Overview
The UCC2818DW is a 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, utilizing average current mode control to maintain stable, low distortion sinusoidal line current. The UCC2818DW is fabricated using Texas Instruments’ BiCMOS process, offering features such as lower start-up current, lower power dissipation, overvoltage protection, and improved noise immunity.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (DW) | - |
| Pins | 16 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Frequency Range | 6 kHz to 220 kHz | - |
| UVLO (Under-Voltage Lockout) Thresholds | 10.5 V (turn-on), 10 V (turn-off) | V |
| Start-Up Current | 150 µA (typical) | A |
| Maximum Operating Voltage | Up to 18 V | V |
| Gate Drive Current | 0.2 A (continuous), 1.2 A (peak) | A |
| Junction Temperature | -55 to 150 | °C |
| Storage Temperature | -65 to 150 | °C |
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
- 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 UCC2818DW?
The primary function of the UCC2818DW is to control boost preregulators to achieve near-unity power factor correction.
- What is the operating temperature range of the UCC2818DW?
The operating temperature range of the UCC2818DW is -40°C to 85°C.
- What is the frequency range of the UCC2818DW?
The frequency range of the UCC2818DW is 6 kHz to 220 kHz.
- What type of package does the UCC2818DW come in?
The UCC2818DW comes in a SOIC (DW) package with 16 pins.
- What is the typical start-up current of the UCC2818DW?
The typical start-up current of the UCC2818DW is 150 µA.
- Does the UCC2818DW have overvoltage protection?
Yes, the UCC2818DW has overvoltage protection (OVP) to protect against excessive output voltage.
- What are some of the key applications for the UCC2818DW?
The UCC2818DW is used in PC power supplies, consumer electronics, lighting systems, industrial power supplies, and IEC6100-3-2 compliant supplies less than 300 W.
- How does the UCC2818DW reduce ripple current in the bulk capacitor?
The UCC2818DW uses a leading-edge modulation technique to reduce ripple current in the bulk capacitor.
- What is the maximum operating voltage of the UCC2818DW?
The maximum operating voltage of the UCC2818DW is up to 18 V.
- Does the UCC2818DW support worldwide line operation?
Yes, the UCC2818DW supports worldwide line operation.
