Overview
The UCC2818DWTR, produced by Texas Instruments, is a BiCMOS power factor correction (PFC) controller designed for active power factor-corrected preregulators. This device is part of the UCCx817 and UCCx818 family, which provides all the necessary functions for achieving near-unity power factor. It shapes the AC input line current waveform to correspond to that of the AC input line voltage, ensuring stable and low distortion sinusoidal line current through average current mode control.
Designed in Texas Instruments' BiCMOS process, the UCC2818DWTR offers several key enhancements, including lower start-up current, lower power dissipation, overvoltage protection, and a leading-edge modulation technique to reduce ripple current in the bulk capacitor. It also features an improved, low-offset current amplifier to minimize distortion at light load conditions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (DW) | - |
| Pins | 16 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Frequency Range | 6 kHz to 220 kHz | - |
| Start-Up Current | 150 µA (typical) | - |
| 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 | - |
| Maximum Shunt Voltage | 17.5 V | - |
| Output Current Limit | Up to 1.2 A | - |
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
- Up to 18-V Operation
- Improved, low-offset (±2-mV) current amplifier to reduce distortion at light load conditions
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 UCC2818DWTR?
The primary function of the UCC2818DWTR is to control boost preregulators to achieve near-unity power factor in power supply systems.
- What is the operating temperature range of the UCC2818DWTR?
The operating temperature range is -40°C to 85°C.
- What is the typical start-up current of the UCC2818DWTR?
The typical start-up current is 150 µA.
- What is the frequency range of the UCC2818DWTR?
The frequency range is 6 kHz to 220 kHz.
- Does the UCC2818DWTR have overvoltage protection?
Yes, the UCC2818DWTR includes overvoltage protection.
- What type of current mode control does the UCC2818DWTR use?
The UCC2818DWTR uses average current mode control.
- What is the maximum shunt voltage for the UCC2818DWTR?
The maximum shunt voltage is 17.5 V.
- What are some common applications for the UCC2818DWTR?
Common applications include PC power supplies, consumer electronics, lighting systems, and industrial power supplies.
- Is the UCC2818DWTR compliant with IEC6100-3-2 standards?
Yes, it is compliant for supplies less than 300 W.
- What is the package type for the UCC2818DWTR?
The package type is SOIC (DW) with 16 pins.
