Overview
The UCC2818DTR is a BiCMOS power factor correction (PFC) controller produced by Texas Instruments. It is part of the UCCx817 and UCCx818 family, designed to provide all the necessary functions for active power factor-corrected preregulators. This controller achieves near-unity power factor by shaping the AC input line current waveform to correspond to that of the AC input line voltage, using average current mode control to maintain stable, low distortion sinusoidal line current.
Designed in Texas Instruments’ BiCMOS process, the UCC2818DTR offers features such as lower start-up current, lower power dissipation, overvoltage protection, and improved noise immunity. It is suitable for a wide range of applications requiring high power factor and low line distortion.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 16 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Frequency Range | 6 kHz to 220 kHz | - |
| VCC Turn-On Threshold | 9.7 to 10.8 | V |
| VCC Turn-Off Threshold | 9.4 to 9.7 | V |
| UVLO Hysteresis | 0.3 to 0.5 | V |
| Typical Start-Up Current | 150 µA | - |
| Maximum Operating Voltage | Up to 18 V | - |
Key Features
- Controls Boost Preregulator to Near-Unity Power Factor
- Limits Line Distortion
- World Wide Line Operation
- Over-Voltage Protection
- Accurate Power Limiting
- Average Current Mode Control
- Improved Noise Immunity
- Improved Feed-Forward Line Regulation
- Leading Edge Modulation to reduce ripple current in the bulk capacitor
- Low-Power BiCMOS Operation
- Typical Start-Up Current of 150 µA
- Up to 18-V Operation
Applications
- PC Power Supplies
- Consumer Electronics
- Lighting Systems
- Industrial Power Supplies
- IEC6100-3-2 Compliant Supplies (Less than 300 W)
Q & A
- What is the primary function of the UCC2818DTR?
The UCC2818DTR is a BiCMOS power factor correction (PFC) controller designed to achieve near-unity power factor by shaping the AC input line current waveform to correspond to that of the AC input line voltage.
- What is the operating temperature range of the UCC2818DTR?
The operating temperature range is -40°C to 85°C.
- What is the frequency range of the UCC2818DTR?
The frequency range is 6 kHz to 220 kHz.
- What type of package does the UCC2818DTR come in?
The UCC2818DTR comes in a SOIC (D) package with 16 pins.
- Does the UCC2818DTR have overvoltage protection?
Yes, the UCC2818DTR includes overvoltage protection.
- What is the typical start-up current of the UCC2818DTR?
The typical start-up current is 150 µA.
- What is the maximum operating voltage of the UCC2818DTR?
The maximum operating voltage is up to 18 V.
- What are some of the key applications for the UCC2818DTR?
Key applications include PC power supplies, consumer electronics, lighting systems, industrial power supplies, and IEC6100-3-2 compliant supplies (less than 300 W).
- Does the UCC2818DTR support worldwide line operation?
Yes, the UCC2818DTR supports worldwide line operation.
- How does the UCC2818DTR reduce ripple current in the bulk capacitor?
The UCC2818DTR uses a leading-edge modulation technique to reduce ripple current in the bulk capacitor.
- What is the significance of the BiCMOS process in the UCC2818DTR?
The BiCMOS process in the UCC2818DTR offers lower start-up current, lower power dissipation, and improved noise immunity.
