is suitable for various off-line power systems that require high power factor correction and efficient PWM control. These include:
- Switch-mode power supplies (SMPS) for consumer electronics and industrial equipment.
- Power supplies for lighting systems, especially those requiring high power factor and efficiency.
- Motor control systems where precise current control and high power factor are necessary.
- Renewable energy systems, such as solar and wind power inverters, to ensure compliance with grid standards.
Q & A
- What is the primary function of the UCC28514DWR?
The UCC28514DWR is a combination controller for Power Factor Correction (PFC) and Pulse Width Modulation (PWM) in off-line power systems.
- What are the key benefits of using the UCC28514DWR?
The device offers significant performance and cost benefits by integrating PFC and PWM control into a single device, minimizing ripple current, and providing improved transient response.
- What is the operating temperature range of the UCC28514DWR?
The operating temperature range is from -40°C to 105°C.
- What is the typical switching frequency of the UCC28514DWR?
The typical switching frequency is 200 kHz.
- What package type is the UCC28514DWR available in?
The device is available in a 20-SOIC package.
- What are the VCC turn-on and turn-off thresholds for the UCC28514DWR?
The VCC turn-on threshold is between 15.4V and 16.6V, and the turn-off threshold is between 9.1V and 10.6V.
- Does the UCC28514DWR support programmable maximum duty cycle?
Yes, the device supports programmable maximum duty cycle and 2x PWM frequency options.
- What are some of the protection features of the UCC28514DWR?
The device includes features such as undervoltage lockout (UVLO), overvoltage protection, peak current limit, and power limiting.
- Is the UCC28514DWR suitable for renewable energy systems?
Yes, it is suitable for renewable energy systems, such as solar and wind power inverters, to ensure compliance with grid standards.
- What is the purpose of the soft-start capability in the UCC28514DWR?
The soft-start capability helps in gradually increasing the output voltage during startup, preventing inrush currents and ensuring smooth operation.
