Overview
The UCC2818A-Q1 is a BiCMOS average current mode boost controller designed by Texas Instruments for high-power-factor, high-efficiency preregulator power supplies. This device is particularly suited for automotive applications due to its robust features and compliance with automotive standards. It operates in a wide frequency range of 6 kHz to 220 kHz and is capable of maintaining near-unity power factor by shaping the AC input line current waveform to correspond to the AC input line voltage.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 10 | - | 17 | V |
| Supply Current (ICC) | - | 2-4 | 6 | mA |
| Gate Drive Current (Continuous) | - | - | 0.2 | A |
| Gate Drive Current (Peak) | - | - | 1.2 | A |
| UVLO Turn-On Threshold | 9.7 | 10.2 | 10.9 | V |
| UVLO Turn-Off Threshold | 9.4 | 9.7 | - | V |
| UVLO Hysteresis | 0.3 | 0.5 | - | V |
| Operating Frequency Range | 6 | - | 220 | kHz |
| Junction Temperature (TJ) | -40 | - | 150 | °C |
| Storage Temperature Range (Tstg) | -65 | - | 150 | °C |
Key Features
- Qualified for Automotive Applications
- Controls Boost Preregulator to Near-Unity Power Factor
- Limits Line Distortion
- World-Wide Line Operation
- Overvoltage Protection
- Accurate Power Limiting
- Average Current Mode Control
- Improved Noise Immunity
- Improved Feed-Forward Line Regulation
- Leading Edge Modulation
- Low Start-Up Current (150 μA typical)
- Low-Power BiCMOS Operation
- 12-V to 17-V Operation
Applications
The UCC2818A-Q1 is designed for use in high-power-factor, high-efficiency preregulator power supplies. It is particularly suitable for automotive applications due to its robust features and compliance with automotive standards. The device can be used in various power supply designs where active power-factor correction is required, ensuring that the input current waveform follows the line voltage, thus minimizing harmonic distortion and improving overall efficiency.
Q & A
- What is the primary function of the UCC2818A-Q1?
The UCC2818A-Q1 is a BiCMOS average current mode boost controller designed to achieve near-unity power factor in high-efficiency preregulator power supplies. - What is the operating frequency range of the UCC2818A-Q1?
The device operates in a frequency range of 6 kHz to 220 kHz. - What are the key features of the UCC2818A-Q1?
Key features include near-unity power factor control, line distortion limitation, overvoltage protection, accurate power limiting, average current mode control, improved noise immunity, and leading-edge modulation. - Is the UCC2818A-Q1 suitable for automotive applications?
Yes, the UCC2818A-Q1 is qualified for automotive applications. - What is the typical start-up current of the UCC2818A-Q1?
The typical start-up current is 150 μA. - What is the supply voltage range for the UCC2818A-Q1?
The supply voltage range is from 10 V to 17 V. - How does the UCC2818A-Q1 improve power supply efficiency?
The device improves efficiency by shaping the AC input line current waveform to correspond to the AC input line voltage, thus achieving near-unity power factor and reducing harmonic distortion. - What type of package is the UCC2818A-Q1 available in?
The UCC2818A-Q1 is available in a 16-pin SOIC package. - What are the thermal specifications of the UCC2818A-Q1?
The junction temperature range is from -40°C to 150°C, and the storage temperature range is from -65°C to 150°C. - How does the UCC2818A-Q1 handle overvoltage protection?
The device includes overvoltage protection and a shunt UVLO detect circuitry to ensure safe operation under various conditions.
