Overview
The UCC2818DTRG4, produced by Texas Instruments, is a BiCMOS power factor preregulator controller designed to achieve near-unity power factor in power supply systems. This device is part of the UCCx817 and UCCx818 family, which offers advanced features such as lower start-up current, lower power dissipation, and improved noise immunity. The UCC2818 is particularly suited for applications requiring a wide operating temperature range, from -40°C to 85°C, making it versatile for various industrial and consumer electronics uses.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Current (Off) | 150 | 300 | - | µA |
| Supply Current (On) | 2 | 4 | 6 | mA |
| VCC Turn-On Threshold (UCC2818) | 9.7 | 10.2 | 10.8 | V |
| VCC Turn-Off Threshold (UCC2818) | 9.4 | 9.7 | - | V |
| UVLO Hysteresis (UCC2818) | 0.3 | 0.5 | - | V |
| Oscillator Frequency Range | 6 kHz | - | 220 kHz | - |
| Maximum Duty Cycle | 93% | 95% | 99% | - |
| Output Rise Time | 25 ns | 50 ns | - | - |
| Output Fall Time | 10 ns | 50 ns | - | - |
Key Features
- Controls boost preregulator to near-unity power factor
- Limits line distortion
- Worldwide 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
- Low start-up current (150 μA typical)
Applications
- PC Power Supplies
- Consumer Electronics
- Lighting Systems
- Industrial Power Supplies
- IEC61000-3-2 Compliant Supplies (Less than 300 W)
Q & A
- What is the primary function of the UCC2818DTRG4?
The primary function of the UCC2818DTRG4 is to control the boost preregulator to achieve near-unity power factor in power supply systems.
- What is the operating temperature range of the UCC2818DTRG4?
The UCC2818DTRG4 operates over a temperature range of -40°C to 85°C.
- What is the typical start-up current of the UCC2818DTRG4?
The typical start-up current of the UCC2818DTRG4 is 150 μA.
- What type of control mode does the UCC2818DTRG4 use?
The UCC2818DTRG4 uses average current mode control to maintain stable, low-distortion sinusoidal line current.
- Does the UCC2818DTRG4 have over-voltage protection?
Yes, the UCC2818DTRG4 features over-voltage protection that stops switching when the output voltage exceeds the OVP threshold.
- What is the purpose of the leading edge modulation in the UCC2818DTRG4?
The leading edge modulation in the UCC2818DTRG4 reduces the ripple current in the bulk capacitor, thereby increasing the overall lifetime of the power supply.
- What are the typical output rise and fall times of the UCC2818DTRG4?
The typical output rise time is 50 ns, and the typical output fall time is 50 ns.
- What is the maximum duty cycle of the UCC2818DTRG4?
The maximum duty cycle of the UCC2818DTRG4 is up to 99%.
- What are some common applications of the UCC2818DTRG4?
Common applications include PC power supplies, consumer electronics, lighting systems, industrial power supplies, and IEC61000-3-2 compliant supplies.
- How does the UCC2818DTRG4 improve noise immunity?
The UCC2818DTRG4 improves noise immunity through its BiCMOS process and various design features such as feed-forward line regulation and a low-offset current amplifier.
